Cat. C-Edit0E

C

PRESSURE CONTROLS
Valve TypeGraphicSymbols

Max.
OperatingPressure 1MPa

Max. Flow L/min2351020 30

Remote Control
Relief Valves

25

Direct Type
Relief Valves

DT
DG01

21DT/DG

Pilot Operated
Relief Valves

25

Low Noise Type Pilot
Operated Relief Valves

25

S−BG

Relief Valves(High Pressure Type)

35

B3G

Solenoid Controlled
Relief Valves

25

BST/BSGSolenoid Controlled Relief
Valves (High Pressure Type)

35

B3SG

H/HC Type Pressure
Control Valves
Pres. Reducing Valves
Pres. Reducing andCheck Valves

50100200 300 500 1000 2000

Page

C-3C-502
BT/BG

030610C-703

06

10

C-1103
03

06

06
10

C-14
C-17

03

06

C-22

21

HT/HG
HCT/HCG

03

06

10

HF16
HCF16

C-25

21

RT/RG
RCT/RCG

03

06

10

RF 16
RCF

C-36

03：14
06：25

RBG

03

06

25

UBGR

03

06

10

C-47

Unloading Relief Valves

21

BUCG

06

10

C-47

Semiconductor Type
Pressure Switches

35

JT-02

Pressure Monitoring
System20
35

Pressure Reducing andRelieving Valves
Brake Valves

T

C-43

C-48
C-50

C-1

Hydraulic Fluids■ Fluid Types

Any type of hydraulic fluids listed in the table below can be used.
Use any type of fluids, no change in specifications.
Petroleum base oils

Use fluids equivalent to ISO VG 32 or VG 46.

Synthetic fluids

Use phosphate ester or polyol ester fluid. When phosphate ester fluid is used,prefix "F-" to the model number because the special seals (fluororubber) are required to beused.

Water containing fluids

Use water-glycol fluid.

Note: F or use with hydraulic fluids other than those listed above, please consult your Yuken representatives in advance.
Standard model of Semiconductor Type Pressure Switches can use with phosphate ester and W/O emulsion type fluids.

■ Recommended Fluid Viscosity and Temperature

Use under conditions where the viscosity and temperature of the hydraulic fluid remain in the ranges indicated in the following table.
NameRemote Control Relief Valves
Direct Type Relief Valves
Pilot Operated Relief Valves
Low Noise Type Pilot Operated Relief Valves
Relief Valves
Solenoid Controlled Relief Valves★

H Type Pressure Control Valves
HC Type Pressure Control Valves
Pressure Reducing Valves
Pressure Reducing and Check Valves
Pressure Reducing and Relieving Valves

Semiconductor Type Pressure Switches

ViscosityTemperature

15 - 400 mm2/s−15 - ＋70℃

15 - 400 mm2/s−20 - ＋70℃

★ If the valve is provided with a vent ristrictor (ex. : A-BSG/B3SG), the viscosity range should be 15 - 200 mm²/s.

■ Control of Contamination

Due caution must be paid to maintaining control over contamination of the hydraulic fluids which may otherwise lead to breakdowns and shorten
the life of the valves. Please maintain the degree of contamination within NAS 1638-Grade 12. Use 25 µm or finer line filter.

Instructions■ Drain Piping

It is necessary to connect the drain port directly to the reservoir with a back pressure close to the atmospheric pressure.
If neglect this process, there is the risks that system pressure will increase unlimitedly and occur serious accident.

Interchangeability in Installation between Current and New Design
Model change has been made on the following products.
NameSolenoid Controlled
Relief Valve

C-2

Model Numbers
Current

New

BS＊−03,−47

BS＊−03,−48

BS＊−06,−47

BS＊−06,−48

BS＊−10,−47

BS＊−10,−48

Mounting
Interchangeability

Major Changes

PageYes●P ilot valves (DSG-01) have been changedin the design numbers 70.
●T here are no changes in specifications
and mounting dimensions.

—Pressure Controls