Technical Information

Steering
VSPP Steering Unit

www.danfoss.com

Technical Information
VSPP Steering Unit

Revision history

2 | © Danfoss | July 2021

Table of revisions
Date

ChangedRev

July 2021

Minor corrections to MMC section

0102

October 2020

First edition

0101

BC358854914884en-000102

Technical Information
VSPP Steering Unit
Contents
Overview
A wide range of steering components..................................................................................................................................... 4
Conversion factors........................................................................................................................................................................... 5
Survey of literature with technical data on Danfoss steering components................................................................5
Steering unit type VSPP
General................................................................................................................................................................................................. 6
VSPP.......................................................................................................................................................................................................6
Load Sensing dynamic steering unit with built in priority valve, VSPP LS............................................................. 6
Non-reaction.................................................................................................................................................................................6
Gear set........................................................................................................................................................................................... 7
VSPP versions, overview.................................................................................................................................................................7
VSPP circuits....................................................................................................................................................................................... 8
Technical data, VSPP LS
Displacement, flow and pressure............................................................................................................................................... 9
Valve functions................................................................................................................................................................................10
Pilot pressure relief valve; (P-T, Qp) characteristic............................................................................................................. 11
Check valve function in LS..........................................................................................................................................................11
Pressure drop, P-EF........................................................................................................................................................................12
Shock valves.....................................................................................................................................................................................12
Suction valves..................................................................................................................................................................................13
Check valve in P.............................................................................................................................................................................. 13
Weights..............................................................................................................................................................................................14
Port thread versions
Dimensions
VSPP.................................................................................................................................................................................................... 16
VSPP dimensions details..............................................................................................................................................................17
VSPP: Variants and ordering specifications
VSPP MMC.........................................................................................................................................................................................18
Variants codes for VSPP MMC....................................................................................................................................................19© Danfoss | July 2021

BC358854914884en-000102 | 3

Technical Information
VSPP Steering Unit
Overview
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

Rated Flow

Steering Pressure

Mini steering units

32 – 100 cm3/rev[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

4 | © Danfoss | July 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]

BC358854914884en-000102

Technical Information
VSPP Steering Unit
Overview
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 with technical data on Danfoss steering components
Detailed data on all Danfoss steering components and accessories can be found in our steering
component catalogues, which is divided into the following individual sub-catalogues:
General information

Steering components

Technical data on mini steering units

OSPM

Technical data on open center and closed center steering OSPB, OSPC, and OSPD
units
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 steering units

VSP

Technical data on steering units

VSPP

Technical data on hydraulic and electrohydraulic pilot
operated steering valves, electrical actuation modules
and appropriate steering units

EHPS, EHPS w. OLS 320, PVE for EHPS and OSPCXTechnical data on combined sterering unit/
electrohydraulic steering valves

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.

© Danfoss | July 2021

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Technical Information
VSPP Steering Unit
Steering unit type VSPP

GeneralThe VSPP is a steering unit with integrated priority valve inside the envelope of a standard steering unit
housing.
This brings about a very compact solution minimizing installation space, cost and time.
VSPP is the perfect solution for smaller vehicles like e.g. low horse power tractors, mini wheel loaders andlight fork lift trucks, where one gear pump is in use for steering and working hydraulic.
All VSPP products are black painted as standard.
VSPP
All VSPP's are High Spec. for maximum steering pressure 190 bar [2755 psi].
Load Sensing dynamic steering unit with built in priority valve, VSPP LS
The VSPP is a steering unit with integrated priority valve inside the envelope of the standard VSP
housing. VSPP LS are all of load sensing dynamictype and so the integrated priority valve is dynamic type.
Spool/sleeve sets for 2 levels of LS dynamic flow are available:• Standard LS spool/sleeve set: 0.6 - 0.9 l/min [0.16 - 0.24 US gal/min]• High dynamic LS spool/sleeve set: 1.0 - 1.3 l/min [0.26 - 0.34 US gal/min]
High dynamic is recommended, when extreme fast response is requested, e.g. when unloading working
hydraulic load (EF) very rapidly during steering. Trade off with high dynamic is slightly higher energy
consumption.
Non-reaction
VSPP’s are non-reaction steering units, where there is no movement of the steering wheel, when thedriver is not steering the vehicle. The vehicle keeps the steering direction independent of forces on thesteering cylinder.

