Technical Information

Load Sensing Steering UnitsOSPB/C/F/D/L LS, OLS Priority Valves,
OSQ Flow Amplifiers

www.danfoss.com

Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers

Revision history

2 | © Danfoss | April 2021

Table of revisions
Date

ChangedRev

April 2021

Changed document number from 'BC00000009' and '11007611' to 'BC152886483962'

1003

October 2019

Data and image revisions throughout

0901

August 2018

Fixed typo, and updated OLS 160 dimension drawing.

0801

June 2017

Overview regarding steering components; Literature reference table: Technical data
chapter; Port thread versions; Dimensions for OSPC/OSPF 230; Specification table for non
catalogue numbers of Danfoss Priority Valves; and Flow and pressure table

0701

July 2016

Updated text under OSPD LS: Steering unit load sensing dynamic with 2 rotary meters andwith integrated valve functions

0601

April 2016

Updated to Engineering Tomorrow design0503

February 2016

Update image OSPC LS/LSR and OSPF LS for OLS, OSPCX LS for OSQ

0502

September 2014 Various updates

EA

February 2014

Converted to Danfoss layout - DITA CMSDAAugust 2013

OSPQ deleted

CA

November 2009 Steering column deleted

BA

May 2006

AA

First version

BC152886483962en-001003

Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow AmplifiersContents
A wide range of steering components
Conversion factors........................................................................................................................................................................... 6
Survey of literature on Danfoss steering components....................................................................................................... 6
LS Steering Units OSPB, OSPC, OSPF, OSPD, OSPL
Versions................................................................................................................................................................................................7
OSPB LS: Steering unit with no valve functions............................................................................................................... 8OSPC LS: Steering unit load sensing with integrated valve functions for in line priority valve OLS............ 9OSPC LS: Steering unit load sensing with integrated valve functions for flange on priority valve
OLSA.........................................................................................................................................................................................9OSPC LSR: Steering unit load sensing dynamic with integrated valve functions............................................. 10
OSPF LS : Steering unit full drain load sensing dynamic and with integrated valve functions....................10
OSPD LS: Steering unit load sensing dynamic with 2 rotary meters and with integrated valvefunctions.............................................................................................................................................................................. 11
OSPL LS:........................................................................................................................................................................................12OSPBX LS, OSPCX LS and OSPLX LS: Steering units load sensing for flow amplifiers......................................14
Code numbers and weights.......................................................................................................................................................15
OSPB load sensing static non-reaction steering units................................................................................................ 15
OSPB load sensing dynamic non-reaction steering units..........................................................................................15
OSPC load sensing static non-reaction steering unit.................................................................................................. 16
OSPC load sensing dynamic non-reaction steering units..........................................................................................16
OSPC load sensing dynamic reaction steering units................................................................................................... 17
OSPF load sensing dynamic non-reaction steering units.......................................................................................... 17
OSPD load sensing non-reaction steering units............................................................................................................18
OSPL load sensing static non-reaction steering units.................................................................................................19
OSPL load sensing dynamic non-reaction steering units.......................................................................................... 19
OSPBX and OSPLX load sensing static steering units for OSQ static..................................................................... 20
OSPCX load sensing dynamic steering units for OSQ dynamic...............................................................................20
Specification table for non catalogue numbers of LS Steering Units......................................................................... 21
Technical data................................................................................................................................................................................. 22
Displacement, flow and pressure: OSPB LS, OSPC LS, OSPC LSR.............................................................................22
Displacement, flow and pressure: OSPF LS..................................................................................................................... 24
Displacement, flow and pressure: OSPD LS.................................................................................................................... 24
Displacement, flow and pressure: OSPL LS, OSPBX LS, OSPCX LS, OSPLX LS..................................................... 25
Valve functions in OSPC, OSPF, OSPD and OSPL LS steering units..............................................................................26
Pilot pressure relief valve; (P - T, Qp) characteristic......................................................................................................26
Shock valves............................................................................................................................................................................... 26
Suction valves............................................................................................................................................................................ 26
Check valves............................................................................................................................................................................... 27
Port thread versions for OSPB LS, OSPC LS/LSR, OSPF LS, OSPD LS/LSR, OSPL LS, OSPBX LS, OSPCXLS, OSPLX LS.............................................................................................................................................................................28
Dimensions.......................................................................................................................................................................................31
OSPB LS for OLS, OSPBX LS for OSQ...................................................................................................................................31
OSPC LS/LSR and OSPF LS for OLS, OSPCX LS for OSQ............................................................................................... 33
OSPD LS/LSR for OLS............................................................................................................................................................... 35
OSPL LS for OLS and OSPLX LS for OSQ............................................................................................................................36
OSPL 1200 LS for OLS.............................................................................................................................................................. 38
Valve Block OVPLVersions............................................................................................................................................................................................. 39
Code numbers and weight.........................................................................................................................................................40
Technical data................................................................................................................................................................................. 43
Common data............................................................................................................................................................................ 43
Valve functions................................................................................................................................................................................43
Shock valves............................................................................................................................................................................... 44
Suction valves............................................................................................................................................................................ 44
Check valve................................................................................................................................................................................. 44
Backpressure valve...................................................................................................................................................................45
Installation........................................................................................................................................................................................ 46
Dimensions.......................................................................................................................................................................................46© Danfoss | April 2021

BC152886483962en-001003 | 3

Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow AmplifiersContents
Angle Block OVR
Version............................................................................................................................................................................................... 48
Code numbers and weight.........................................................................................................................................................48
Installation........................................................................................................................................................................................ 48
Dimensions.......................................................................................................................................................................................49
Priority Valves OLSA, OLS, and OLSP
Versions............................................................................................................................................................................................. 50
OLSA 40/80................................................................................................................................................................................. 51
OLS 40/80 and OLS 120.......................................................................................................................................................... 52
OLS 160.........................................................................................................................................................................................53
OLSP 80........................................................................................................................................................................................ 54
OLS 320.........................................................................................................................................................................................55
OLS 320 without pilot pressure relief valve.................................................................................................................... 56
System sizing................................................................................................................................................................................... 57
Code numbers and weights.......................................................................................................................................................57
OLS/OLSA static priority valves for load sensing static steering units.................................................................. 57
OLS/OLSA static priority valves for load sensing statics steering units................................................................ 58
OLS/OLSA dynamic priority valves for load sensing dynamic steering units..................................................... 58
OLS/OLSA dynamic priority valves for load sensing dynamic steering units..................................................... 59
OLS dynamic priority valves for OSPF LS and OSPU LS dynamic steering units................................................60
Specification table for non catalogue numbers of Danfoss Priority Valves..............................................................62
Technical data................................................................................................................................................................................. 63
Max. pressure on connections............................................................................................................................................. 63
Pressure drop in priority valves........................................................................................................................................... 63
Pressure drop P-EF for static priority valves....................................................................................................................63
Pressure drop P-EF for dynamic priority valves............................................................................................................. 65
Pressure drop P-EF for OLSP static priority valves........................................................................................................ 67
Pressure drop P-EF for OLSP dynamic priority valves..................................................................................................68
Pressure drop P-EF for OLS 320 static priority valves.................................................................................................. 68
Pressure drop P-EF for OLS 320 dynamic priority valves............................................................................................69
OLS 160 and OLS 320, pilot pressure relief valve (P - T, Qp) characteristics........................................................ 69
Dimensions.......................................................................................................................................................................................71
OLSA.............................................................................................................................................................................................. 71
OLS 40, OLS 80........................................................................................................................................................................... 73
OLS 120.........................................................................................................................................................................................75
OLS 160.........................................................................................................................................................................................76
OLSP 80........................................................................................................................................................................................ 77
OLS 320 in-line...........................................................................................................................................................................78
Flow Amplifiers OSQA and OSQB
Versions............................................................................................................................................................................................. 79
OSQA and OSQB static............................................................................................................................................................79
Code numbers and weights.......................................................................................................................................................80
OSQA and OSQB static flow amplifiers for load sensing static steering units....................................................80
Specification table for non catalogue numbers of Danfoss Flow Amplifier.............................................................81
Technical data................................................................................................................................................................................. 82
Flow and pressure.................................................................................................................................................................... 82
Total displacement of Steering System............................................................................................................................82
Installation...................................................................................................................................................................................82
Valve functions in the flow amplifiers...............................................................................................................................82
Priority valve...............................................................................................................................................................................82
OSQ pilot pressure relief valve (HP - HT, Qp) characteristic...................................................................................... 83
Back pressure valve..................................................................................................................................................................84
Shock valves............................................................................................................................................................................... 85
Suction valves............................................................................................................................................................................ 85
Dimensions.......................................................................................................................................................................................86
OSQA............................................................................................................................................................................................. 86
OSQB............................................................................................................................................................................................. 88

4 | © Danfoss | April 2021

BC152886483962en-001003

Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
A wide range of steering components

Danfoss is one of the largest producers in the world of steering components for hydrostatic steeringsystems on off-road vehicles. Danfoss offers steering solutions both at component and system levels. Our
product range makes it possible to cover applications of all types, ranging from ordinary 2 wheel steering(also known as Ackermann steering) to articulated steering, automatic steering (for example, by sensor)
and remote controlled steering via satellite. We can offer more than 1,800 different steering units and 250
different priority valves categorized in types, variants and sizes.
Danfoss offers:
For hydrostatic steering systems:
Product type

Displacement

Mini steering units

32 – 100 cm3/rev

Rated Flow

Steering Pressure[1.95 – 6.10 in3/rev]

max. 20 l/min[5.28 US gal/min]max. 150 bar[2180 psi]

Steering units

40 – 1200 cm3/rev[2.44 to 73.2 in3/rev]

max. 100 l/min[26.4 US gal/min]max. 240 bar[3481 psi]

Priority valves–40, 80, 120, 160, 320 l/min[10.6, 21.1, 31.7, 42.3, 84.5
US gal/min]max. 350 bar[5076 psi]–
Pilot operated flowamplifiers (factors: 4, 5, 8,
or 10)
Pilot operated steering
valves–

240 and 400 l/min [63.4 and max. 240 bar
105.7 US gal/min][3480 psi]
max. 100 l/min[26.4 US gal/min]max. 250 bar[3625 psi]

For electrohydraulic steering systems© Danfoss | April 2021

Product type

Displacement

Rated flow

Steering pressure

Pilot operated steering
valves-

100 l/min [26.4 US gal/min]

250 bar [3625 psi]

Integrated electricaloperated steering valve

100 - 500 cm3/rev[6.10 - 30.51 in3]

50 l/min [13.2 US gal/min]

210 bar [3045 psi]Electrical operated
steering valve-

70 l/min [18.5 US gal/min]

210 bar [3045 psi]

BC152886483962en-001003 | 5

Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
A wide range of steering components
Characteristic features for steering units:

•
•
•
•
•
•

Low steering torque: from 0.5 to 3 N•m in normal steering situations
Low noise levelLow pressure drop
Many types available: Open center Non-reaction, Open center Reaction, Power Beyond, Closed center
Non-reaction, Load Sensing, Load Sensing Reaction
One or more built-in valve functions: relief valve, shock valves, suction valves, non-return valve in Pline and LS-line
Optional port connections according to ISO, SAE or DIN standards

Characteristics for EH steering systems with OSPE, EHPS, and EHi:•••

Possibility of GPS, row sensor, variable steering ratio and joystick steering
Possibility of manual steering even on very heavy vehicles
EHPS:‒ High steering pressure requiring smaller cylinders and flow

‒ Low pilot pressure and flow giving extremely low noise in the cabin‒ Combined with Danfoss PVG 32 proportional valve

Conversion factors
1 N•m = [8.851 lbf•in]

1 l = [0.264 US gal]

1 N = [0.2248 lbf]

1 bar = [14.5 psi]

1 mm = [0.0394 in]°F = [1.8°C + 32]

1 cm3 = [0.061 in3]

Survey of literature on Danfoss steering components
Detailed data on all Danfoss steering components and accessories can be found in our steering
component catalogs, which is divided in to the following individual sub catalogs:
General information

Steering components

Technical data on mini steering units

OSPM

Technical data on open center, and closed center
steering units

OSPB, OSPC, and OSPD

Technical data on load sensing steering units, priority
valves and flow amplifiers

OSPB, OSPC, OSPF, OSPD, OSPL, OSPBX, OSPLX, OVPL,OLS and OSQ

Technical data on load sensing steering unit withamplification

OSPU

Technical data on hydraulic and EH pilot operated
steering valves, electrical actuation modules andappropriate steering units.

EHPS, EHPS w. OLS 320, PVE for EHPS and OSPCXTechnical data on combined steering unit/EH steering
valves and steering wheel sensors

OSPE

Technical data on electrohydraulic steering valves

EHi

Technical data on steering wheel sensors

SASA

For technical information on individual variants, please contact the Danfoss Sales Organization.

6 | © Danfoss | April 2021

BC152886483962en-001003

Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
LS Steering Units OSPB, OSPC, OSPF, OSPD, OSPL
Versions
Load sensing
In load sensing steering systems both the steering system and the working hydraulics can be suppliedwith oil from the same pump, using a load sensing pump, also delivers the potential for energy saving.
Load sensing steering units have an extra connection for load sensing (LS), so that a load pressure signal
can be directed via the steering unit to a Danfoss priority valve and/or an LS pump. The load sensing
signal controls the oil flow from the priority valve (and/or the LS pump) to the steering unit. The LS
connection is open to tank when the steering unit is in the neutral position.
Load sensing static
Load sensing static steering units require load sensing static priority valves and/or load sensing static
variable displacement pumps. Load sensing static steering systems have no oil flow in the LS connection
when the steering unit is in neutral position.
Load sensing dynamic
Load sensing dynamic steering units require load sensing dynamic priority valves and/or load sensing
dynamic variable displacement pumps. Load sensing dynamic steering systems have a constant oil flowin the LS connection in the direction of the steering unit even when the steering unit is in neutral
position.
ReactionWith reaction steering units any external forces acting on the steered wheels result in a corresponding
movement of the steering wheel when the driver is not steering the vehicle.
Non-reaction
With non-reaction steering units there is no corresponding movement of the steering wheel when thedriver is not steering the vehicle© Danfoss | April 2021

BC152886483962en-001003 | 7

Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
LS Steering Units OSPB, OSPC, OSPF, OSPD, OSPLOSPB LS: Steering unit with no valve functions

OSPB LS (OLS)
Load sensing static non-reaction and load sensing dynamic non-reaction

Top: Danfoss diagram; bottom: CETOP diagram
R

L

P

LS

T
R

L

P

T

LS
150-301.11

8 | © Danfoss | April 2021

BC152886483962en-001003

Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
LS Steering Units OSPB, OSPC, OSPF, OSPD, OSPLOSPC LS: Steering unit load sensing with integrated valve functions for in line priority valve OLS
OSPC LS (OLS)
Load sensing dynamic non-reaction

R

L

LS

P

T

L

R

LS

P

T
150-595.11

OSPC LS: Steering unit load sensing with integrated valve functions for flange on priority valve
OLSA
OSPC LS (OLSA)
Load sensing dynamic non-reaction

L

P

T

L

P

T

LS R

LS R
150-596.10© Danfoss | April 2021

BC152886483962en-001003 | 9

Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
LS Steering Units OSPB, OSPC, OSPF, OSPD, OSPLOSPC LSR: Steering unit load sensing dynamic with integrated valve functions
OSPC LSR (OLS)
Load sensing dynamic reaction

R

L

P

LS

T
R

L

P

T LS
150-598.11

OSPF LS : Steering unit full drain load sensing dynamic and with integrated valve functions
OSPF LS (OLS)
Load sensing dynamic non-reaction

R

L

LS

P

T

L

R

P

T LS
150-597.11

10 | © Danfoss | April 2021

BC152886483962en-001003

Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
LS Steering Units OSPB, OSPC, OSPF, OSPD, OSPLOSPD LS: Steering unit load sensing dynamic with 2 rotary meters and with integrated valvefunctions
The OSPD has 2 rotary meters (gear wheel sets). Should the pump supply be lost, only one rotary meter
will be active: OSPD displacement will be low for emergency steering (only one rotary meter active) forpressure P-T <3 bar. Displacement will be high for pressure P-T >5 bars: both rotary meters are active.
OSPD LS (OLS)
L

R

LS

P

T

L

P

R

T

LS
150-599.11

Load sensing dynamic non-reaction© Danfoss | April 2021

BC152886483962en-001003 | 11

Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
LS Steering Units OSPB, OSPC, OSPF, OSPD, OSPLOSPL LS:
Steering unit load sensing for high steering flow, displacement larger than 500 cm3/rev [30.5 in3/rev].
OSPL LS (OLS) - Load sensing static non-reaction
R

