CURRENT-CONTROLLED TYPE RELIEF VALVE（EHR3）This current-controlled type relief valve has been developed for continuous and steplessremote control of hydraulic circuit pressure. To control the pressure, the current input to theDC solenoid in the pilot section is controlled by the control amplifier, thus directly controlling
the poppet action with the attraction force of the solenoid.
When controlling the maximum operating pressure in multiple levels, a single
current-controlled relief valve can meet the requirement, so the hydraulic system is simplified.

■Features
1. Quick response
2. Continuous and stepless remote control of pressure
3. The valve body and control amplifier can be separated to allow installation under harshconditions.
4. Program control is possible.
5. Compared to a servo valve, the valve is less susceptible to foreign matter.
Therefore, the valve operates with less chance of failure and ensures easy maintenance.

■Applications● The recommended drive unit for this valve is TOYOOKI’s control
amplifier.
● The valve can be used for fluids equivalent to ISO VG32 to 56.
● The allowable maximum fluid temperature is 60ºC.
● Bleed the air completely through the air bleed hole on thesolenoid cover. It may cause pressure fluctuation or abnormal
noise.
● If a subplate is necessary, please order one separately.

1. Tension control for paper, steel belts, steel wire, etc.
2. Pressure control for presses and rolling mills
3. Pressure application control for vibration testing machines and fatigue testing machines
4. Extrusion force control for extruders and injection molding machines
5. Positioning control by balancing with mechanical force
6. Remote pressure control for hydraulic equipment■Description of the model designation

EHR3ｰBG5（R）ｰ04

G

Nominal size
With/without safety valve R: With safety valve (no safety valve available for size 025)
Piping method G: Gasket type
Construction B: Balance piston typeMax. operating pressure 3: 21 MPa
Current-controlled type relief valve■Specifications
Nominalsize025

Flow (L/min)Min.

RatingMax.

(NOTE 1)

82004

0.1
8408006

10120

190

Max. operatingpressure(MPa)21

Pressureadjustment range(MPa) (NOTE 2)

Hysteresis(%)

0.7 to 21

40.8 to 21

Safety valve

Step response(sec) (NOTE 3)

Frequency
response(Hz) (NOTE 4)

ModelWithout0.3

9.0

EHR3ｰBG5ｰ025

With0.2

8.5

EHR3ｰBG5Rｰ04

7.0

EHR3ｰBG5Rｰ06

NOTE 1: Use a filter to ensure stable pressure control.
NOTE 2: At a rated flow of 38 ㎜2/s {sCt}.
NOTE 3: Duration required for pressure rise from 0 to 21 MPa (at rated flow; Load capacity* 2,500 ㎝3)
NOTE 4: 10±5 MPa, -3 dB evaluation (at rated flow; Load capacity* 2,500 ㎝3)●Solenoid characteristics
Nominal size of valve

Model025SDM2ｰ02AｰC

0406

SDM2ｰ02AMｰC●Subplate model
Coil Input current (mA)

Coil resistance (Ω)

130 to 1,000

Nominal size of valve

025

1304
06

ModelRemark

SHD025ｰ02T*

P and R ports are used

SHD025ｰ03T*

P and R ports are used

SHR04ｰ04T*

P and R ports are used

SHR04ｰ06T*

P and R ports are used

SHR06ｰ06T*

P and R ports are used

SHR06ｰ08T*

P and R ports are used

G−3

CURRENT CONTROLLED TYPE CONTROL VALVES

Pressure adjustment range 5: 0.5 to 21 MPa

■Outside dimensions
EHR3ｰBG5ｰ025EHRｰBG5Rｰ04

2-JIS B 2401-1AP18
O-ring(O-ring)

2754

80

13

Wiring hole G1/2

VE

JIS B 2401-1AP10O-ring

26

PT

22
47.5
54
126
173.5 Max.

Wire outlet
Air bleed (3 places)
Air bleed
Hex. socket
head screw

Lock nut

184
172.5

Manual screw(Return whenthe current
control is used.)

116.5
91.5
73.5

91.5

Safety valve
adjustment screw
Lock nut
18

6

Pressure gauge
outlet2-∅64-M12

G

Pressure gauge outlet
Rc1/4

Mass: 5.7㎏

EHR3ｰBG5Rｰ06

Manual screw(Return when the current control is used.)
187.5 Max.
Wiring port
G 1/2

Air bleed

JIS B2401-1AP10(O-ring)

244
255.5

Lock nut

Safety valve adjustment screw

24188

VEP

6RPressure gauge connection port
Rc 1/420.5

931133.555.5
6783

Lock nut

2-∅6

CURRENT CONTROLLED TYPE CONTROL VALVES

Mass: 3.4㎏

154-M16
2-JIS B
(O-ring)

3570
100
2401-1AG30

Mass: 8.7㎏

G−4