6 | © Danfoss | July 2021

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Technical Information
VSPP Steering Unit
Steering unit type VSPP
Gear set
The gear set meters the volume of oil/revolution on the steering wheel, cm3/rev. 2 versions of gear set areavailable for VSPP:• Low Noise is default for VSPP up to and including 250 cm3/rev. VSPP 315 and VSPP 400 will have gearset with standard profile• Seal star: reduces slippage, when steering cylinder is at end stroke. Seal star gear sets are available in50, 70, 80, 100 and 125 cm3/rev.
All seal star gear sets have standard profile.
VSPP versions, overview
The VSP's are available in the x-marked combinations:
Type

Spool/sleeve set
Standard

VSPP LS: Load
Sensing non reaction
w. int. Priority valve

Gear set
LS: High dynamic

X
X

Seal star
X

X
X© Danfoss | July 2021

Low Noise
X
X

X

BC358854914884en-000102 | 7

Technical Information
VSPP Steering Unit
Steering unit type VSPP
VSPP circuits
VSPP Load Sensing dynamic, steering unit with integrated valve functions
VSPP LS Load Sensing Non-reaction

8 | © Danfoss | July 2021

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Technical Information
VSPP Steering Unit
Technical data, VSPP LS
Displacement, flow and pressure
For common data: Look in sub catalog: "General Steering Components"

Steering unit

Displacement
cm3 /rev [in3/rev]

Rated oil flow
for steering @100 rpml/min [US gal/min]

VSPP 50 LSH

50 [3.05]

5 [1.32]

VSPP 70 LSH

70 [4.27]

7 [1.85]

VSPP 80 LSH

80 [4.88]

8 [2.11]

VSPP 100 LSH

100 [6.10]

10 [2.64]

VSPP 125 LSH

125 [7.63]

13 [3.43]

VSPP 160 LSH

160 [9.76]

16 [4.23]

VSPP 200 LSH

200 [12.20]

20 [4.23]

VSPP 250 LSH

250 [15.26]

25 [6.60]

VSPP 315 LSH

315 [19.22]

32 [8.45]

VSPP 400 LSH

400 [24.41]

40 [10.57]

Max. oil flowfrom pumpl/min [US gal/min]Max. pressure, bar [psi]Systempressure1/
P-T
portpressureT, absolute
port pressure

L-T/R-T portpressure

P and EF,absolute
port pressure

30 [435]

250 [3625]

230[3335]

140 [2030]
170 [2465]

80[21.1]
190 [2755]

1 Any VSPP LSH can withstand 190 bar [2755 psi] in max steering system pressure. However, VSPP w small gear set and high pressure will haverelatively high slippage values.

© Danfoss | July 2021

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Technical Information
VSPP Steering Unit
Technical data, VSPP LS
Valve functions

All VSPP LS have the following valves built in:Priority valve (7)P-Check valve in CF line (5)Pilot relief valve (4)Check valve in LS (6)Emergency steering check valve (3)

•
•
•
•
•

All VSPP LS with UNF and Metric ports also have the following valves built in:• Shock valves (1)• Suction valves (2)VSPP LS with G-thread ports can be specified with or without shock and suction valves
Shock and suction are always combined

10 | © Danfoss | July 2021

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Technical Information
VSPP Steering Unit
Technical data, VSPP LS
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 VSPP LS steering unit together with the integrated priority valve spool, limits the
maximum steering pressure P-T. The pilot pressure relief valve is set at an oil flow to the P-port of the
VSPP valve of 25 l/min [6.60 US gal/min].
For VSPP load sensing dynamic steering units with standard LS spool/sleeve set, the setting values arevalid at a dynamic flow of 0.6 l/min [0.16 US gal/min].
For VSPP load sensing high dynamic steering units with low noise/high dynamic spool/sleeve set, thesetting 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

bar

2900

200

2650

180

2400

A

B

160

2150
140
1900
120
1650
1400

100

1150

80

900

60
0

10
2

20
4

30
6

A

170 + 5/-0 bar [2465+ 73/-0 psi]B

140 + 5/-0 bar [2030 + 73/-0 psi]

8

50

40
10

12

14

16

80 l/min

70

60
18

20

US gal/min

Check valve function in LS
The check valve in the LS line of VSPP LS dynamic steering units protects the driver against steering
wheel jerks. The check valve prevents oil from flowing backwards into the LS line to the priority valve,when steering against a high pressure on the cylinder side. The need for the LS check valve is very systemdependent. It is recommended to be included in VSPP LS up to and including 200 cm3/rev sizes.

© Danfoss | July 2021

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Technical Information
VSPP Steering Unit
Technical data, VSPP LS
Pressure drop, P-EF
This data comes from measurements on a representative sample of VSPP LS w. standard spool/sleeve set.
Oil with viscosity of 21 mm²/s at 50 °C [102 SUS at 122 °F] was used during measuring. Measurement
made when 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 for control spring pressure of 4 or 7 bar [58 or 101 psi] apply when pressure on the EF connectionis zero.
Pressure drop, P-EF, for VSPP LS w. standard dynamic LS spool/sleeve set

P-EF, VSPP
psi

bar
18

240

16

210

14

180

12

4 bar

150

10

min.