L

P

LS

T
R

L

P

T

LS
150-301.11

OSPL LS (OLS) - Load sensing dynamic non-reaction

R

L

LS

P

T

L

R

LS

P

T
150-601.10

12 | © Danfoss | April 2021

BC152886483962en-001003

Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
LS Steering Units OSPB, OSPC, OSPF, OSPD, OSPLOSPL 1200 (OLS) Load sensing dynamic non-reaction

R

L

LS
P

T

LS
R

L

P

T

LS

150-613.10© Danfoss | April 2021

BC152886483962en-001003 | 13

Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
LS Steering Units OSPB, OSPC, OSPF, OSPD, OSPLOSPBX LS, OSPCX LS and OSPLX LS: Steering units load sensing for flow amplifiers
OSPBX LS and OSPLX LS are load sensing steering units with the L and the R connections open to tankwhen in neutral position. OSPBX LS and OSPLX LS can only be used with Danfoss flow-amplifiers OSQA or
OSQB. OSPBX LS and OSPLX LS steering units must not be connected directly to the steering cylinder.
OSPCX LS is for OSQ dynamic has per standard included check valve in P and check valve in LS
OSPBX LS, OSPLX LS - Load sensing static

L

R

P

LS

T

L

R

P

T

LS
150-310.12

14 | © Danfoss | April 2021

BC152886483962en-001003

Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
LS Steering Units OSPB, OSPC, OSPF, OSPD, OSPL
Code numbers and weights
OSPB load sensing static non-reaction steering units
OSPB LS Static steering units have no valve functions.
OSPB LS in the table below have all standard neutral setting springs, see Specification Table for Non
Catalogue Numbers of LS Steering Units
Steering unit

Code Numbers

Weightkg [lb]Connections
European version for OLS
G 1/2
G 1/4 - S**)

US version for OLS
3/4-16 UNF - O*)
7/16-20 UNF - O*) + S**)OSPB 50 LS-

150G6085

5.2 [11.46]

OSPB 80 LS-

150G6086

5.3 [11.68]

OSPB 100 LS-

150G6087

5.4 [11.90]

OSPB 125 LS-

150G6088

5.5 [12.13]

OSPB 160 LS-

150G6089

5.6 [12.35]

OSPB 200 LS

150-0103

150G6090

5.8 [12.79]

OSPB 315 LS

150-0104150-0116

6.2 [13.67]

OSPB 400 LS

150-0105150-0117

7.0 [15.43]*) O-ring chamfer on port connections**) Spot face around port connection

Valve blocks OVP and OVR can be mounted on all of the OSPB steering units from the above table.
OSPB load sensing dynamic non-reaction steering units
OSPB LS Dynamic steering units have no valve functions.
OSPB LS in the table below have all standard neutral setting springs, see Specification Table for Non
Catalogue Numbers of LS Steering Units
Steering unit

Code Numbers
Connections
US version for OLS
3/4-16 UNF - O*)
7/16-20 UNF - O*) + S**)

Weightkg [lb]OSPB 50 LS

150-82045.2 [11.46]

OSPB 80 LS

150-8205

5.3 [11.68]

OSPB 100 LS

150-8206

5.4 [11.90]

OSPB 125 LS

150-8207

5.5 [12.13]

OSPB 160 LS

150-8208

5.6 [12.35]

OSPB 200 LS

150-8209

5.8 [12.79]

OSPB 315 LS

150-8210

6.2 [13.67]

OSPB 400 LS

150-8211

7.0 [15.43]*) O-ring chamfer on port connections**) Spot face around port connection

Valve blocks OVP and OVR can be mounted on all of the OSPB steering units from the above table© Danfoss | April 2021

BC152886483962en-001003 | 15

Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
LS Steering Units OSPB, OSPC, OSPF, OSPD, OSPLOSPC load sensing static non-reaction steering unit
OSPC LS Static steering units in the table below incorporate all the following valve functions:• check valve in P-port•••pilot pressure relief valve
shock valves
suction valves

OSPC LS in the table below have all standard neutral setting springs, see Specification Table for Non
Catalogue Numbers of LS Steering Units
Steering unit

Code numbers

Valve settings

Connections

Reliefvalve
bar [psi]

Shock
valve
bar [psi]

170[2465]

225[3263]

Weightkg [lb]Europeanfor OLS
G 1/2
G 1/4 - S**)

Europeanand
US version
for OLSA

US version for OLS
3/4-16 UNF - O*)
7/16-20 UNF - O*) + S**)OSPC 80 LS

150-1230

150-1188

150-1222

OSPC 100 LS

150-1231

150-1189

150-1221

OSPC 125 LS

150-1232

150-1190

150-1220

5.5 [12.13]

OSPC 160 LS

150-1233

150-1191

150-1219

5.6 [12.35]

OSPC 200 LS

150-1234

150-1192150-1218

5.8 [12.79]

OSPC 315 LS

150-1235-

150G6091

6.2 [13.67]

OSPC 400 LS

150-1240--

7.0 [15.43]

5.3 [11.68]
5.4 [11.90]*) O-ring chamfer on port connections**) Spot face around port connections

If you require other port connections, valve combinations and/or other valve settings or otherdisplacements, please fill in the order form in the Specification Table for Non Catalogue Numbers of LS
Steering Units and contact the Danfoss Sales Organization.
OSPC load sensing dynamic non-reaction steering units
OSPC LS Dynamic steering units in the table below incorporate all the following valve functions:• check valve in P-port

•
•
•
•

pilot pressure relief valve
shock valves
suction valvescheck valve in LS-line for all OSPC LS Dynamic up to and including 200 cm³/rev

OSPC LS in the table below have all standard neutral setting springs, see Specification Table for Non
Catalogue Numbers of LS Steering Units

16 | © Danfoss | April 2021

BC152886483962en-001003

Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
LS Steering Units OSPB, OSPC, OSPF, OSPD, OSPL
Steering unit

Code numbers

Valve settings

Connections

Reliefvalve
bar [psi]

Shock
valve
bar [psi]

Weightkg [lb]Europeanversion for OLS
G 1/2 - S**)G 1/4 - S**)

European and
US version for
OLSA

US version
for OLS
3/4-16 UNF - O*)
7/16-20 UNF - O*)+S**)

OSPC 50 LS

150-8233

150-8222

150-8215140[2030]

200[2900]

5.2 [11.46]

OSPC 80 LS

150-8234

150-8223

150-8216

150-8235

150-8224

150-8217170[2465]

225[3263]

5.3 [11.68]

OSPC 100 LS
OSPC 125 LS

150-8236

150-8225

150-8218

5.5 [12.13]

OSPC 160 LS

150-8237

150-8226

150-8219

5.6 [12.35]

OSPC 200 LS

150-8238

150-8227150-8220

5.8 [12.79]

OSPC 315 LS

150-8239-

150-8221

6.2 [13.67]

OSPC 400 LS

150-8240--

7.0 [15.43]

5.4 [11.90]**) Spot face around port connections*) O-ring chamfer on port connections

If you require other port connections, valve combinations and/or other valve settings or otherdisplacements please fill in the order form in the Specification Table for Non Catalogue Numbers of LS
Steering Units and contact the Danfoss Sales Organization.
OSPC load sensing dynamic reaction steering units
OSPC LSR Dynamic steering units in the table below incorporate all the following valve functions:• check valve in P-port

•
•
•
•

pilot pressure relief valve
shock valves
suction valvescheck valve in LS-line

OSPC LSR in the table below have all standard neutral setting springs, see Specification Table for Non
Catalogue Numbers of LS Steering Units
Steering unit

Code numbers

Valve settings

Connections
European version for OLS
G 1/2 - S**)G 1/4 - S**)

Relief valve
bar [psi]

Shock valve
bar [psi]

OSPC 80 LSR

150-8241

170 [2465]

225 [3263]

OSPC 200 LSR

150-8242

Weightkg [lb]5.3 [11.68]
5.8 [12.79]**) Spot face around port connections (can not be used in connection with OVR angular block)If you require other port connections, valve combinations, valve settings and/or other displacements,
please fill in the order form in the Specification Table for Non Catalogue Numbers of LS Steering Units andcontact the Danfoss Sales Organization.
OSPF load sensing dynamic non-reaction steering units
OSPF LS Dynamic steering units in the table below incorporate all the following valve functions:© Danfoss | April 2021

BC152886483962en-001003 | 17

Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
LS Steering Units OSPB, OSPC, OSPF, OSPD, OSPL

•
•
•
•

check valve in P-portpilot pressure relief valve
shock valves
suction valves

OSPF LS in the table below have all soft neutral setting springs, see Specification Table for Non Catalogue
Numbers of LS Steering Units
Steering unit

Code numbers

Valve settings

Weightkg [lb]Connections
European version for OLS
G 1/2 - S**)G 1/4 - S**)

Relief valve
bar [psi]

Shock valve
bar [psi]

OSPF 80 LS

150G5079

170 [2465]

225 [3263]

OSPF 100 LS

150G5080

5.4 [11.90]

OSPF 125 LS

150G5081

5.5 [12.13]

OSPF 160 LS

150G5082

5.6 [12.35]

OSPF 200 LS

150G5083

5.8 [12.79]

OSPF 315 LS

150G5084

6.2 [13.67]

OSPF 400 LS

150G5085

7.0 [15.43]

5.3 [11.68]**) Spot face around port connections (can not be used in connection with OVR angular block)If you require other port connections, valve combinations, valve settings and/or other displacements,
please fill in the order form in the Specification Table for Non Catalogue Numbers of LS Steering Units andcontact the Danfoss Sales Organization.
OSPD load sensing non-reaction steering units
OSPD LS Dynamic steering units in the table below incorporate all the following valve functions:• check valve in P-port

•
•
•
•

pilot pressure relief valve
shock valves
suction valvescheck valve in LS-line

OSPD LS in the table below have all standard neutral setting springs, see Specification Table for Non
Catalogue Numbers of LS Steering Units
Steering unit

Code numbers

Valve settings

Weightkg [lb]Connections
European version
G 1/2 - S**)G 1/4 - S**)

Relief valve
bar [psi]

Shock valve
bar [psi]

OSPD 70/230 LS

11113141

170 [2465]

225 [3263]

OSPD 70/270 LS

11113142

7.9 [17.41]

OSPD 70/385 LS

11113143

8.4 [18.52]

OSPD 125/325 LS

11113146

8.1 [12.79]

OSPD 125/440 LS

11113147

8.6 [18.96]

7.7 [17.00]**) Spot face around port connections (can not be used in connection with OVR angular block)If you require other port connections, valve combinations, valve settings and/or other displacements,
please fill in the order form in the Specification Table for Non Catalogue Numbers of LS Steering Units andcontact the Danfoss Sales Organization.
18 | © Danfoss | April 2021

BC152886483962en-001003

Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
LS Steering Units OSPB, OSPC, OSPF, OSPD, OSPLOSPL load sensing static non-reaction steering units
OSPL LS Static steering units have no valve functions.
OSPL LS in the three tables below have all strong neutral setting springs, see Specification Table for Non
Catalogue Numbers of LS Steering Units
Steering unit

Code numbers

Weightkg [lb]Connections
European version
for OLS
G 1/2
G 1/4 - S**)

US version for OLS
3/4-16 UNF - O*)*
7/16-20 UNF - O* +S**)

US version for OLS
and OVPL LS - port
7/16-20 UNF - O* +S**)OSPL 520 LS

150-7169

150-7167

150-7168

8.1 [17.86]

OSPL 630 LS

150-7107

150-7164

150-7113

8.4 [18.52]

OSPL 800 LS

150-7108150-7165

150-7114

8.8 [19.40]

OSPL 1000 LS

150-7110150-7166

150-7115

10.0 [22.05]**) Spot face around port connection*) O-ring chamfer on port connections

OSPL load sensing dynamic non-reaction steering units
OSPL LS Dynamic steering units in the table below have no valve functions.
Steering unit

Code numbers

Weightkg [lb]Connections
US version for OLS
3/4-16 UNF - O*)
7/16-20 UNF - O*)* +S**)OSPL 520 LS

150-8243

8.1 [17.86]

OSPL 630 LS

150-8212

8.4 [18.52]

OSPL 800 LS

150-8213

8.8 [19.40]

OSPL 1000 LS

150-821410.0 [22.05]*) O-ring chamfer on port connections**) Spot face around port connection

OSPL LS Dynamic steering units in the table below incorporate all the following valve function:pilot pressure relief valve•

Steering unit

Code numbers

Valve settings

Connections
European version
for OLS and OVPLLS: G 1/4 - S**)

Relief valve
bar [psi]

OSPL 520 LS

150-8244

170 [2465]

OSPL 1000 LS

150-8245

Weightkg [lb]8.1 [17.86]
10.0 [22.05]**) Spot face around port connection

If you require other displacements or other valve setting, please fill in the order form in the Specification
Table for Non Catalogue Numbers of LS Steering Units and contact the Danfoss Sales Organization.
OSPL 1200 LS Dynamic steering unit in the table below incorporate all the following valve function:© Danfoss | April 2021

BC152886483962en-001003 | 19

Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
LS Steering Units OSPB, OSPC, OSPF, OSPD, OSPL••

shock valves
suction valves

OSPL 1200 LS in the table below has strong neutral setting springs, see Specification Table for Non
Catalogue Numbers of LS Steering Units
Steering unit

OSPL 1200 LS

Code numbers

Valve settings

Connections
US version for OLS
3/4 - 16 UNF - O*)
CF: 11/16 - 12 UN
7/16 - 20 UNF - O*)* + S**)

Shock valvesbar [psi]

150-7175

280 [4061]

Weightkg [lb]11 [24.25]*) O-ring chamfer on port connections**) Spot face around port connection

If you require other displacements or other valve setting, please fill in the order form in the Specification
Table for Non Catalogue Numbers of LS Steering Units and contact the Danfoss Sales Organization.
OSPBX and OSPLX load sensing static steering units for OSQ static
OSPBX LS and OSPLX LS Static steering units in the table below have no valve functions.
OSPBX LS in the table below have all standard neutral setting springs, see Specification Table for Non
Catalogue Numbers of LS Steering UnitsOSPLX LS in the table below have all strong neutral setting springs, see Specification Table for Non
Catalogue Numbers of LS Steering Units
Steering unit

Code numbers

Weightkg [lb]Connections
European version
G 1/2
G 1/4 - S**)

US version
3/4-16 UNF - O*)
7/16-20 UNF - O*)* + S**)OSPBX 160 LS

150-1082

150-1078

5.6 [12.35]

OSPBX 200 LS

150-1083

150-1079

5.8 [12.79]

OSPBX 315 LS

150-1084

150-1080

6.2 [13.67]

OSPBX 400 LS

150-1085

150-1081

7.0 [15.43]

OSPLX 520 LS

150-7170

150-7173

8.1 [17.86]

OSPLX 630 LS

150-7171150-7174

8.4 [18.52]

OSPLX 800 LS

150-7172

150-7155

8.8 [19.40]**) Spot face around port connection*) O-ring chamfer on port connections

OSPCX load sensing dynamic steering units for OSQ dynamic
OSPCX LS Dynamic steering unit in the table below incorporates the following valve function:• pilot pressure relief valve
See Specification Table for Non Catalogue Numbers of LS Steering Units
If you require other displacements or other valve setting, please fill in the order form in the Specification
Table for Non Catalogue Numbers of LS Steering Units and contact the Danfoss Sales Organization.

