A single 4WRH proportional valve can control both flow and flow direction, making the system structure simple.The valve body adopts cast inner channel, with strong flow capacity and large flow rate. The main valve adopts axial triangular control groove, with small pressure drop and pressure loss on the control shoulder. Type 4WRH proportional valve is suitable for systems with large flow and high precision requirements.
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Hydraulic data |
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size |
10 |
16 |
25 |
32 |
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pilot valve pressure (MPa) |
external pilot oil supply |
3 to 10 |
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internal pilot oil supply |
Up to 10 (over 10 must install ZDR6DP2-30B/75YM) |
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Main valve pressure (MPa) |
31.5 |
35 |
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Return pressure (MPa) |
port T (external pilot oil return) |
31.5 |
25 |
15 |
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port T (internal pilot oil return) |
3 |
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port Y |
3 |
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Pilot oil volume(cm3) |
1.7 |
4.6 |
10 |
26.5 |
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Pilot oil flow at port X or Y (L/min) |
3.5 |
5.5 |
7 |
15.9 |
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Flow through main valve (L/min) |
270 |
460 |
877 |
1600 |
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Hysteresis (L/min) |
6 |
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Repeatability (%) |
3 |
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degree of contamination(㎛) |
≤20 |
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Fluid |
Mineral oil(for NBR seal).Phosphate ester (for FPM seal) |
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Viscosity range(mm ²/s) |
2.8 to 380 |
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Fluid temperature range (℃) |
-20 to +70 |
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Mounting position |
optional |
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Weight (kg) |
valve with one solenoid |
7.4 |
12.7 |
17.5 |
41.8 |
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valve with two solenoids |
7.8 |
13.4 |
18.2 |
42.2 |
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Electrical data |
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Type of supply |
DC |
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Nominal current of solenoid (A) |
0.8 |
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Coil resistance (Ω) |
cold (at20℃) 19.5; max.valve, hot 28.8 |
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Environment temperature (℃) |
50 |
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Coil temperature (℃) |
150 |
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Duty cycle |
Continuous |
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Pilot current (A) |
0.02 |
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Insulation |
IP65 |
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Associated |
With 1 ramp time |
VT-3000S30 |
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With 5 ramp times |
VT3006S30 |
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Electrical connection |
Plug connection |
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Features:
▶ Pilot direction WRH proportional valve
▶ For subplate mounting
▶ For the control of both direction and flow rate of a hydraulic fluid
▶ Spring centred .no spool drift
▶ Low pressure drop across control lands
▶ Valve and electronic control from one source
▶ Proportional solenoid operation
▶ Porting pattern to DIN 24 340 form A,ISO4401 and CETOP-RP121H
Application:
Type 4WRH proportional valve is widely used in various industries such as machine tools, metallurgy, light industry, mining, engineering, etc.
The type 4WRH valves are pilot operated proportional directional valves for external operation via pressure control valves.The function and principle is the same as that for valve type 4WRZ.The inter-connecting plate (12) connects the pilot connection A with connection T(Y) and pilot connection B with P(X).The pilot pressure at the main valve must be from 0.4 MPa to 2.5 MPa.so flow is either from P to A and B to T or P to B and A to T.
Structure of Proportional Directional Valves 4WRH
Pilot valve
The pilot valve is a proportional solenoid operated 3-way pressure reducing valve(type 3DREP6).Throttle insert are installed in port A and B,further details see the text of 3DREP6
Structure of pilot valve type 3DREP6
Symbol of Proportional Directional Valve 4WRH
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