120

8

90

6

60

4

30

2

0

0

7 bar

Qp
0

10

0

3

6

9

60

50

40

30

20

12

15

70
18

80 l/min
21 US gal/min

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].

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Technical Information
VSPP Steering Unit
Technical data, VSPP LS
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 selfstraightening tendencies and on articulated steered vehicles, we recommend 5-10 bar [72.5 - 145 psi]. For
further advice, please contact the Danfoss Sales Organisation.
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
40

4
3
2

20
0

1

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
2.75

l/min

Qp
US gal/min
150-374.10

Check valve in P
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 adaptors with 11 mm [0.43 in] minimum bore.
′p
psi
90

′p
bar

75

5

60

4

45

3

30

2

15

1

0

0

6

0
0

© Danfoss | July 2021

20

10
3

6

50

40

30
9

12

Qp
l/min
Qp
USgal/min

BC358854914884en-000102 | 13

Technical Information
VSPP Steering Unit
Technical data, VSPP LS
Weights

14 | © Danfoss | July 2021

Type

Weight, kg [lb]

VSPP 50 LS

5.2 [11.46]

VSPP 70 LS

5.3 [11.68]

VSPP 80 LS

5.3 [11.68]

VSPP 100 LS

5.4 [11.90]

VSPP 125 LS

5.5 [12.13]

VSPP 160 LS

5.6 [12.35]

VSPP 200 LS

5.8 [12.79]

VSPP 250 LS

6.0 [13.23]

VSPP 315 LS

6.2 [13.67]

VSPP 400 LS

7.0 [15.43]

BC358854914884en-000102

Technical Information
VSPP Steering Unit
Port thread versions
DN

min.15[0.59]

P, T, L, R: max 0.6[0.024]

Ø28.6[1.126]
Ø28.3[1.114]

D

G port w. spot face (P, T, L, R, EF)N

DIN 3852-2 – G1/2

FP

min.15[0.59]

P, T, L, R: max 0.6[0.024]

Ø28.6[1.126]
Ø28.3[1.114]

F

Metric ports w. spot face and O-ring chamfer (P, T, L, R, EF)P

ISO 6149-1 - M18 x 1.5

I© Danfoss | July 2021

Ø20.8 [0.819]
Ø20.6 [0.812]

S
min 15 [0.59]

P, T, L, R: max 0.6 [0.024]

Ø28.6 [1.126]
Ø28.3 [1.114]

I

UNF ports w. spot face and O-ring chamfer (P, T, L, R, EF)S

ISO 11926-1 ¾-16UNF O-ring boss port

BC358854914884en-000102 | 15

Technical Information
VSPP Steering Unit
Dimensions
VSPP
VSPP LS

33.5

30.2

EF

L1

R

T

P

B

44

ø44.4±0.05
ø25.4

L

79

L2

0.3
38

2±

ø8

ø91

A

44

max. 87

min. 7.1

729

EF
min. ø28.6

45°

45.5

57

max. 5.3

2.8

102

A (P, T, L, R, and EF)

G ½ w. spot face (G, DIN 3852-2) 15 mm [0.59 in] deep
Or: M18 x 1.5 ISO 6149-1, 15 mm [0.59 in] deep
Or: 3/4 - 16 UNF O-ring boss ISO 11926-1 15 mm [0.59 in] deepB

16 | © Danfoss | July 2021

M10 x 1.5, 16 mm [0.63 in] deep

BC358854914884en-000102

Technical Information
VSPP Steering Unit
Dimensions
VSPP dimensions details
VSPP dimensions© Danfoss | July 2021

Type

L1
mm [in]L2mm [in]VSPP 50

125 [4.92]

6.5 [0.26]

VSPP 70

127 [4.99]

9.1 [0.36]

VSPP 80

128 [5.04]

10.4 [0.41]

VSPP 100

131 [5.16]

13.0 [0.51]

VSPP 125

134 [5.28]

16.2 [0.64]

VSPP 160

139 [5.47]

20.8 [0.82]

VSPP 200

144 [5.67]

26.0 [1.02]

VSPP 250

150 [5.91]

32.5 [1.28]

VSPP 315

159 [6.26]

40.9 [1.61]

VSPP 400

170 [6.69]

52.0 [2.05]

BC358854914884en-000102 | 17

Technical Information
VSPP Steering Unit
VSPP: Variants and ordering specifications
VSPP MMC
Determine Master Model Code (MMC). Fill in with codes from Variants codes for VSPP MMC on page 19,
to specify VSPP steering unit.
MMC-pos.