20 | © Danfoss | April 2021

BC152886483962en-001003

Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
LS Steering Units OSPB, OSPC, OSPF, OSPD, OSPL
Specification table for non catalogue numbers of LS Steering Units
Fill in your company data and place x’s in the table where appropriate, then send to your Danfoss Sales
Organization.
Your
companyName

Steering unit
type

OSPC

VehiclePotential pcs/year

OSPF

OSPD

Completed by

OSPL

OSPBX

Date

OSPCX

Reaction type LS ( Non-reaction)

LSR (Reaction: only OSPC, OSPD)

Load Sensing Static (Only OSPC, OSPL, OSPBX, OSPCX, OSPLX)
type

Dynamic

DP, cm³/rev
OSPC LS
OSPF LS40

DP, cm³/rev
OSPC LSR

40

DP, cm³/rev
OSPD LS

60/185DP, cm³/rev
OSPD LSR

60/18560/22070/19570/230100/200

DP, cm³/rev
OSPL, OSPLX

520

630

800

1000

1200 (only OSPL)

DP, cm³/rev
OSPBX LSOSPCX LS

160

200

250

315

400

Port threads
OSPC, OSPF

G1/2

G1/2- S**

M18 × 1.5 - O* + S**

3/4-16 UNF - O*

for OLSA (only OSPC)Port threads
OSPD

G1/2- S**Port threads
OSPL, OSPLX

G1/2

Reliefvalve***
bar

70

Shock valves
bar

160

SuctionvalvesYes

No

Check valvein LS

Yes (Only for OSPC dynamic and OSPD)

No (Only for OSPC, OSPF and OSPL)

Neutralsetting
springsSoft:
0.5 - 1.8 Nm in normal steering situations

Unit black
paintedYes© Danfoss | April 2021

50

60

50

60/22070806060/2607070/195

3/4-16 UNF - O*

80

90

180

100

100

110

200

125

160

80

70/23070/270185

100

70/385

200

230

OSPLX

125

100/200

250

160

315

185

400

200

100/260 100/300 125/285 125/325 125/440

M18 × 1.5 - O* + S**

3/4-16 UNF - O*

For OPVL and without RV (LS = 7/16 - 20
UNF)

For OVPL and with RV (LS = G 1/4)

120

210

140

170

190

225

200

240

Standard:
0.8 - 3 Nm in normal steering situations

no relief valve

280

no shock valves

Strong:
1.5 - 4 Nm in normal steering situations

No

BC152886483962en-001003 | 21

Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
LS Steering Units OSPB, OSPC, OSPF, OSPD, OSPLDP = Displacement, RV = Pilot pressure relief valve.
O*: O-ring chamfer on port connections.
S**: Spot face around port connections (can not be used in connection with OVR angular block).
RV*** see Technical data for limitation in maximum pressure depending on displacements.
Types not mentioned with port connections in the table above, are only available in the version(s) statedin the code number tables.
An alternative way to specify a variant is to state an existing code number and add the modifications, you
would like to have implemented in the basic steering unit.
Code number of basic steering unit: __________________________________________________
Requested modifications: ___________________________________________________________
Technical data
Common data, refer to General Steering Components Technical Information, BC152886484183.
Displacement, flow and pressure: OSPB LS, OSPC LS, OSPC LSROSPB LS, OSPC LS, OSPC LSRSteering unit

Displacement Rated oil
cm³/rev
flow*[in³/rev]l/min[US gal/min]Max. pressure, bar (psi)Systempressure**
P-T portpressureT,absolute
portpressure

L-T/R-T
port
pressure

OSPC 40 LS Static

40 [2.44]

4 [1.06]

140 [2030]

40 [580]

280 [4061]

OSPB/OSPC 50 LS Static

50 [3.05]

5 [1.32]

OSPC 60 LS Static

60 [3.66]

6 [1.58]OSPC 70 LS Static

70 [4.27]

7 [1.85]

OSPB/OSPC 80 LS Static

80 [4.88]

8 [2.11]

OSPB/OSPC 100 LS Static

100 [6.10]

10 [2.64]

OSPB/OSPC 125 LS Static

125 [7.63]

13 [3.43]

OSPB/OSPC 160 LS Static

160 [9.76]

16 [4.23]

OSPC 185 LS Static

185 [11.29]

19 [5.02]

OSPB/OSPC 200 LS Static

200 [12.20]

20 [5.28]

OSPC 230 LS Static

230 [14.03]

23 [6.07]

OSPC 250 LS Static

250 [15.25]

25 [6.60]

OSPB/OSPC 315 LS Static

315 [19.22]

32 [8.45]

OSPB/OSPC 400 LS Static

400 [24.41]

40 [10.57]

175 [2538]

210 [3045]* Rated flow at 100 rpm.
** Any OSPB/C LS Static can withstand 210 bar in maximum system pressure. However, OSPB/C with small gear wheel

set and high pressure will have relatively high slippage values.

22 | © Danfoss | April 2021

BC152886483962en-001003

Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
LS Steering Units OSPB, OSPC, OSPF, OSPD, OSPLOSPB LS, OSPC LS, OSPC LSR
Displacement Rated oil
cm³/rev
flow*
l/min[in³/rev][US gal/min]Max. pressure, bar (psi)Systempressure**
P-T portpressureT,absolute
portpressure

L-T/R-T
port
pressure

OSPC 40 LS Dynamic

40 [2.44]

4 [1.06]

140 [2030]

40 [580]

280 [4061]

OSPB/OSPC 50 LS Dynamic

50 [3.05]

5 [1.32]

OSPC 60 LS Dynamic

60 [3.66]

6 [1.58]OSPC 70 LS Dynamic

70 [4.27]

7 [1.85]

OSPB/OSPC 80 LS Dynamic

80 [4.88]

8 [2.11]

OSPB/OSPC 100 LS Dynamic

100 [6.10]

10 [2.64]

OSPB/OSPC 125 LS Dynamic

125 [7.63]

13 [3.43]

OSPB/OSPC 160 LS Dynamic

160 [9.76]

16 [4.23]

OSPC 185 LS Dynamic

185 [11.29]

19 [5.02]

OSPB/OSPC 200 LS Dynamic

200 [12.20]

20 [5.28]

OSPC 230 LS Dynamic

230 [14.03]

23 [6.07]

OSPC 250 LS Dynamic

250 [15.25]

25 [6.60]

OSPB/OSPC 315 LS Dynamic

315 [19.22]

32 [8.45]

40 [580]

280 [4061]

Steering unit

OSPB/OSPC 400 LS Dynamic

400 [24.41]

40 [10.57]

OSPC 40 LSR Dynamic

40 [2.44]

4 [1.06]

OSPC 50 LSR Dynamic

50 [3.05]

5 [1.32]

OSPC 60 LSR Dynamic

60 [3.66]

6 [1.58]OSPC 70 LSR Dynamic

70 [4.27]

7 [1.85]

OSPC 80 LSR Dynamic

80 [4.88]

8 [2.11]

SPC 100 LSR Dynamic

100 [6.10]

10 [2.64]

OSPC 125 LSR Dynamic

125 [7.63]

13 [3.43]

OSPC 160 LSR Dynamic

160 [9.76]

16 [4.23]

OSPC 185 LSR Dynamic

185 [11.29]

19 [5.02]

OSPC 200 LSR Dynamic

200 [12.20]

20 [5.28]

175 [2538]

210 [3045]

140 [2030]

175 [2538]

210 [3045]* Rated flow at 100 rpm.
** Any OSPB/C LS Dynamic can withstand 210 bar in maximum system pressure. However, OSPB/C with small gear
wheel set and high pressure will have relatively high slippage values.

© Danfoss | April 2021

BC152886483962en-001003 | 23

Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
LS Steering Units OSPB, OSPC, OSPF, OSPD, OSPL
Displacement, flow and pressure: OSPF LS
Steering unit

Displacement Rated oilflow*
cm³/rev [in³/l/min[US gal/rev]
min]Max. pressure, bar (psi)Systempressure**
P-T portpressureT, absolute
port pressure

L-T/R-T portpressure

OSPF 50 LS Dynamic

50 [3.05]

5 [1.32]

140 [2030]

40 [580]

280 [4061]

OSPF 60 LS Dynamic

60 [3.66]

6 [1.58]

OSPF 70 LS Dynamic

70 [4.27]

7 [1.85]

OSPF 80 LS Dynamic

80 [4.88]

8 [2.11]OSPF 100 LS Dynamic

100 [6.10]

10 [2.64]

OSPF 125 LS Dynamic

125 [7.63]

13 [3.43]

OSPF 160 LS Dynamic

160 [9.76]

16 [4.23]

OSPF 185 LS Dynamic

185 [11.29]

19 [5.02]

OSPF 200 LS Dynamic

200 [12.20]

20 [5.28]

OSPF 230 LS Dynamic

230 [14.03]

23 [6.07]

OSPF 250 LS Dynamic

250 [15.25]

25 [6.60]

OSPF 315 LS Dynamic

315 [19.22]

32 [8.45]

OSPF 400 LS Dynamic

400 [24.41]

40 [10.57]

175 [2538]

210 [3045]* Rated flow at 100 rpm.
** Any OSPB/C/F LS Dynamic can withstand 210 bar in max. system pressure. However OSPB/C/F w. small gear wheel

set and high pressure will have relatively high slippage values.

Displacement, flow and pressure: OSPD LSOSPD steering units in the table below are all Load Sensing Dynamic type.
Steering unit

24 | © Danfoss | April 2021

Displacement
manual steermode
cm³/rev[in³/rev]

Displacement
normal steermode
cm³/rev[in³/rev]

Rated oil
flow*
l/min
[US gal/min]Max. pressure, bar (psi)T,absolute
portpressure

L-T/R-T
port
pressure

210 [3045] 40 [580]

280 [4061]

OSPD 60/185 LS

60 [3.66]

185 [11.29]

19 [5.02]

OSPD 60/220 LS

60 [3.66]

220 [13.42]

22 [5.81]

OSPD 60/260 LS

60 [3.66]

260 [15.87]

26 [6.87]

OSPD 70/195 LS

70 [4.27]

195 [11.90]

20 [5.28]

OSPD 70/230 LS

70 [4.27]

230 [14.03]

23 [6.07]

OSPD 70/270 LS

70 [4.27]

270 [16.48]

27 [7.13]

OSPD 70/385 LS

70 [4.27]

385 [23.49]

39 [10.30]

OSPD 100/200 LS

100 [6.10]

200 [12.20]

20 [5.28]

OSPD 100/260 LS

100 [6.10]

260 [15.87]

26 [6.87]

OSPD 100/300 LS

100 [6.10]

300 [18.31]

30 [7.93]

OSPD 125/285 LS

125 [7.63]

285 [17.39]

29 [7.66]

OSPD 125/325 LS

125 [7.63]

325 [19.83]

33 [8.72]

OSPD 125/440 LS

125 [7.63]

440 [26.85]

44 [11.62]

SystemPressure
P-T portpressure

BC152886483962en-001003

Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
LS Steering Units OSPB, OSPC, OSPF, OSPD, OSPL
Displacement
manual steermode
cm³/rev[in³/rev]

Displacement
normal steermode
cm³/rev[in³/rev]

Rated oil
flow*
l/min
[US gal/min]Max. pressure, bar (psi)T,absolute
portpressure

L-T/R-T
port
pressure

OSPD 60/185 LSR

60 [3.66]

185 [11.29]

19 [5.02]

210 [3045] 40 [580]

280 [4061]

OSPD 60/220 LSR

60 [3.66]

220 [13.42]

22 [5.81]

OSPD 70/195 LSR

70 [4.27]

195 [11.90]

20 [5.28]

OSPD 100/200 LSR

100 [6.10]

200 [12.20]

20 [5.28]

Steering unit

SystemPressure
P-T portpressure* Rated flow at 100 rpm.

Displacement, flow and pressure: OSPL LS, OSPBX LS, OSPCX LS, OSPLX LS
Steering unit

Displacement Rated oil
cm³/rev
flow*[in³/rev]l/min[US gal/min]Max. pressure, bar (psi)Systempressure
P-T portpressureT,absolute
portpressure

L-R
port
pressure

OSPL 520 LS Static

520 [31.73]

52 [13.74]

240 [3480]

40 [580]

280 [4061]

OSPL 630 LS Static

630 [38.44]

63 [16.64]

OSPL 800 LS Static

800 [48.82]

80 [21.10]

OSPL 1000 LS Static

1000 [61.02]

100 [26.40]

OSPL 520 LS Dynamic

520 [31.73]

52 [13.74]

240 [3080]

40 [580]

280 [4061]

OSPL 630 LS Dynamic

630 [38.44]

63 [16.64]

OSPL 800 LS Dynamic

800 [48.82]

80 [21.10]

OSPL 1000 LS Dynamic

1000 [61.02]

100 [26.40]

OSPL 1200** Dynamic

1200 [73.22]

100 [26.40]

OSPBX 160 LS Static

160 [9.76]

16 [4.23]

210 [3045]

40 [580]

280 [4061]

OSPBX 200 LS Static

200 [12.20]

20 [5.28]

OSPBX 250 LS Static

250 [15.25]

25 [6.60]

OSPBX 315 LS Static

315 [19.22]

32 [8.45]

210 [3045]

40 [580]

280 [4061]

240 [3480]

40 [580]

280 [4061]

OSPBX 400 LS Static

400 [24.41]

40 [10.57]

OSPCX 160 LS Dynamic

160 [9.76]

16 [4.23]

OSPCX 200 LS Dynamic

200 [12.20]

20 [5.28]

OSPCX 250 LS Dynamic

250 [15.25]

25 [6.60]

OSPCX 315 LS Dynamic

315 [19.22]

32 [8.45]

OSPCX 400 LS Dynamic

400 [24.41]

40 [10.57]

OSPLX 520 LS Static

520 [31.73]

52 [13.74]

OSPLX 630 LS Static

630 [38.44]

63 [16.64]

OSPLX 800 LS Static

800 [48.82]

80 [21.10]* Rated flow at 100 rpm.
** OSPL 1200 max speed at 100l/min [26.4 US gal/min] 83 rpm.

© Danfoss | April 2021

BC152886483962en-001003 | 25

Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
LS Steering Units OSPB, OSPC, OSPF, OSPD, OSPL
Valve functions in OSPC, OSPF, OSPD and OSPL LS steering units
Pilot pressure relief valve; (P - T, Qp) characteristic
The pilot pressure relief valve protects the steering unit against excessive pressure. The pilot pressure
relief valve in the OSPC LS, OSPF LS, OSPD LS and OSPL LS steering unit together with the priority valve
limit the maximum steering pressure P-T. The pilot pressure relief valve is set at an oil flow to the priority
valve of 25 l/min [6.60 US gal/min].
For OSPC, OSPD and OSPL load sensing dynamic steering units, the setting values are valid at a dynamic
flow of 0.6 l/min [0.16 US gal/min].
For OSPF load sensing dynamic steering units, the setting values are valid at a dynamic flow of 1.1 l/min[0.29 US gal/min].
Setting tolerance:</= 170 bar [2465 psi]: rated value +5 bar [72.5 psi].
> 170 bar [2465 psi]: rated value +10 bar [145 psi].
P-T
psi
3000

2500

P-T
bar
200

A

180
160

2000

B

140
120

1500

1000

100
80
60

0

OSPC/OSPF/OSPD/OSPU/OSPL LS+OLS 80

Qp

0
0
0

10
2

20
4

30
6

8

40
10

50
12

60
14

16

70
18

80
20

l/min

Qp
US gal/min
152B79.10

A = 170 + 5 bar [2465+ 73 psi]
B = 140 + 5 bar [2030 + 73 psi]
Shock valves
The shock valves protect the steering unit and reduce external forces on the steering cylinder by limiting
the pressure difference from L to T and from R to T.
The shock valves are set at 3 l/min [0.792 US gal/min]At higher flow pressure peaks may occur.
The shock valves are of the direct acting type, so they react very quickly.
Setting tolerance: rated value +20 bar [290 psi].
Suction valves
The suction valves allow oil suction to avoid cavitation in the steering cylinder. To provide correct
suction, a back pressure valve must be fitted in the tank line from the steering unit.
Generally Danfoss recommend a back pressure of 2 bar [29 psi], but on vehicles with strong self
straightening tendencies and on articulated steered vehicles, we recommend 5-10 bar [72.5 - 145 psi]. For
further advice, please contact the Danfoss Sales Organization.

26 | © Danfoss | April 2021

BC152886483962en-001003

Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
LS Steering Units OSPB, OSPC, OSPF, OSPD, OSPL
A connection which incorporates a check valve must be established to allow oil flow to by-pass the backpressure valve (and filter) from the tank to steering unit. See diagram examples in sub catalogue “General
Steering Components” page 37 - 39.
T-R
T-L

T-R
T-L

psi

bar

100

7
6

80
5
60

4
3

40

2
20

1

0

Qp

0
0

1

2

3

0

0.25

0.50

0.75

4
1

5

6

1.25

1.50

7
1.75

8
2

9
2.25

10
2.50

11

l/min

Qp
US gal/min

2.75

150-374.10

Check valves
The check valve in the P connection of the steering unit protects the driver against steering wheel jerks.
The check valve prevents oil from flowing backwards into the pump line when steering against a highpressure on the cylinder side. The pressure drop across the check valve is indicated on the following
graph, which assumes the use of port adapters with 11 mm [0.43 in] minimum bore.
′p
psi
90
75

′p
bar
6
5

60

4

45

3

30

2

15

1

0

0

Qp
0
0

10

20
3

30
6

40
9

50
12

60
15

70
18

80

l/min

21

Qp
US gal/min
150-375.11

The check valve in the LS line of OSPC LS and OSPD LS dynamic steering units also protects the driver
against steering wheel jerks. The check valve prevents oil from flowing backwards into the LS line to thepriority valve when steering against a high pressure on the cylinder side.
In OSPF LS oil cannot flow backwards into the LS line, look in sub catalogue: “General Steering
Components “ page 26.

© Danfoss | April 2021

BC152886483962en-001003 | 27

Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
LS Steering Units OSPB, OSPC, OSPF, OSPD, OSPLPort thread versions for OSPB LS, OSPC LS/LSR, OSPF LS, OSPD LS/LSR, OSPL LS, OSPBX LS, OSPCX LS, OSPLX LS
A: G port w. spot face (LS in OSPB and OSPL with novalves)
K: DIN 3852-2 - G 1/4

Amin.Ø21[0.83]
30°

1[0.04]min.12[0.479]

K

150-603.10-A

B: G port w. spot face (LS in OSPC/F/D/Q and OSPL withvalves)
L: DIN 3852-2 - G 1/4

Bmin.Ø28[1.10]
30°

min.12[0.47]

L

150-603.10-B

C: G ports (P, T, L, R)
M: DIN 3852-2 - G 1/2

C
Ø21.5[0.846]

min.15[0.59]

M

150-603.10-C

D: G ports w. spot face (P, T, L, R)
N: DIN 3852-2 - G 1/2

DN

min.15[0.59]

0.6[0.024]

Ø28.6[1.126]
Ø28.3[1.114]

150-603.10-D

28 | © Danfoss | April 2021

BC152886483962en-001003

Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
LS Steering Units OSPB, OSPC, OSPF, OSPD, OSPL
E: Metric port w. spot face and O-ring chamfer (LS)
O: ISO 6149-1 - M12 x 1.5

Emin.Ø26[1.02]
min.Ø22[0.87]30°

1[0.04]min.11.5[0.453]

O

150-603.10-E

F: Metric ports w. spot face and O-ring chamfer (P, T, L, R)
P: ISO 6149-1 - M18 x 1.5

F

Ø28.6[1.126]
Ø28.3[1.114]
min.15[0.59]

0.6[0.024]P

150-603.10-F

G: UNF port w. O-ring chamfer (LS in OSPB and OSPL withno valves)
Q: ISO 11926-1 - 7/16-20UNF O-ring boss portG
min.Ø21[0.83]
30°

min.11.5[0.45]

Q

150-603.10-G

H: UNF ports w. O-ring chamfer (LS in OSPC/ F/D and
OSPL with valves)
R: ISO 11926-1 - 7/16-20 UNF O-ring boss port

H
min.Ø21[0.83]

R

min.11.5[0.45]30°

150-603.10-H© Danfoss | April 2021

BC152886483962en-001003 | 29

Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
LS Steering Units OSPB, OSPC, OSPF, OSPD, OSPL
I: UNF ports w. O-ring chamfer (P, T, L, R)
S: ISO 11926-1 - 3/4-16UNF O-ring boss port

IS

min.15[0.59]

Ø20.8[0.819]

150-603.10-I

30 | © Danfoss | April 2021

BC152886483962en-001003

Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
LS Steering Units OSPB, OSPC, OSPF, OSPD, OSPL
Dimensions
OSPB LS for OLS, OSPBX LS for OSQ
Dimensions for OSPB LS for OLS, OSPBX LS for OSQ
Type

L1mm
[in]

L2mm
[in]

OSPB 50

126 [4.96]

6.5 [0.26]

OSPB 80

129 [5.08]

10.4 [0.41]

OSPB 100

132 [5.20]

13.0 [0.51]

OSPB 125

135 [5.31]

16.2 [0.64]

OSPB/OSPBX 160

140 [5.51]

20.8 [0.82]

OSPB/OSPBX 200

145 [5.71]

26.0 [1.02]

OSPB/OSPBX 250

151 [5.94]

32.5 [1.28]

OSPB/OSPBX 315

160 [6.30]

40.9 [1.61]

OSPB/OSPBX 400

171 [6.73]

52.0 [2.05]

Dimensions for OSPB LS for OLS, OSPBX LS for OSQ

Ø91 [3.58]

47 [1.85]

P

Ø82
Ø81 .3 [3.24
.7 [3.2 0]
17]

max. 87 [3.42]T

44 [1.73]

R

44 [1.73]

Ø44.4 [1.748]
Ø25.4 [1.000]

L

LS

B

A

2.8 [0.110]

L2

min. 7.1 [0.280]

45˚

57 [2.24]

7 [0.28]
29 [1.14]

85 [3.35]

44 [1.73]

L1

102 [4.02]

66 [2.60]

LS64 [2.52]

150-590.11© Danfoss | April 2021

BC152886483962en-001003 | 31

Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
LS Steering Units OSPB, OSPC, OSPF, OSPD, OSPL

32 | © Danfoss | April 2021

European version:

US version:

A: G 1/2; 15 mm [0.59 in] deep

A: 3/4 - 16 UNF O-ring boss; 15 mm [0.59 in] deep

B: M10 × 1.5, 16 mm [0.63 in] deep

B: 3/8 - 16 UNC, 16 mm [0.63 in] deep

LS: G ¼ with spot face, 11 mm [0.43 in] deep

LS: G 7/16 - 20 UNF O-ring boss, 11.5 mm [0.45 in] deep

BC152886483962en-001003

Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
LS Steering Units OSPB, OSPC, OSPF, OSPD, OSPLOSPC LS/LSR and OSPF LS for OLS, OSPCX LS for OSQ© Danfoss | April 2021

Type

L1
mm [in]L2mm [in]OSPC 40

126 [4.96]

6.5 [0.26]

OSPC/OSPF 50

126 [4.96]

6.5[0.26]

OSPC/OSPF 60

128 [5.04]

9.1 [0.36]

OSPC/OSPF 70

128 [5.04]

9.1 [0.36]

OSPC/OSPF 80

129 [5.08]

10.4 [0.41]

OSPC/OSPF 100

132 [5.20]

13.0 [0.51]

OSPC/OSPF 125

135 [5.31]

16.2 [0.64]

OSPC/OSPF OSPCX 160

140 [5.51]

20.8 [0.82]

OSPC/OSPF 185

143 [5.63]

24.0 [0.94]

OSPC/OSPF OSPCX 200

145 [5.71]

26.0 [1.02]

OSPC/OSPF 230

149 [5.87]

29.9 [1.18]

OSPC/OSPF OSPCX 250

151 [5.94]

32.5 [1.28]

OSPC/OSPF OSPCX 315

160 [6.30]

40.9 [1.61]

OSPC/OSPF/OSPCX 400

171 [6.73]

52.0 [2.05]

BC152886483962en-001003 | 33

Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
LS Steering Units OSPB, OSPC, OSPF, OSPD, OSPL
B

Ø8
Ø812.3 [3.7 [ .240
3.2 ]
17]

Ø91 [3.58]

P

47 [1.85]

TLS

max. 87 [3.42]

R

38 [1.50]

L

44 [1.73]

Ø44.4 [1.748]
Ø25.4 [1.000]

A

2.8 [0.110]

L2

min. 7.1 [0.280]
7 [0.28]45˚

57 [2.24]
85 [3.35]

44 [1.73]

29 [1.14]

102 [4.02]

L1

35 [1.38]

LS

51 [2.01]

L

R LS

T

P

150-591.11

34 | © Danfoss | April 2021

European version:

US version:

A: G 1/2 or G 1/2 w. spot faceor M18 x 1.5 ISO 6149,
15 mm [0.59 in] deep

A: 3/4-16 UNF O-ring boss,
15 mm (0.59 in) deep

B: M10 x 1.5, 16 mm [0.63 in] deep

B: 3/8 - 16 UNC or M10 x 1.5, 16 mm [0.63 in] deep

LS: G 1/4 w. spot faceor M12 x 1.5 ISO 6149,
11.5 mm [0.45 in] deep

LS: 7/16 - 20 UNF O-ring boss,
11.5 mm [0.45 in] deep

BC152886483962en-001003

Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
LS Steering Units OSPB, OSPC, OSPF, OSPD, OSPLOSPD LS/LSR for OLS
TypeL1
mm [in]L2mm [in]L3mm [in]OSPD 60/185

191 [7.52]

9.1 [0.36]

16.2 [0.64]

OSPD 60/220

195 [7.68]

9.1 [0.36]

20.8 [0.82]

OSPD 70/195

190 [7.48]

9.1 [0.36]

16.2 [0.65]

OSPD 70/230

195 [7.70]

9.1 [0.36]

20.8 [0.82]

OSPD 70/270

200 [7.87]

9.1 [0.36]

26.0 [1.02]

OSPD 70/385

215 [8.46]

9.1 [0.36]

40.9 [1.61]

OSPD 100/200

191 [7.52]

13.0 [0.51]

13.0 [0.51]

OSPD 100/260

199 [7.83]

13.0 [0.51]

20.8 [0.82]

OSPD 100/300

204 [8.03]

13.0 [0.51]

26.0 [1.02]

OSPD 125/285

202 [7.95]

16.2 [0.64]

20.8 [0.82]

OSPD 125/325

207 [8.15]

16.2 [0.64]

26.0 [1.02]

OSPD 125/440

222 [8.74]

16.2 [0.64]

40.9 [1.61]B

2.8 [0.110]

L3

45˚

L2

min. 7.1 [0.280]
7 [0.28]
29 [1.14]

Ø8
Ø812.3 [3.7 [ .240
3.2 ]
17]

Ø91 [3.58]

P

47 [1.85]

TLS

max. 87 [3.42]

R

38 [1.50]

L

44 [1.73]

Ø44.4 [1.748]
Ø25.4 [1.000]

A

57 [2.24]
85 [3.35]
102 [4.02]

44 [1.73]

L1

35 [1.38]

LS

51 [2.01]
150-593.12© Danfoss | April 2021

European version:

US version:

A: G 1/2 w. spot-face or M18 × 1.5 ISO 6149 15 mm [0.59in] deep

A: 3/4 - 16 UNF O-ring boss; 15 mm [0.59 in] deep

B: M10 × 1.5, 16 mm [0.63 in] deep

B: M 10 × 1.5, 16 mm [0.63 in] deep,

LS: G ¼ w. spot face or M 12 x 1.5 ISO 6149
11.5 mm [0.45 in] deep

LS: 7/16 - 20 UNF o-ring boss, 11.5 mm [0.45 in] deep

BC152886483962en-001003 | 35

Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
LS Steering Units OSPB, OSPC, OSPF, OSPD, OSPLOSPL LS for OLS and OSPLX LS for OSQ
TypeL1
mm [in]L2mm [in]OSPL/OSPLX 520

197 [7.76]

67.8 [2.67]

OSPL/OSPLX 630

211 [8.31]

82.0 [3.23]

OSPL/OSPLX 800

233 [9.17]

104.0 [4.09]

OSPL 1000

263 [10.35]

134.0 [5.27]

Ø91 [3.58]

P

47 [1.85]

T

Ø82
Ø81 .3 [3.24
.7 [3.2 0]
17]

max. 87 [3.42]R

44 [1.73]

L

LS

B

44 [1.73]

Ø44.4 [1.748]
Ø25.4 [1.000]

A

2.8 [0.110]

L2

min. 7.1 [0.280]

45˚

7 [0.28]
44 [1.73]

29 [1.14]

57 [2.24]
85 [3.35]

L1

102 [4.02]

66 [2.60]

LS64 [2.52]
38 [1.50]

LS35 [1.38]

LS

51 [2.01]

P301 030

OSPL LS with pilot pressure relief valve:
European version:

36 | © Danfoss | April 2021

US version:

BC152886483962en-001003

Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
LS Steering Units OSPB, OSPC, OSPF, OSPD, OSPL
A: G 1/2; 15 mm [0.59 in] deep

A: 3/4-16 UNF O-ring boss, 15 mm [0.59 in] deep or for
OVPL

B: M10 x 1.5, 16 mm [0.63 in] deep

B: M10 x 1.5, 16 mm [0.63 in] deep

LS: G 1/4 w. spot face, 11.5 mm [0.45 in] deep

LS: 7/16-20 UNF O-ring boss, 11.5 mm [0.45 in] deep

European version:
A: for OVPL
B: M10 x 1.5, 16 mm [0.63 in] deep
LS: G 1/4 w. spot face, 11.5 mm [0.45 in] deep

© Danfoss | April 2021

BC152886483962en-001003 | 37

Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
LS Steering Units OSPB, OSPC, OSPF, OSPD, OSPLOSPL 1200 LS for OLS
TypeL1
mm [in]L2mm [in]L3mm [in]OSPL 1200 LS

288 [10.34]

104 [4.09]

52 [2.05]

2.8 [0.110]

L3

min. 7.1 [0.280]

L2

7 [0.28]
29 [1.14]

Ø8
Ø812.3 [3.7 [ .240
3.2 ]
17]

Ø91 [3.58]

P

47 [1.85]

TLS

max. 87 [3.42]

R

38 [1.50]

LB

44 [1.73]

Ø44.4 [1.748]
Ø44.35 [1.746]
Ø25.4 [1.000]A

45˚

57 [2.24]
85 [3.35]

44 [1.73]

L1

102 [4.02]

35 [1.38]

LS

51 [2.01]

150-612.10

A: 3/4 - 16 UNF O-ring boss, 15 mm [0.59 in] deep
B: M10 x 1.5, 16 mm [0.63 in] deep
LS: 7/16 - 20 UNF O-ring boss 11.5 mm [0.45 in] deepOSPL
1200 LS for OLS

38 | © Danfoss | April 2021

BC152886483962en-001003

Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
Valve Block OVPLOVPL valve blocks can be flanged onto Danfoss steering units type OSPL, which are prepared for OVPL
mounting.
Versions
OVPL valve blocks contain shock valves, suction valves, check valve and back-pressure valve. OVPL valve
blocks are available with 4, 5 or 7 connections. OVPL with 7 connections have 2 L and 2 R connections,which means that 2 steering cylinders can be connected directly to the valve block.
OVPL, 7 ports
Cylinders

P T

L

R

PP

OVPL,
7 ports

OSPL LS

LS© Danfoss | April 2021

150-685.10

BC152886483962en-001003 | 39

Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
Valve Block OVPL
Code numbers and weightOVPL in the table below have all the following valve functions incorporated:
Check valve in P-port
Shock valves
Suction valves•••

External
connection

OVPL, 5 ports

Sauer-Danfoss
steering unit

L

L

R

R

T
PP
P

T
P
150-628.10

External
connection

OVPL, 7 ports

Sauer-Danfoss
steering unit

L
L

L

R
R
T
PP
P

R
T
P
150-629.10

Valve block

Code numbers

Valve settings

WeightConnections
European version
P, T, L, R: G 1/2-S**
PP: G 1/4-S**

Number of ports Shock valve
bar [psi]

kg [lb]OVPL 24

152-11175240 [3480]

2.0 [4.41]

OVPL 28152-11145280 [4061]

2.0 [4.41]

OVPL 28152-11167280 [4061]

2.0 [4.41]** Spot face around port connections

OVPL in the table below has the following valve functions incorporated:
Check valve in P-port
Shock valves
Suction valves
Backpressure valve, with by-pass to reduce stand-by pressure in neutral position.

••••
40 | © Danfoss | April 2021

BC152886483962en-001003

Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
Valve Block OVPLOVPL, 5 ports and backpressure valve with by-passExternal
connection

Sauer-Danfoss
steering unit

L

L

R

R

T
PP
P

T
P
150-630.10

Valve block

Code numbers

Valve settings

WeightConnections
European version
P, T, L, R: G 1/2-S**
PP: G 1/4-S**

Number of ports Shock valve
bar [psi]

kg [lb]OVPL 24

152-11205240 [3480]

2.0 [4.41]

OVPL 28152-11305280 [4061]

2.0 [4.41]** Spot face around port connections

OVPL in the table below have all the following valve functions incorporated:
Check valve in P-port
Shock valves
Suction valves
Backpressure valve, without by-pass.