1

2

3

4

5

6

7

Type

Displ.

Circuit type

PTL&R size

PTL&R
interface

ColumnthreadEF size

Example*

VSPP##

0100

LSH#

UUUU

C

M

H

MMC-pos.

8

9

10

11

12

13

14

EF interface

EF location

Relief valve

Shock valves Suction
valvesCheck valves Neutral
springs

C

9

180

240

4

Your VSPP

Your VSPP
Example*MMC-pos.

1

N03

15

16

17

18

19

Spool/sleeve set

Gear setSpecial

Label

Paint

SV5

G01

NN

DNFS

PB

Your VSPP
Example** Example is a valid for Catalog code of VSPP 100 LSH: 11189283

18 | © Danfoss | July 2021

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Technical Information
VSPP Steering Unit
VSPP: Variants and ordering specifications
Variants codes for VSPP MMC© Danfoss | July 2021

MMC pos. 1

Main steering product Type1VSPP##VSPP Steering units w. integrated priority valve

MMC pos. 2

Displacement, cm3/rev

0050

50

0070

70

0080

80

0100

100

0125

125

0160

160

0200

200

0250

250

0315

315

0400

400

MMC pos. 3

Circuit type

LSH#

Load Sensing non reaction, High spec.

MMC pos. 4

P, T, L & T Port Size

MMMM

M18x1.5 (ISO 6149-1)

UUUU

3/4"-16 UNF (ISO 11926-1)

GGGG

G1/2" (DIN 3852-2)

MMC pos. 5

P, T, L & T Port InterfaceA

O-ring boss + Spot-face (ISO 6149-1)

CO-ring boss + Spot-face (ISO 11926-1)

E

Spot-face (for G-thread, DIN 3852-2)

MMC pos. 6

Column ThreadM

M10x1,5

MMC pos. 7

EF Port Size

M

M18x1.5 (ISO 6149-1)

H

3/4"-16 UNF (ISO 11926-1)

G

G1/2" (DIN 3852-2)

MMC pos. 8

EF Port InterfaceA

O-ring boss + Spot-face (ISO 6149-1)

CO-ring boss + Spot-face (ISO 11926-1)

E

Spot-face (for G-thread, DIN 3852-2)

MMC pos. 9

EF Port Location

9

On SideBC358854914884en-000102 | 19

Technical Information
VSPP Steering Unit
VSPP: Variants and ordering specifications

20 | © Danfoss | July 2021

MMC pos.
10

Relief valve setting

140

Value for setting (140 bar), P-T.
All VSPP's have relief valve.
Range VSPP: 50 - 190 bar

MMC pos.
11

Shock valves

NNN

No shock valves (only possible for VSPP with G-thread, DIN 3852-2)

200

Value for setting (200 bar), R-T/L-T.
Shock and suction valves are belonging
Range: 110 - 250 bar, last digit: 0 or 5

MMC pos.
12

Suction valvesN

No suction valves (only possible for VSPP with G-thread, DIN 3852-2)

1

Shock and suction valves are belonging

MMC pos.
13

Check valves

1

Check valve in P (standard)

4

Check valve in P and in LS (standard in LS up to and included 200 ccm/rev)

MMC pos.
14

Neutral Springs

N01

11124634, torque 0.7-1.7 Nm in normal steering situations. Soft

N03

150N4019, torque 0.6-2.5 Nm in normal steering situations. Medium

N05

150-4209, torque 0.8-4 Nm in normal steering situations. Standard

MMC pos.
15

Spool/ Sleeve Set

SV5

LSH: Dynamic flow recommended 0.6-0.9 l/min. Constant pressure. High Spec.

SV6

LSH High dynamic: Dynamic flow recommended 1.0-1.3 l/min. Constant pressure.
High Spec.

MMC pos.
16

Gear set

G03

Gear set, Standard cross grinded

G01

Gear set, Low Noise/profile grinded, available up to and including 250 ccm/rev

G04

Gear set, Standard cross grinded, with Seal Star (for low slippage)
Available in 50, 70, 80, 100 and 125 ccm/rev

MMC pos.
17

SpecialNN

Not ApplicableXX

Special feature

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Technical Information
VSPP Steering Unit
VSPP: Variants and ordering specifications© Danfoss | July 2021

MMC pos.
18

Label

DNFS

Danfoss name tag

XXXXSpecial Label

MMC pos.
19

Paint

PB

Black, Powder, RAL 9005, Corrosion class C3. Standard covering

BC358854914884en-000102 | 21

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•
•
•
•
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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

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already on order provided that such alterations can be made without subsequent changes being necessary in specifications already agreed.
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