•
•
•
•

OVPL, 5 ports and backpressure valve

External
connection

Danfoss
steering unit

L

L

R

R

T
PP
P

T
P
150-631.10© Danfoss | April 2021

BC152886483962en-001003 | 41

Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
Valve Block OVPLOVPL, 7 ports and backpressure valve

External
connection

Danfoss
steering unit

L
L

L

R
R
T
PP
P

R
T
P
150-632.10

Valve block

Code numbers

Valve settings

WeightConnections
European version
P, T, L, R: G 1/2 - S**
PP: G 1/4 - S**

Number of ports Shock valve
bar [psi]

kg [lb]OVPL 24

152-11325240 [3480]

2.0 [4.41]

OVPL 28152-11157280 [4061]

2.0 [4.41]** Spot face around port connections

OVPL in the table below has following valve functions incorporated:• Check valve in P-port• Shock valves• Suction valves
External
connection

OVPL, 4 ports

Danfoss
steering unit

L

L

R

R

T

T

P

P
150-633.10

Valve block

OVPL 28

Code numbers

Valve settings

WeightConnections
US version
3/4 - 16 UNF
O* + S**

Number of ports Shock valve
bar [psi]

kg [lb]152-113342.0 [4.41]

280 [4061]* O-ring chamfer on port connections

42 | © Danfoss | April 2021

BC152886483962en-001003

Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
Valve Block OVPL
Valve block

Code numbers
Connections
US version
3/4 - 16 UNF
O* + S**

Valve settings
Number of ports Shock valve
bar [psi]

Weightkg [lb]** Spot face around port connections

OVPL in the table below has the following valve functions incorporated:
Check valve in P-port
Shock valves
Suction valves
Backpressure valve with by-pass to reduce stand-by pressure in neutral position.

•
•
•
•

OVPL, 4 ports and backpressure valve with by-passExternal
connection

Danfoss
steering unit

L

L

R

R

T

T

P

P
150-634.10

Valve block

OVPL 28

Code numbers

Valve Weight
setti
ngs

Connections
US version
3/4 - 16 UNF
O* + S**

Number of ports Shoc kg [lb]
k
valve
bar
[psi]

152-11364280
2.0 [4.41][4061]* O-ring chamfer on port connections** Spot face around port connections

Technical data
Common data
Common data, refer to General Steering Components Technical Information, BC152886484183.
Valve functions
The data below come from measurements on a representative sample of valve blocks from production.
An oil with a viscosity of 21 mm²/s [SUS] at 50°C [122°F] was used during measuring.
© Danfoss | April 2021

BC152886483962en-001003 | 43

Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
Valve Block OVPL
Valve blockMax. Oil flowl/min [US gal/min]Max. pressure on connections
P, PP
bar [psi]Tbar [psi]L, R
bar [psi]OVPL 24

100 [26.42]

190 [2756]

15 [218]240 [3480]

OVPL 28

100 [26.42]

225 [3263]

15 [218]280 [4061]

Shock valves
The shock valves protect the valve block and steering unit and limit maximum external forces on thesteering cylinder. The shock valves in the valve block limit the maximum pressure drop from L to T andfrom R to T.
The shock valves are set at 10 l/min. [2.64 US gal/min].
The shock valves are of the direct acting type, so they react very quickly.
Setting tolerance: rated value +/- 10 bar [145 psi] , ex. 240 [3480 psi] +/- 10 bar [145 psi].
Suction valves
The suction valves ensure oil suction to avoid cavitations in the steering cylinder. To provide correct
suction, a back pressure valve must be fitted in the tank line from the steering unit.
The capacity of the suction valves can be increased by building in a back pressure in the valve block.
The curve below shows pressure drop across a suction valve
′p
psi

′p
bar
15

200

150

10

100
5
50

0

0

0
0

10
2

20
4

30
6

8

40
10

50
12

60
14

Qp
l/min

Qp
16 US gal/min
152-150.10

Check valve
The check valve protects the driver against steering wheel jerks. The check valve prevents oil fromflowing backwards into the pump line when steering against a high pressure on the cylinder side.
The check valve is built into the P connection of the valve block.
The curve below shows pressure drop across the check valve in p-connection

44 | © Danfoss | April 2021

BC152886483962en-001003

Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
Valve Block OVPL
′p

′p

psi

bar

60

4

50
3
40
30

2

20
1
10
0

0
0
0

10
2

20
4

30
6

40

8

10

50
12

60
14

16

70
18

80
20

90

100

24

26

22

110

Qp
l/min
Qp
US gal/min

28

152-152.10

Backpressure valve
A backpressure valve increases the capacity of the suction valves.
The curve below shows pressure drop for backpressure valve without by-pass.
′p
psi
300

′p
bar
20

250
200
150

15

10

100
5
50
0

Qp

0
0

10

20

30

0

2.5

5

7.5

40
10

50
12.5

60
15

70
17.5

80
20

90
22.5

100 l/min
25

Qp
US gal/min
152-151.10

The curve below shows pressure drop for backpressure valve with by-pass.
′p
psi
300

′p
bar
20

250
200
150

15

10

100
5
50
0

Qp

0
0

10

20

30

0

2.5

5

7.5

40
10

50
12.5

60
15

70
17.5

80
20

90
22.5

100 l/min
25

Qp
US gal/min
152-178.10© Danfoss | April 2021

BC152886483962en-001003 | 45

Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
Valve Block OVPL
Installation
Connection P in the valve block must be placed over the connection P in the steering unit, so OVPL isprovided with a positioning pin to fit the positioning hole in the steering unit.
The valve block is supplied inclusive of 2 mounting screws and 4 O-rings for building onto the steering
unit.
Tightening torque 65 ±5 N•m [575 ±44 lbf•in]. It is only allowed to mount OVPL blocks on steering units
with a flat port flange, no spot face is allowed.
Dimensions
92 [3.62]

16 [0.63]

51 [2.01]

28 [1.10]

BYX

44 [1.73]

95 [3.74]

OVPL, 5 ports
European version:
P, T, L and R:
G 1/2 w. spot face,
15 mm [0.59 in] deep
PP: G 1/4, w. spot face,
11,5 mm [0.45 in] deep
X: 30,2 +0,2
Y: 21,3 +/- 0,2
OVPL, 4 ports (no PP)
US version:
P, T, L and R:
3/4-16 UNF O-ring boss
15 mm [0.59 in] deep
X: 30.2 +0.2
B: Positioning pin premounted in OVPL

29 [1.14]

44 [1.73]

102 [4.02]
152-149.10

46 | © Danfoss | April 2021

BC152886483962en-001003

Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
Valve Block OVPL
92 [3.62]
28 [1.10]

16 [0.63]

51 [2.01]

OVPL, 7 ports
European version:
P, T, 2xL and 2xR:
G 1/2 w. spot face,
15 mm [0.59 in] deep
PP: G 1/4, w. spot face,
11.5 mm [0.45 in] deep
X: 30.2 +0.2
Y: 21.3 +/- 0.2
B: Positioning pin premounted in OVPL

BY

44 [1.73]

92 [3.62]

X

21.5 [0.85]

44 [1.73]

X

29 [1.14]

50 [1.97]
102 [4.02]
152-148.10© Danfoss | April 2021

BC152886483962en-001003 | 47

Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow AmplifiersAngle Block OVROVR angle blocks are especially designed for applications in which pipes and/or hoses must run parallelwith the steering column axis, and where space is limited.
The valve block can be flanged onto Danfoss steering unit OSPB, OSPC, OSPD, OSPF, OSPQ and OSPL,
which have no spot face around the ports.
Use the angle block makes angle and swivel connections and pipe bends unnecessary.
The OVR connections are positioned away from the steering wheel. (see Dimensions on page 49)
Version
OVR

L

L

R

R

T

T

P

P
150-635.10

Code numbers and weightOVR in the table below has no valve functions incorporated.
Angle block

OVR

Code numbers

WeightConnections
European version
P, T, L, R: G 1/2
S**

kg [lb]152-0201

2.0 [4.41]

S** : Spot face around port connections
Installation
The valve block is supplied inclusive of 2 mounting screws and 4 O-rings for building onto the steering
unit.
Tightening torque 65 ±5 N•m [575 ±44.3 lbf•in]. OVR blocks may only be mounted on steering units witha flat port flange, (no spot facing).
For OVR blocks with other thread ore kind of valves mounted, please contact the Danfoss Sales
organization.

48 | © Danfoss | April 2021

BC152886483962en-001003

Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow AmplifiersAngle Block OVR
Dimensions
OVR
rmax. 0.5 [0.20]

2.5 [0.098] max.

91 [3.58]
100 [3.94]

106 [4.17]

38 [1.50]

140 [5.51]

Ø29.4 [1.158]
Ø29.0 [1.143]

15 [0.59]

25 [0.98]
46 [1.81]

152-31.10

European version:

G 1/2, 15 mm [0.59 in] deepP, T, L and R:© Danfoss | April 2021

BC152886483962en-001003 | 49

Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
Priority Valves OLSA, OLS, and OLSP
Versions
Danfoss priority valves are used in steering systems with load sensing steering units. In such systems
steering always has first priority
Load sensing static priority valves
Load sensing static steering units require load sensing static priority valves. Load sensing static steeringsystems have no oil flow in the LS connection when the steering unit is in neutral position.
Load sensing dynamic priority valves
Load sensing dynamic steering units require load sensing dynamic priority valves. Load sensing dynamic
steering systems have a constant oil flow in the LS connection from the priority valve to the steering unit
even when the steering unit is in neutral position.
Ports:
P = pump,
CF = controlled flow (priority oil flow),
EF = excess flow,
L = left,
R = right,
T = tank,
LS = load sensing,
PP = pilot pressure

50 | © Danfoss | April 2021

BC152886483962en-001003

Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
Priority Valves OLSA, OLS, and OLSPOLSA 40/80
The OLSA 40 and OLSA 80 “flange on” priority valves are used in load sensing steering systems, built onto
OSPC LS (OLSA) steering units.

OLSA static

OLSA dynamic
LS

L

L

CF

T

LS
R

R

L

L

CF

T

C
A
P

T

EF

P

152B135.11

R

R

B
T

EF
152B170.11

A: PP-damping orifice
B: LS-orifice
C: Dynamic-orifice© Danfoss | April 2021

BC152886483962en-001003 | 51

Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
Priority Valves OLSA, OLS, and OLSPOLS 40/80 and OLS 120
The OLS 40, OLS 80, and OLS 120 “in line” priority valves are used in load sensing steering systems
together with OSPB LS, OSPC LS, OSPF LS, OSPD LS, OSPU LS and OSPL LS steering units.
OLS 40/80

OLS 120

OLS static

OLS dynamic
CF

CF

EF

EF
LS

LS
P

P
152B134.10

52 | © Danfoss | April 2021

152B171.10

BC152886483962en-001003

Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
Priority Valves OLSA, OLS, and OLSPOLS 160
The OLS 160 “in line” priority valve is used in load sensing steering systems together with OSPB LS, OSPCLS, OSPF LS, OSPD LS, OSPU LS and OSPL LS steering units.
OLS 160

OLS static

OLS dynamic
CF

EF

LS

CF

EF

LS

PP

P

T
152B137.11

PT
152B172.11

OLS 160 is also available without pilot pressure relief valve.

© Danfoss | April 2021

BC152886483962en-001003 | 53

Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
Priority Valves OLSA, OLS, and OLSPOLSP 80
The priority valve OLSP 80 is to be used in connection with e.g. Danfoss gear pumps type SNP andsteering units type OSPB LS, OSPC LS, OSPF LS, OSPD LS and OSPU LS in load sensing steering systems,
where maximum oil flow does not exceed 80 l/min [21.7 US gal/min].
OLSP 80 priority valves are to be flanged on gear pumps with outlet ports square flange type 35 (35 mm
pitch diameter of 4x M6 bolt holes for fixing the priority valve on pump).
OLSP

OLS 80 static

OLS 80 dynamic

CF

CF

EF

EF
LS

LS
P

P
152B134.10

54 | © Danfoss | April 2021

152B171.10

BC152886483962en-001003

Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
Priority Valves OLSA, OLS, and OLSPOLS 320The OLS 320 “in line” priority valve is used together with OSPB LS, OSPC LS, OSPF LS, OSPD LS, OSPU LS
and OSPL LS in load sensing steering systems with pump flow up to 320 l/min [84.5 USgal/min].

OLS 320 static

OLS 320 dynamic
CF

EF

P

LS

T
152B172.11© Danfoss | April 2021

BC152886483962en-001003 | 55

Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
Priority Valves OLSA, OLS, and OLSPOLS 320 without pilot pressure relief valve
OLS 320 is also available without pilot pressure relief valve.
EHPS steering valve has build in priority valve, but for max. pump flow 120 l/min [31.7 USgal/min] In
systems with EHPS and pump flow between 120 l/min [31.7 USgal/min] and 320 l/min [84.5 USgal/min] a
combination of EHPS and OLS 320 gives a good compact solution to reduce hosing and installation costcompared with stand alone components. For further details of this OLS 320: look in EHPS Steering Valvewith PVE Electrical Actuation Module and OSPCX CN Steering Wheel Technical Information,
BC152886484652.

EHPS
CL

type 0

CR

L
R

Ps

Ts

P

T

EF

LS

LS
OLS 320PEFP301 025

56 | © Danfoss | April 2021

BC152886483962en-001003

Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
Priority Valves OLSA, OLS, and OLSP
System sizing
The steering system pump is sized so that satisfactory performance is achieved for both steering andworking hydraulics - even at idle.
Before selecting a priority valve, consider
the type of steering unit (LS static, LS dynamic or OSPF LS dynamic)

•
•
•
•
•

the displacement of the steering unit
the pump flow
the application’s requirement for energy optimization, initial steering response time and stability, as
these all govern the selection for control spring pressure
whether the priority valve should have internal PP (Pilot Pressure) or external PP-connection depends
on the pressure drop in the pump line between the priority valve’s CF-port (Controlled Flow) and thesteering unit’s P-port. With normal hose and tube dimensions and less than 5 m distance between
priority valve and steering unit, the immediate choice is normally a priority valve with internal PP.

The following survey lists the code numbers of the priority valves that are the most frequently used inconnection with the above Danfoss steering unit types. All priority valves in the code number tables,
except OLS 160 static, have internal PP connection. OLS 160 static in the code number table all haveexternal PP connection.
Code numbers and weights
OLS/OLSA static priority valves for load sensing static steering units
OLSA 40 static and OLSA 80 static
Priority valve

Code Numbers
Connections

Control springpressurebar [psi]

Weightkg [lb]European version
T,R,L: G 3/8
P, EF: G 1/2

US version
T, R, L: 9/16 - 18 UNF
P, EF: 7/8 - 14 UNF

OLSA 40

152B0001-

4 [58]

2.1 [4.63]

OLSA 40

152B0002

152B0122

7 [101.5]

2.1 [4.63]

OLSA 40

152B0003

152B0124

10 [145]

2.1 [4.63]

OLSA 80152B0016

152B0019

4 [58]

2.1 [4.63]

OLSA 80152B0017

152B0020

7 [101.5]

2.1 [4.63]

OLSA80

152B0015

152B0125

10 [145]

2.1 [4.63]

Control springpressurebar [psi]

Weightkg [lb]

OLS 40 static and OLS 80 static
Priority valve

Code Numbers
Connections© Danfoss | April 2021

European version
LS: G 1/4
P, EF, CF: G 1/2

US version
LS: 7/16 - 20 UNF
CF: 3/4 - 16 UNF
P, EF: 7/8 - 14 UNF

OLS 40

152B0231

152B0237

4 [58]

1.0 [2.2]

OLS 40

152B0232

152B0238

7 [101.5]

1.0 [2.2]

OLS 40

152B0233

152B0253

10 [145]

1.0 [2.2]

OLS 80

152B0261

152B0267

4 [58]

1.0 [2.2]

BC152886483962en-001003 | 57

Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
Priority Valves OLSA, OLS, and OLSPOLS 40 static and OLS 80 static (continued)
Priority valve

Code Numbers

Control springpressurebar [psi]

Connections
European version
LS: G 1/4
P, EF, CF: G 1/2

Weightkg [lb]

US version
LS: 7/16 - 20 UNF
CF: 3/4 - 16 UNF
P, EF: 7/8 - 14 UNF

OLS 80

152B0262

152B0268

7 [101.5]

1.0 [2.2]

OLS 80

152B0263

152B0280

10 [145]

1.0 [2.2]

OLS/OLSA static priority valves for load sensing statics steering units
OLS 120 static
Priority valve

Code Numbers
Connections

Control springpressurebar [psi]

Weightkg [lb]European version
LS: G 1/4
CF: G 1/2
P, EF: G 3/4

US version
LS: 7/16 -20 UNF
CF: 3/4 - 16 UNF
P, EF: 1 1/16 - 12 UNF

OLS 120152B2232

152B2238

7 [101.5]

2.1 [4.63]

OLS 120152B2233

152B2239

10 [145]

2.1 [4.63]

OLS 160 static
Priority valve

Code numbers
Connections

Controlspringpressurebar [psi]

Pilotpressure
reliefvalve
bar [psi]

Weightkg [lb]European version
LS, PP, T: G 1/4
CF: G 1/2
P, EF: G 3/4

US version
LS, PP, T: 7/16 -20 UNF
CF: 3/4 - 16 UNF
P, EF: 1 1/16 - 12 UNF

OLS 160

152B1005

152B1085

7 [101.5]

170 [2465]

4.4 [9.7]

OLS 160

152B1006

152B1086

10 [145]

170 [2465]

4.4 [9.7]

OLS/OLSA dynamic priority valves for load sensing dynamic steering units
OLSA 40 dynamic and OLSA 80 dynamic for OSPC LS dynamic
Priority valve

Code numbers
Connections

58 | © Danfoss | April 2021

Control springpressurebar [psi]

Weightkg [lb]European version
T,R,L: G 3/8
P/EF: G 1/2

US version
T,R,L: 9/16 - 18 UNF
P/EF: 7/8 - 14 UNF

OLSA 40

152B8001-

4 [58]

2.1 [4.63]

OLSA 40

152B8041

152B8042

7 [101.5]

2.1 [4.63]

OLSA 40

152B8046

152B8043

10 [145]

2.1 [4.63]

OLSA 80152B8047-

4 [58]

2.1 [4.63]

OLSA 80152B8048

152B8044

7 [101.5]

2.1 [4.63]

OLSA 80152B8049

152B8045

10 [145]

2.1 [4.63]

BC152886483962en-001003

Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
Priority Valves OLSA, OLS, and OLSP
OLS/OLSA dynamic priority valves for load sensing dynamic steering units
OLS 40 dynamic and OLS 80 dynamic for OSPB, OSPC, OSPD and OSPL LS dynamic
Priority valve

Code numbers

Control springpressurebar [psi]

Connections
European version
LS: G 1/4
P, EF, CF: G 1/2

Weightkg [lb]

US version
LS: 7/16 - 20 UNF
CF: 3/4 - 16 UNF
P, EF: 7/8 - 14 UNF

OLS 40152B8231-

4 [58]

1.0 [2.20]

OLS 40152B8232

152B8253

7 [101.5]

1.0 [2.20]

OLS 40152B8233

152B8254

10 [145]

1.0 [2.20]

OLS 80152B8261-

4 [58]

1.0 [2.20]

OLS 80152B8256

152B8268

7 [101.5]

1.0 [2.20]

OLS 80152B8257

152B8260

10 [145]

1.0 [2.20]

OLS 80 dynamic with low pressure drop (P-EF) spool for OSPB, OSPC, OSPD and OSPL LS dynamic
Priority valve

Code numbers
Connections

Control springpressurebar [psi]

Weightkg [lb]7 [101.5]

1.0 [2.20]

Control springpressurebar [psi]

Weightkg [lb]European version
LS: G 1/4
P, EF, CF: G 1/2
OLS 80152B8259

OLS 120 dynamic for OSPB, OSPC, OSPD and OSPL LS dynamic
Priority valve

Code numbers
Connections
European version
LS: G 1/4
CF: G 1/2
P, EF: G 3/4

US version
LS: 7/16 -20 UNF
CF: ¾ - 16 UNF
P, EF: 1 1/16 - 12 UNF

OLS 120152B8132

152B8143

7 [101.5]

2.1 [4.63]

OLS 120152B8133

152B8144

10 [145]

2.1 [4.63]

OLS 160 dynamic for OSPB, OSPC, OSPD and OSPL LS dynamic
Priority valve

Code numbers
Connections© Danfoss | April 2021

Controlspringpressurebar [psi]

Pilotpressure
reliefvalve
bar [psi]

Weightkg [lb]European version
LS, T: G 1/4
CF: G 1/2
P, EF: G 3/4

US version
LS, T: 1/16 -20 UNF
CF: 3/4 - 16 UNF
P, EF: 1 1/16 - 12 UNF

OLS 160

152B8159

152B8154

7 [101.5]

170 [2465]

4.4 [9.7]

OLS 160

152B8160

152B8155

10 [145]

170 [2465]

4.4 [9.7]

OLS 160

152B8105-

12 [174]

170 [2465]

4.4 [9.7]

OLS 160

152B8161

152B8156

7 [101.5]

210 [3045]

4.4 [9.7]

OLS 160

152B8162

152B8157

10 [145]

210 [3045]

4.4 [9.7]

BC152886483962en-001003 | 59

Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
Priority Valves OLSA, OLS, and OLSPOLS dynamic priority valves for OSPF LS and OSPU LS dynamic steering units
OLS 40 dynamic and OLS 80 dynamic
Priority valve

Code numbers
Connections

Control springpressurebar [psi]

Weightkg [lb]European version
LS: G 1/4
P, EF, CF: G 1/2
OLS 40152B8031

10 [145]

1.0 [2.20]

OLS 80152B8258

7 [101.5]

1.0 [2.20]

Code numbers

Control springpressurebar [psi]

Weightkg [lb]7 [101.5]

2.1 [4.63]

Controlspringpressurebar [psi]

Pilot pressure
relief valve
bar [psi]

Weightkg [lb]

OLS 120 dynamic
Priority valve

Connections
European version
LS: G 1/4, CF: G 1/2
P, EF, CF: G 3/4
OLS 120152B8147

OLS 160 dynamic
Priority valve

Code numbers
Connections
European version
LS: G 1/4, CF: G 1/2
P, EF, CF: G 3/4

OLS 160

152B8158

7 [101.5]none

4.4 [9.7]

OLS 160

152B8113

10 [145]none

4.4 [9.7]

OLSP static and dynamic
Priority valve

Code numbers
Connections
European version
LS: G¼
CF: G 3/8
EF: G ½

60 | © Danfoss | April 2021

Controlspringpressurebar [psi]

Weightkg [lb]OLSP 80 static

152B5002

4 [58]

1.0 [2.2]

OLSP 80 dynamic

152B5200

7 [101.5]

1.0 [2.2]

OLSP 80 dynamic for OSPF and
OSPU

152B5201

7 [101.5]

1.0 [2.2]

BC152886483962en-001003

Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
Priority Valves OLSA, OLS, and OLSPOLS 320 dynamic in-line/stand alone with pilot pressure relief valve, black painted
Priority valve

Code numbers
Connections
European version
LS, T: G¼
CF: G ½
P, EF: G 1

OLS 32011006593

Controlspringpressurebar [psi]

Pilotpressure
relief valve
bar [psi]

Weightkg [lb]7 [101.5]

170 [2465]

5.9 [13.0]

OLS 320 dynamic in-line/stand alone without pilot pressure relief valve, black painted
Priority valve

Code numbers
Connections

Control springpressurebar [psi]

Weightkg [lb]10 [145]

5.9 [13.0]

US version
LS: 7/16 - 20 UNF
CF: 11/16 - 12 UN
P, EF: 15/16 - 12 UN
OLS 32011007475

OLS 320 for EHPS: look in EHPS Steering Valve with PVE Electrical Actuation Module and OSPCX CN Steering
Wheel Technical Information, BC152886484652
If you require other port connections, other control spring pressure and/or other PP connection, go to thesurvey under System sizing on page 57, and tick off the desired specifications, then consult the Danfoss
Sales Organization.

© Danfoss | April 2021

BC152886483962en-001003 | 61

Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
Priority Valves OLSA, OLS, and OLSP
Specification table for non catalogue numbers of Danfoss Priority ValvesYour
company

Name

VehicleYourapplication

Pump flow to OLS/OLSA at idle, l/min [USgal/min]Priority valve OLSA 40
type

OLSA 80

Potential, pcs/year

OLS 40

Load sensing Static
type

Completed by

Date

Pump flow to OLS/OLSA at max. engine speed, l/min [USgal/min]

OLS 80

OLS 120

Dynamic

OLS 160

OLSP 80

OLS 320 in-line

Dynamic for OSPF and OSPU steering unit

Spool type

Standard

Low pressure drop, P-EF (only OLS/OLSA 80 dynamic)

Controlspring, bar

4 (only OLS 80, 120, 160, OLSP
80)

PP
connection

Internal

Ports,OLSA

G: P, EF: G½ - S**
T, L, R: G3/8 - S**

Ports,
OLS 40/80

P, CF, EF: G½ - S**
G: LS: G½ - S**

P, EF: M22 • 1.5 - O*** +S**
Metric: CF: M18 • 1.5 - O*** +S**
LS: M12 • 1.5 - O*** +S**

P, EF: 7/8 - 14 UNF - O***UNF: CF: 3/4 - 16 UNF - O***
LS: 7/16 - 20 UNF - O***

Ports,
OLS 120

P, EF: G¾ - S**
G: CF: G½ - S**
LS, PP: G¼ - S**

P, EF: M27 • 2 - O*** +S**
Metric: CF: M18 • 1.5 - O*** +S**
LS: M12 • 1.5 - O*** +S**

P, EF: 11/16 - 14 UNF - O***UNF: CF: 3/4 - 16 UNF - O***
LS: 7/16 - 20 UNF - O***

Ports,
OLS 160

P, EF: G¾ - S**
G 1: CF: G½ - S**
LS, PP, T: G¼ - S**

5.5 (only OLS/OLSA 40/80)

No CF cut-off (only for OLS 320 for flanging on EHPS)

71012 (only OLS 160) 16 (only OLS
160)External (not OLSP)

Metric 1: P, EF, T, L, R:
M18 • 1.5 -O*** +S**

Metric 2: P, EF: M22 • 1.5 - O***+S**
T, L, R: M18 • 1.5 - O*** +S**

P, EF: G1 - S**
G 2: CF: G¾ - S**
LS, PP, T: G¼ - S**

P, EF: 11/16 - 12 UN - O***UNF 1: CF: 3/4 - 16 UNF - O***
LS, PP, T: 7/16 - 20 UNF - O***UNF: P, EF: 7/8 - 14 UNF - O***
T, L, R : 9/16 - 18 UNF - O***

P, EF:15/16 - 12 UN - O***UNF 2: CF: 7/8 - 14 UNF - O***
LS, PP, T: 7/16 - 20 UNF - O***

Ports, OLSP
EF: G½ - S**
80 (P: square G: CF: G3/8 - S**flange 35)
LS: G¼ - S**

EF: M22 • 1.5 - S**
Metric: CF: M18 • 1.5 - S**
LS: M12 • 1.5 - S**

EF: 7/8 - 14 UNF - O***UNF: CF: 3/4 - 16 UNF - O***LS : 7/16 - 20 UNF - O***

Ports, OLS
320 in-line

P, EF: G1 - S**
G: CF: G½ - S**
LS, PP: G¼ - S**

P, EF: 1 5/16 - 12 UN - O***UNF 1: CF: 3/4 - 16 UNF - O***
LS, PP, T: 7/16 - 20 UNF - O***

P, EF: 1 5/16 - 12 UN - O***UNF 2: CF: 1 1/16 - 12 UNF - O***
LS, PP, T: 7/16 - 20 UNF - O***

RV-barOLS 160
OLS 32080

Unit black
painted

Yes

90

100

110

120

140

170

190

200

210

Other settings

No relief valve
barNo

Ports: PP-port only exists when external PP connection is used. T-port only exists for OLS 160 and OLS 320
with integrated pilot pressure relief valve (RV)O*: O-ring chamfer on port connections
62 | © Danfoss | April 2021

BC152886483962en-001003

Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
Priority Valves OLSA, OLS, and OLSP
S**: Spot face around port connections
An alternative way to specify a variant is to state an existing code number and add the modifications, you
would like to have implemented in the basic steering unit.
Code number of basic steering unit: __________________________________________________
Requested modifications:_______________________________________________________________________
Technical data
Max. pressure on connections
Priority
valve

Rated flow
to Pconnection

Max. pressure on connections
P, EF

CF

L, R

LS

T

PP

l/min [USgal/min]bar [psi]bar [psi]bar [psi]bar [psi]bar [psi]bar [psi]

OLSA 4040 [10.57]

250 [3625]

240 [3480]

280 [4061]

240 [3480]

20 [290]--

OLSA 80

80 [21.13]

250 [3625]

240 [3480]

280 [4061]

240 [3480]

20 [290]--

OLS 4040 [10.57]

280 [4061]

240 [3480]--

240 [3480]--

210 [3045]

OLS 8080 [21.13]

280 [4061]

240 [3480]--

240 [3480]--

210 [3045]

OLS 120120 [31.70]

300 [4351]

240 [3480]--

240 [3480]--

210 [3045]
210 [3045]

OLS 160

160 [42.27]

350 [5076]

240 [3480]--

240 [3480]

15 [217]

OLSP 80

80 [21.13]

280 [4061]

240 [3480]--

240 [3480]----

OLS 320320 [84.54]

300 [4351]

280 [4061]--

280 [4061]

40 [580]

280 [4061]

Pressure drop in priority valves
This data comes from measurements on a representative sample of priority valves from production. Oilwith viscosity of 21 mm²/s at 50 °C [102 SUS at 122 °F] was used during measuring. Measurement madewhen pressure on the LS connection is zero (steering unit in neutral position). The minimum curves apply
when the pressure on the EF connection is higher than the actual control spring pressure. The curves forcontrol spring pressure of 4 , 7, 10 or 12 bar [58, 101, 145 or 174 psi] apply when pressure on the EF
connection is zero.
Pressure drop P-EF for static priority valves
OLSA/OLS 40
P-EF

P-EF

psi

bar

200

14

175

12

150

10

125

10 bar145 psi

7 bar
102 psi

8

100

4 bar
58 psi

6
75
50

4

25

2

0

0

min

Qp
0
0

5
1

10
2

15
3

4

20
5

25
6

30
7

8

35
9

40
10

l/min

Qp
US gal/min
152B139.11© Danfoss | April 2021

BC152886483962en-001003 | 63

Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
Priority Valves OLSA, OLS, and OLSPOLSA/OLS 80
P-EF
psi
225

P-EF
bar
16

200

14

175

12

150

10

125
100
75
50

10 bar145 psi
7 bar
102 psi
4 bar
58 psi
min.

8
6
4

25

2

0

0
0
0

10

20

2

4

30
6

40

8

10

50
12

60
14

70

16

Qp

80

18

l/min

Qp
US gal/min

20

152B80.11

OLS 120
P-EF
psi

225

P-EF

bar

16

200

14

175

12

150

10

125
100

10 bar145 psi
7 bar
102 psi

8
6

min

75
50
25
0

4
2
0
0
0

10

20
5

30

40
10

50

60
15

70

80
20

90

100
25

110

120
30

Qp
l/min

Qp
US gal/min
152B165.11

64 | © Danfoss | April 2021

BC152886483962en-001003

Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
Priority Valves OLSA, OLS, and OLSPOLS 160
P-EF
psi

P-EF
bar
20

275

12 bar
174 psi

18

250
225

16

200

14

175

12

150

10

125

10 bar145 psi
7 bar
102 psi
min

8

100

6

75
50

4

25

2

0

0
0

10

0

20

30

40

5

50

10

60

70

15

80

90

20

100

110

25

120

130

30

140

35

150

Qp
l/min

160

Qp
US gal/min

40

152B166.10

Pressure drop P-EF for dynamic priority valves
OLSA/OLS 40
P-EF

P-EF

psi

bar

225

16

200

14

175

12

150

10

125
100
75
50

10 bar145 psi
7 bar
102 psi

84 bar
58 psi

6
4

25

2

0

0

min

0
0

5
1

10
2

15
3

4

20
5

25
6

30
7

8

35
9

40
10

Qp
l/min
Qp
US gal/min
152B174.10© Danfoss | April 2021

BC152886483962en-001003 | 65

Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
Priority Valves OLSA, OLS, and OLSPOLSA/OLS 80
P-EF

P-EF

psi

bar
20

275

10 bar145 psi

18

250
225

16

200

14

175

12

150

10

125

A+B

7 bar
102 psi
4 bar
58 psi

A+B

100

min

A+B

8

min

6

75
50

4

25

2

0

0

A
B
0

10

0

20

2

4

30
6

40

8

10

50
12

60
14

70

16

Qp
l/min

80

18

Qp
US gal/min

20

152B175.10

A: OLS/OLSA 80 Dynamic for OSPB, OSPC, OSPF, OSPD, OSPQ, OSPL LS Dynamic
B: OLS/OLSA 80 Dynamic with low pressure drop (P-EF) spool for OSPB, OSPC, OSPD, OSPQ, OSPL LS
Dynamic
OLS 120
P-EF
psi

P-EF

bar

20
275
250
225

16

200

14

175

12

150

10

125

8

100
75
50
25
0

10 bar145 psi
7 bar
102 psi

18

7 bar
102 psi

A
B
A

min

6
4
2

A+B

0
0
0

10

20
5

30

40
10

50

60
15

70

80

90

20

100
25

110

120
30

Qp
l/min

Qp
US gal/min
152B176.10

A: OLS 120 Dynamic for OSPB, OSPC, OSPD, OSPQ, OSPL LS Dynamic
B: OLS 120 Dynamic for OSPF LS Dynamic and for OSPU LS Dynamic

66 | © Danfoss | April 2021

BC152886483962en-001003

Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
Priority Valves OLSA, OLS, and OLSPOLS 160
P-EF
psi

P-EF

450

bar
32

400

28

350

24

300
250
200
150

12 bar
174 psi

A

20

B

A

16
12

100

8

50

4

0

0

10 bar145 psi
7 bar
102 psi
7 bar
102 psi
min

A
A+B
0

10

20

0

30

40

5

50

10

60

70

15

80

90

20

100

110

25

120

30

130

140

35

150

160

Qp
l/min
Qp
US gal/min

40

152B177.10

A: OLS 160 Dynamic for OSPB, OSPC, OSPD, OSPL LS Dynamic
B: OLS 160 Dynamic for OSPF LS and for OSPU LS Dynamic
Pressure drop P-EF for OLSP static priority valves
OLSP 80
P-EF

P-EF

psi
175

bar
12

150

10

125

7 bar
102 psi
4 bar
58 psi
min

8

100
6
75
50

4

25

2

0

0

Qp
0

10

0

2

20
4

30
6

40
8

50
10

60
12

70
14

80
16

l/min

Qp
18 US gal/min
152-181.10© Danfoss | April 2021

BC152886483962en-001003 | 67

Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
Priority Valves OLSA, OLS, and OLSP
Pressure drop P-EF for OLSP dynamic priority valves
P-EF

P-EF

psi
175

bar
12

150

10

125

7 bar
102 psiB
4 bar
58 psi

A

8

min

100
6

A

75
50

4

25

2

0

0

A+B
0

10

0

2

20

30

4

40

6

8

50

60

10

12

70
14

80

Qp
l/min
Qp
18 US gal/min

16

152-182.10

A: OLSP 80 Dynamic for OSPB, OSPC, OSPD, OSPL LS Dynamic
B: OLSP 80 Dynamic for OSPF LS and for OSPU LS Dynamic
Pressure drop P-EF for OLS 320 static priority valves
OLS 320
P-EF
psi
250
225

P-EF
bar
18

200

14

175

12

150

10

125

8

100
75
50

10 bar145 psi

16

7 bar
102 psi

min.

6
4

25

2

0

0

Qp
0

20

40

60

80

100

120

0

5

10

15

20

25

30

140
35

160
40

180
45

200
50

55

220
60

240

260

280

300

320 l/min

65

70

75

80

Qp
85 US gal/min
152B185.10

68 | © Danfoss | April 2021

BC152886483962en-001003

Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
Priority Valves OLSA, OLS, and OLSP
Pressure drop P-EF for OLS 320 dynamic priority valves
OLS 320
P-EF
psi
450

P-EF
bar
30

10 bar145 psi

400
350
300

25
7 bar
102 psi

20

250
200
150

15
10

min

100
5

50
0

Qp

0
0

20

40

60

80

100

120

0

5

10

15

20

25

30

140
35

160
40

180
45

200
50

55

220
60

240

260

280

300

320 l/min

65

70

75

80

Qp
85 US gal/min
152B186.10

OLS 160 and OLS 320, pilot pressure relief valve (P - T, Qp) characteristics
OLS 160 and OLS 320 with pilot pressure relief valves are used in connection with Danfoss steering units
without pilot pressure relief valve, normally steering unit type OSPL. The pilot pressure relief valve
protects the steering unit against excessive pressure. The pilot pressure relief valve in OLS 160/320
operates with the priority valve spool in the OLS 160/320 to limit the maximum steering pressure P-T
measured across the steering unit ports.
OLS 160:The pilot pressure relief valve is set when an oil flow of 80 l/min [21 US gal/min] is supplied to
OLS 160.
OLS 320:The pilot pressure relief valve is set when an oil flow of 40 l/min [11 US gal/min] is supplied to
OLS 320.
OLS 160 and OLS 320: Setting tolerance: rated value +10 bar [145 psi]
OLS 160
P-T
psi
2800

P-T
bar
190

2700
2600
2500

180

170

2400
2300
2200
0

160

150
0

0
0

10

20
5

30

40
10

50

60
15

70

80
20

90

100
25

110
30

120

130

140

35

150
40

160

Qp
l/min
Qp
US gal/min
152B141.11© Danfoss | April 2021

BC152886483962en-001003 | 69

Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
Priority Valves OLSA, OLS, and OLSPOLS 320
HP-HT HP-HT
psi
3000
2900

bar
210
200

2800
2700

190

2600

180

2500
2400
2300
2200
2100
0

170
160
150

Qp

0
0

40

0

10

80
20

120
30

160
40

200
50

240
60

280
70

320 l/min
80Qp
US gal/min
152B187.10

Qp = Pump flow

70 | © Danfoss | April 2021

BC152886483962en-001003

Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
Priority Valves OLSA, OLS, and OLSP
Dimensions
OLSA
44 [1.73]

Y

29 [1.14]

YRL

7 [0.28]

120 [4.72]

X

87 [3.43]

L

87 [3.43]

P

T

R/CF

EF

EF

20 [0.79]
55 [2.17]

20 [0.79]

29 [1.14]

P

T
X© Danfoss | April 2021

40 [1.57]
76 [2.99]

44 [1.73]

Y

152B81.12

BC152886483962en-001003 | 71

Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
Priority Valves OLSA, OLS, and OLSP

72 | © Danfoss | April 2021

European version:

US version:

P, EF:
G 1/2 w. spot face
14 mm [0.55 in] deepx = 34 mm [1.34 in],max. 1,5 mm [0.06 in] deep or M18 x 1.5 ISO 6149
14.5 mm [0.57 in] deepx = 29 mm [1.14 in],max. 1.5 mm [0.06 in] deep or M22 x 1.5 ISO 6149,
15.5 mm [0.61 in] deepx = 34 mm [1.34 in],max. 1.5 mm [0.06 in] deepP, EF:
7/8-14 UNF O-ring boss
16.7 mm [0.66 in] deepx = 34 mm [1.34 in],max. 1.5 mm [0.06 in] deep

T, L, R:
G 3/8 w. spot face
12 mm [0.47 in] deepy = 34 mm [1.34 in],max. 1.5 mm [0.06 in] deep or M18 x 1.5 ISO 6149,
15 mm [0.59 in] deepy = 29 mm [1.14 in],max. 1.5 mm [0.06 in] deep

T, L, R:
9/16 - 18 UNF O-ring boss
12.7 mm [0.50 in] deepy = 25 mm [0.98 in],max. 1.5 mm [0.06 in] deep

BC152886483962en-001003

Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
Priority Valves OLSA, OLS, and OLSPOLS 40, OLS 80

XY

42 [1.65]

41 [1.61]

PPP

22 [0.87]

40.3 [1.587]
25 [0.98]

40.3 [1.587]Z

139 [5.47]
19.7 [0.776]

LS

EF

CF
Ø8.9 [0.350]
Ø8.5 [0.335]
19.7 [0.776]

20.3 [0.799]

X

39 [1.54]

152B136.11© Danfoss | April 2021

European version:

US version:

P, EF:
G 1/2 w. spot face
15 mm [0.59 in] deepx = 29 mm [1.14 in],max. 1.5 mm [0.06 in] deepor M22 x 1.5 ISO 6149
15 mm [0.59 in] deep,x = 34 mm [1.34 in],max. 1 mm [0.04 in] deepP, EF:
7/8 - 14 UNF O-ring boss
15 mm [0.59 in] deepx = 34 mm [1.14 in],max. 1.3 [0.05] deepCF:
G 1/2 w. spot face
14 mm [0.55 in]deepy = 29 mm [1.14 in],max. 1.5 mm [0.06 in] deep or M18 x 1,5 ISO 6149
12 mm [0.47 in] deep,y = 29 mm [1.14 in],max. 1 mm [0.04 in] deepCF:
3/4-16 UNF O-ring boss
14.3 mm [0.56 in] deepy = 30 mm [1.18 in],max. 1.3 mm [0.05 in] deepLS:
G 1/4 w. spot face
12.5 mm [0.49 in] deepz = 21mm [0.83 in],LS:
7/16-20 UNF O-ring boss
12.5 mm [0.49 in] deepz = 21 mm [0.83 in],

BC152886483962en-001003 | 73

Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
Priority Valves OLSA, OLS, and OLSP
max. 1 mm [0.04 in] deep or M12 x 1,5 ISO 6149
12,5 mm [0.49 in] deep,z = 22 mm [0.86 in]
0 mm deep74 | © Danfoss | April 2021

max. 1 mm [0.04 in] deep

BC152886483962en-001003

Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
Priority Valves OLSA, OLS, and OLSPOLS 120XX

24 [0.94]
56 [2.20]

Ø9.1 [0.358]
Ø8.7 [0.343]

LS

P

Z

66 [2.60]

PP

80 [3.15]

96 [3.78]

53 [2.09]

CFEFØ9.1 [0.358]
Ø8.7 [0.343]

Z
10 [0.39]

18.7 [0.736]

38.4 [1.512]
114 [4.49]
140 [5.51]

Y
152B173.11© Danfoss | April 2021

European version:

US version:

P, EF:
G 3/4 w. spot facex = 42 mm [1.65 in],max. 2.5 mm [0.10 in] deep or M27 x 2 ISO 6149
x = 40 mm [1.57 in],max. 2.5 mm [0.10 in] deepP, EF:
1 1/16 - 12 UN O-ring boss
x = 41mm [1.61 in],max. 1.5 mm [0.06 in] deepCF:
G 1/2 w. spot facey = 34 mm [1.34 in],max. 2.5 mm [0.10 in] deep or M18 x 1.5 ISO 6149
y = 29 mm [1.14 in],max. 2.5 mm [0.10 in] deepCF:
3/4 - 16 UNF O-ring boss
y = 30 mm [1.18 in],max. 1.5 mm [0.06 in] deepLS, PP:
G 1/4 w. spot face
12 mm [0.47 in] deepz = 19 mm [0.75 in]
0 mm deepor M12 x 1,5 ISO 6149
11,5 mm [0.45 in] deep,z = 19 mm [0.75 in]
0 mm deepLS, PP:
7/16 - 20 UNF O-ring boss
11.5 mm [0.45 in] deepz = 19 mm [0.75 in] 0 mm deep

BC152886483962en-001003 | 75

Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
Priority Valves OLSA, OLS, and OLSPOLS 160

YX
178 [7.01]
33 [1.26]
25 [0.98]

U

35 [1.38]

63 [2.48]
130 [5.12]

124 [4.88]
61.3 [2.41]

ø8.9 ± 0.2 [ø0.35 ± 0.01]

ø8.9 ± 0.2 [ø0.35 ± 0.01]

32 [1.26]

32 [1.26]

75 [2.95]

Z
33 [1.30]
66 [2.60]

X76 | © Danfoss | April 2021

European version:

US version:

P, EF:
G 3/4 w. spot facex = 42 mm [1.65 in],max. 2.5 mm [0.10 in] deep or G 1 w. spot facex = 47 mm [1.85 in],max 2.5 mm [0.10 in] deepP, EF:
1 1/16-12 UNF O-ring boss
x = 41 mm [1.61 in],max. 2.5 mm [0.10 in] deep or 1 5/16 - 12 UNF O-ring boss
x = 49 mm [1.93 in],max. 2.5 mm [0.10 in] deepCF:
G 1/2 w. spot facey = 34 mm [1.34 in],max. 2.5 mm [0.10 in] deep or G 3/4 w. spot facey = 38 mm [1.50 in],max. 2.5 mm [0.10 in] deepCF:
3/4-16 UNF O-ring boss
y = 32 mm [1.26 in],max. 2.5 mm [0.10 in] deep
7/8 - 14 UNF O-ring boss
y = 30 mm [1.18 in],max. 2.5 mm [0.10 in] deepLS, PP, T:
G 1/4 w. spot face
12 mm [0.47 in] deepz = 22.8 mm [0.89 in],max. 1 mm [0.04 in]deepu = 25 mm [0.98 in]max. 1.5 mm [0.06 in] deepLS, PP, T:
7/16 - 20 UNF O-ring boss
11.5 mm [0.45 in] deepz = 22,8 mm [0.89 in],max. 1.5 mm [0.06 in] deepu = 21 mm [0.83 in],max. 1.6 mm [0.06 in] deep

BC152886483962en-001003

Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
Priority Valves OLSA, OLS, and OLSPOLSP 80

31.2 [1.228]

38 [1.50]

43.5 [1.713]

Ø24.4 [0.961]
1.88 [0.74] deep

24.7 [0.972]

24.7 [0.972]

33 [1.30]

84 [3.31]

X

32 [1.26]

19.5 [0.768]

Y

38 [1.50]

CF20 [0.89]
52 [2.05]

33 [1.30]

91 [3.58]

Ø6.5 [0.26]

Ø11 [0.04]

25 [0.98]

LSEF
24 [0.94]

152-180.11© Danfoss | April 2021

European version:

US version:

CF:
G 3/8 w. spot face
15 mm [0.59 in] deepx = ø28, max. 1.5 mm [0.06 in] deep or M18 • 1.5 ISO 6149
15 mm [0.59 in] deepy = ø29, max. 1.5 mm [0.06 in]CF:
3/4-16 UNF O-ring boss
15 mm [0.59 in] deepx = ø29 [1.14 in]max. 1.5 mm [0.06 in] deepEF:
G 1/2 w. spot face
15 mm [0.59 in] deepy = ø34, max. 1.5 mm [0.06 in] or M22 • 1.5 ISO 6149 15mm [0.59 in] deepx = ø34, max. 1.5 mm [0.06 in]EF:
7/8 - 14 UNF O-ring boss
16.7 mm [0.66 in] deepy = ø34 [1.34 in]max. 1.5 mm [0.06 in] deepLS:
G 1/4 w. spot face
12.5 mm [0.49 in] deep or M12 • 1.5 ISO 6149 12.5 mm[0.49 in] deepLS:
7/16 - 20 UNF O-ring boss
12.5 mm [0.49 in] deep

BC152886483962en-001003 | 77

Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
Priority Valves OLSA, OLS, and OLSPOLS 320 in-line
236 [9.29]
33 [1.30]

47.5 [1.870]

3xØ20 [0.79]

47.5 [1.870]

5 [0.20]48 [1.89]

4 [0.16]

7 [0.28]

59 [2.32]

2xØ16 [0.63]

3xØ8.5 [0.335]

Y
63.5 [2.500]

14 [0.55]

EF

LS

PP

78 [3.07]

T

22.5 [0.886]

47.5 [1.870]

117.5 [4.626]

PZ

52.5 [2.067]

CFX

47 [1.85]

X

80 [3.15]

150H26.10

European version:

US version:

P, EF:
G 1 w. spot facex = ø47 mm [1.85 in]max 1 mm [0.04 in] deepP, EF:
1 5/16-12 UN O-ring boss
x = ø49 mm [1.93 in]max 0.2 mm [0.01 in] deepCF:
G 1/2 w. spot facey = ø34 mm [1.34 in]max 2.5 mm [0.10 in] deepCF:
1 1/16-12 UN O-ring bossy = ø41 mm [1.61 in]
max 0.2 mm [0.01 in] deep or 3/4-16UNF O-ring bossy = ø30 mm [1.18 in]
max 0.2 mm [0.01 in] deepLS, PP:
G 1/4 w. spot face

LS, PP, T:
7/16-20 UNF O-ring boss

T:
G 1/4 w. spot facez = ø25 mm [0.98 in]
max 1.5 mm [0.06 in] deep78 | © Danfoss | April 2021

BC152886483962en-001003

Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
Flow Amplifiers OSQA and OSQB
Versions
OSQA and OSQB static
Flow amplifier OSQ is used in steering systems of large vehicles and vessels that need high oil flow for
their steering. A steering system of this nature consists of a steering unit and a flow amplifier.

OSQA static

OSQB static

CR

CL

CR

CL

P
L

P
L

R
T
LS

R
T
LS

EF

PP

EF

PP

HP

HT

HP

HT

150F56.10

150F55.10

CR

CL

CL

L

R

P

CR

L

R

P

EF
PP

T

HP

LS

HT
150F69.10© Danfoss | April 2021

EF
PP

T

HP

LS

HT
150F54.10

BC152886483962en-001003 | 79

Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
Flow Amplifiers OSQA and OSQB
Code numbers and weights
OSQA and OSQB static flow amplifiers for load sensing static steering units
These flow amplifiers have to be used in connection with steering units type OSPBX LS or OSPLX LS.
FlowamplifierCode numbers

Setting pressures

Connections:see Dimensions on page 86

Pilot pressure Shock valvesrelief valve
bar [psi]bar [psi]

Controlspringpressurebar [psi]

Weightkg [lb]EuropeanversionUS version

OSQA 4

150F0040

150F0043

170 [2465]

230 [3335]

7 [101]

29 [64]OSQA 5150F0041

150F0044

170 [2465]

230 [3335]

7 [101]

29 [64]OSQA 8150F0042

150F0045

170 [2465]

230 [3335]

7 [101]

29 [64]OSQB 4

150F0030

150F0053

170 [2465]

230 [3335]

7 [101]

29 [64]OSQB 5150F0031

150F0054

170 [2465]

230 [3335]

7 [101]

29 [64]OSQB 8150F0032

150F0055

170 [2465]

230 [3335]

7 [101]

29 [64]OSQB 10-150F0094

170 [2465]

260 [3770]

7 [101]

29 [64]

If you require other amplification factors, other valve settings or other control spring pressures, please fillin the order form under Specification table for non catalogue numbers of Danfoss Priority Valves on page 62
and contact the Danfoss Sales Organization.

80 | © Danfoss | April 2021

BC152886483962en-001003

Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
Flow Amplifiers OSQA and OSQB
Specification table for non catalogue numbers of Danfoss Flow Amplifier
Fill in your company data and place x’s in the table where appropriate, then send to your Danfoss Sales
Organization
Your
company

Name

VehiclePotential pcs/yearYour
application

Pump flow to OSQ at idle, l/min [US gal/min]

Pump flow to OSQ at max engine speed, l/min [US gal/min]

Flow amplifier
type

OSQA

OSQB

Amplification
factor4

Load sensing
type

StaticControl springbar

7 [101]PP-connection

Internal

External

Ports, OSQA

G: European version
HP, EF, HT, CL, CL: G 3/4
P, T, L, R: G 1/2
PP, LS: G 1/4

UNF: US version
HP, EF, HT, CL, CR: 1 1/16 - 12 UN
P, T, L, R: 3/4 - 16 UNF
PP, LS: 7/16 - 20 UNF

Ports, OSQB

G: European version
HP, EF,: 1 1/4 in SAE flange
HT, CL, CR: 1 in SAE flange
P, T, L, R: G 1/2
PP, LS: G 1/4

UNF: US version
HP, EF: 1 ¼ in SAE flange
HT, CL, CR: 1 in SAE flange
P, T, L, R: ¾ - 16 UNF
PP, LS: 7/16 - 20 UNF

Pilot pressure
relief valve
bar [psi]

100 [1450]

Shock valves,bar [psi]

165 [2393]

Unit black
paintedYes

5

8Completed by

Date

10
Dynamic

10 [145]120 [1740]

200 [2900]

16 [232]

140 [2030]

170 [2465]

230 [3335]

210 [3045]

260 [3770]

240 (3480)

270 [3916]

No

An alternative way to specify a variant is to state an existing code number and add the modifications, you
would like to have implemented in the basic flow amplifier.
Code number of basic flow amplifier: __________________________
Requested modifications:________________________________________________________________________________________________________________________________________________________________________________________________________________________________© Danfoss | April 2021

BC152886483962en-001003 | 81

Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
Flow Amplifiers OSQA and OSQBTechnical data
Flow and pressure
Flow amplifier

Rated flow to
HP-connectionl/min[US gal/min]Max. pressure on connections
HP, EF, CL CR
bar [psi]

LS, PP, P, L, R
bar [psi]HTbar [psi]Tbar [psi]

OSQA

240 [63.4]

280 [4061]

240 [3480]

15 [217.5]

15 [217.5]

OSQB

400 [106]280 [4061]

240 [3480]

10 [145]

15 [217.5]

Total displacement of Steering System
FlowamplifierAmpli- Steering unit
ficationOSPBX/OSPCX LS
factorOSPLX LS160
cm³/rev[in³/rev]

200
cm³/rev[in³/rev]

315
cm³/rev[in³/rev]

400
cm³/rev[in³/rev]

520
cm³/rev[in³/rev]
2080 [127]

OSQA 44640 [39]

800 [49]

1260 [77]1600 [98]

OSQA 55800 [49]

1000 [61]1575 [96]2000 [122]OSQA 881280 [78]1600 [98]

OSQA
10

10

1600 [98]

OSQB 44OSQB 55OSQB 88OSQB 10 102000 [122]630
cm³/rev[in³/rev]

800
cm³/rev[in³/rev]

2080 [127]2520 [154]3200 [195]2000 [122]2600 [159]3150 [192]4000 [244]2520 [154]3200 [195]4160 [254]3150 [192]4000 [244]Installation
The flow amplifier has to be mounted on a flat surface.
Mounting screw

Tightening torque, Nm [lbf.in]

M 10 x 1.5

30 ±5 [265 ±44]

3/8 - 16 UNC

40 ±5 [354 ±44]7/16 - 14 UNC

55 ±5 [487 ±44]

Tightening torque for fittings: Look in sub catalogue “General Steering Components” page 36.
Valve functions in the flow amplifiers
The data below come from measurements on a representative sample of flow amplifiers from production.
Oil with viscosity of 21 mm²/s [102 SUS] at 50 °C [122 °C] was used during measuring.
Priority valve
The priority valve is used in load sensing systems where the same pump supplies oil to both the steeringsystem and working hydraulics. The steering system always has first priority. Measurements were madewhen the pressure on the LS connection is zero (steering unit is in neutral position). The minimum curves
apply when the pressure on the EF connection is higher than the actual control spring pressure. The
curves for control spring pressure of 7 bar [101.5 psi] apply when the pressure on the EF connection iszero

82 | © Danfoss | April 2021

BC152886483962en-001003

Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
Flow Amplifiers OSQA and OSQB
OSQA
HP-EF
psi
150

HP-EF
bar
10

7 bar
102 psi

125
8
100
6

min.

75
4

50
25

2

0

0
0

20

40

0

60

10

80

100

20

120

140

160

30

180

40

200

Qp
240 l/min

220

50

60

Qp
US gal/min
150F64.10

OSQB
HP-EF
psi

HP-EF

200

bar
14

175

12

150
125

7 bar
102 psi

10
8

100
75

6

50

4

25

2

0

0

min.

Qp
0

40

80

120

0

10

20

30

160
40

200
50

240
60

280
70

320
80

360
90

400 l/min
100

Qp
US gal/min
150F63.11

OSQ pilot pressure relief valve (HP - HT, Qp) characteristic
The pilot pressure relief valve protects the steering valve against excessive pressure. The pilot pressure
relief valve together with the priority valve limit the maximum steering pressure HP-HT.
The pilot pressure relief valve in OSQ is set with an oil flow of 140 l/min [37 US gal/min] supplied to the
HP connection.
For OSQA the setting values are valid for pump flow 140 l/min [37 US gal/min].
For OSQB the setting values are valid for pump flow 240 l/min [63 US gal/min]: the setting is done at 140
l/min [37 US gal/min], but compensated to match 240 l/min [63 US gal/min].
Setting tolerance: rated value +10 bar [+145 psi]. The curves below are valid for rated settings 170 bar[2466 psi].

© Danfoss | April 2021

BC152886483962en-001003 | 83

Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
Flow Amplifiers OSQA and OSQB
OSQA
HP-HT HP-HT
psi

bar
190

2700

2600

2500

185
180
175

OSQA

170
2400
165
2300

2200

160
155

Qp

150
0

20

0

40

60

10

80

100

20

120

140

30

160

180

40

200

220

50

240

l/min

Qp
US gal/min

60

150F67.12

OSQB
OSQB

HP-HT HP-HT
psi

bar

2900

200

2800
190
2700
2600

180

2500

OSQB

170
2400
2300

160

2200
150
2100

Qp

140
0

40

0

10

80

120

160

200

240

280

320

360

400

l/min

Qp
20

30

40

50

60

70

80

90

100

US gal/min
150F66.12

Back pressure valve
The back pressure valve in (OSQB only) increases the capacity of the suction valves. The pressure drop
shown applies to the back pressure valve only.

84 | © Danfoss | April 2021

BC152886483962en-001003

Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
Flow Amplifiers OSQA and OSQB
′p

′p

psi
225

bar
15

200
175
150

10

125
100
75

5

50
25

Qp

0

0

0

40

0

10

80

20

120

160

30

40

200

240

50

60

280

320

70

80

360

90

400 l/minQp
US gal/min

100

150F68.10

Shock valves
The shock valves protect the flow amplifier against shock from external forces on the steering cylinders.
The shock valves in OSQA and OSQB limit the maximum pressure drop from CL to HT and from CR to HT.
The shock valves are set at 10 l/min [2.64 US gal/min].
Setting tolerance: rated value +20 bar [290 psi].
Suction valves
The suction valves ensure oil suction on the side of the steering cylinder pistons where in unfavorable
conditions cavitation might occur. The capacity of the suction valves is increased in OSQB by the built-inback pressure valve.
HT-CR
HT-CL
psi
150

HT-CR
HT-CL
bar
10
8

100
6

50

4
2

0

Qp

0
0
0

10

20
5

30

40
10

50

60
15

70

80
20

90

100
25

110
30

120

130
35

140

150
40

160 l/minQp
US gal/min
150F35.11© Danfoss | April 2021

BC152886483962en-001003 | 85

Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
Flow Amplifiers OSQA and OSQB
Dimensions
OSQA
165 [6.50]
153 [6.02]
112 [4.41]

285 [11.22]

47 [1.85]
78 [3.07]

B

150.2 [5.91]
149.8 [5.90]

A

75.2 [2.96]
74.8 [2.94]

5 [0.20]

5.3 [0.21]
4.7 [0.19]

Ø16.018 [0.631]
Ø16.000 [0.630]

82 [3.23]
min. 21 [0.83]

16 [0.63]

120.2 [4.73]
119.8 [4.72]

150 [5.91]

17 [0.67]

Ø16.018 [0.631]
Ø16.000 [0.630]

A

129 [5.08]
121 [4.76]
56 [2.20]

125 [4.92]
125 [4.92]

86 [3.39]

31 [1.22] 31 [1.22]

86 [3.39]

55 [2.17]

68 [2.68]

41 [1.61]

150F36.11

86 | © Danfoss | April 2021

BC152886483962en-001003

Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
Flow Amplifiers OSQA and OSQB

© Danfoss | April 2021

European version:

US version:

HP, EF, HT, CL, CR: G ¾
P, T, L, R: G 1/2
PP, LS: G 1/4

HP, EF, HT, CL, CR: 1 1/16 - 12 UN
P, T, L, R: ¾ - 16 UNF
PP, LS: 7/16 - 20 UNF

A: M10 x 1.5, 21 mm [0.83in] deep
B: M10 x 1.5, 16 mm [0.63 in] deep

A: 7/16 - 14 UNC, 21 mm [0.83 in]deep
B: 7/16 - 14 UNC, 16 mm [0.63 in] deep

BC152886483962en-001003 | 87

Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
Flow Amplifiers OSQA and OSQB
OSQB
165 [6.50]
153 [6.02]
112 [4.41]

120.2 [4.73]
119.8 [4.72]

285 [11.22]

47 [1.85]
58.7 [2.31]

150 [5.91]

17 [0.67]

16 [0.63]

AØ16.018 [0.631]
Ø16.000 [0.630]

78 [3.07]

30.2 [1.19]
30.2 [1.19]

B

150.2 [5.91]
149.8 [5.90]

A

75.2 [2.96]
74.8 [2.94]

5 [0.20]

5.3 [0.21]
4.7 [0.19]

Ø16.018 [0.631]
Ø16.000 [0.630]

82 [3.23]
min. 21 [0.83]

129 [5.08]
121 [4.76]
56 [2.20]

125 [4.92]
125 [4.92]

86 [3.39]

31 [1.22] 31 [1.22]

86 [3.39]

26.2 [1.03]
26.2 [1.03]

52.4 [2.06]

55 [2.17]

68 [2.68]

41 [1.61]

26.2 [1.03]
52.4 [2.06]
150F37.10

European version:

88 | © Danfoss | April 2021

US version:

BC152886483962en-001003

Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
Flow Amplifiers OSQA and OSQB

© Danfoss | April 2021

HP, EF:
1 1/4 in SAE flange
7/16-14 UNC
18 mm [0.71 in] deep (8)HP, EF:
1 1/4 in SAE flange
7/16 - 14 UNC
18 mm [0.71 in] deep (8)HT, CL, CR:
1 in SAE flange
3/8 - 16 UNC
18 mm [0.71 in] deep (12)HT, CL, CR:
1 in SAE flange
3/8 - 16 UNC
18 mm [0.71 in] deep (12)P, T, L, R: G 1/2
PP, LS: G 1/4

P, T, L, R: 3/4 - 16 UNF
PP, LS: 7/16 - 20 UNF

A: M10 x 1,5, 21 mm [0.83 in] deep
B: M10 x 1,5, 16 mm [0.63 in] deep

A: 7/16 - 14 UNC, 21 mm [0.83 in] deep
B: 7/16 - 14 UNC, 16 mm [0.63 in] deep

BC152886483962en-001003 | 89

Products we offer:

•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•

Cartridge valves
DCV directional control
valvesElectric converters
Electric machines

Danfoss Power Solutions is a global manufacturer and supplier of high-quality hydraulic andelectric components. We specialize in providing state-of-the-art technology and solutions
that excel in the harsh operating conditions of the mobile off-highway market as well as themarine sector. Building on our extensive applications expertise, we work closely with you toensure exceptional performance for a broad range of applications. We help you and othercustomers around the world speed up system development, reduce costs and bring vehicles
and vessels to market faster.

Gear motors

Danfoss Power Solutions – your strongest partner in mobile hydraulics and mobile
electrification.

Gear pumps

Go to www.danfoss.com for further product information.

Hydraulic integrated
circuits (HICs)
Hydrostatic motors

We offer you expert worldwide support for ensuring the best possible solutions foroutstanding performance. And with an extensive network of Global Service Partners, we also
provide you with comprehensive global service for all of our components.

Electric motors

Hydrostatic pumps
Orbital motors
PLUS+1® controllers
PLUS+1® displays
PLUS+1® joysticks andpedals
PLUS+1® operator
interfaces
PLUS+1® sensors
PLUS+1® software
PLUS+1® software services,support and training
Position controls andsensors
PVG proportional valves
Steering components andsystems
Telematics

Local address:

Hydro-Gear
www.hydro-gear.com
Daikin-Sauer-Danfoss
www.daikin-sauer-danfoss.com

Danfoss
Power Solutions (US) Company
2800 East 13th Street
Ames, IA 50010, USA
Phone: +1 515 239 6000

Danfoss
Power Solutions GmbH & Co. OHG
Krokamp 35
D-24539 Neumünster, Germany
Phone: +49 4321 871 0

Danfoss
Power Solutions ApS
Nordborgvej 81
DK-6430 Nordborg, Denmark
Phone: +45 7488 2222

Danfoss
Power Solutions Trading(Shanghai) Co., Ltd.
Building #22, No. 1000 Jin Hai Rd
Jin Qiao, Pudong New District
Shanghai, China 201206
Phone: +86 21 2080 6201

Danfoss can accept no responsibility for possible errors in catalogues, brochures and other printed material. Danfoss reserves the right to alter its products without notice. This also applies to products
already on order provided that such alterations can be made without subsequent changes being necessary in specifications already agreed.
All trademarks in this material are property of the respective companies. Danfoss and the Danfoss logotype are trademarks of Danfoss A/S. All rights reserved.

© Danfoss | April 2021

BC152886483962en-001003