Proportional Directional Valves pilot operated type 4WRZ external pilot operated type 4WRH
- For subplate mounting
- For the control of both direction and flow rate of a hydranlic 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 DlN 24 340 form A,ISO4401 and CETOP-RP121H
Product features
◉ Pilot (WRZ) and direction (WRH) proportional valve
◉ For subplate mounting
◉ For the control of both direction and flow rate of a hydranlic 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 DlN 24 340 form A,ISO4401 and CETOP-RP121H
Functional section
Valve types 4WRZ... are 4- way valves operated by means of proportional solenoids.They control the direction and flow rate of hydraulic fluid.
They basiclly consist of the pilot valve (3) ,the main valve (7) with the main spool (8),and the centering spring (9).lf solenoid "B" is energised, pilot spool (4) is moved to the right.Pilot oil is then either fed internally from port P,or "externally" from port X via the pilot valve (3) into the pressure chamber (10) and moves the main spool (8) a distance proportional to the strength of the electrical current.The throtting grooves in the main spool open progressively with increasing current, thus controlling the flow of hydraulic fluid to the actuator ports.
When the electrical singal is switched off, both the pilot spool (4) ,and the main spool (8) return to neutral independent of the control pressure supply.An energency hand operator permits movement of the pilot spool position without energising the solenoids.
Technical data
(for applications outside these parameters, please consult us!)
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Hydraulic data |
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Size |
10 |
16 |
25 |
32 |
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pitol valve pressure (MPa) |
external pitol oil supply |
3 to 10 |
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internal pitol oil supply |
Up to 10 (over 10 must installate ZDR6DP3-30B/75YM) |
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Main valve pressure (MPa) |
31.5 |
35 |
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Return pressure (MPa) |
port T(external pitol oil return |
31.5 |
25 |
15 |
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port T(internal pitol oil return |
3 |
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port Y |
3 |
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Pilot oil volume or spool movement 0~100% |
(cm3) |
1.7 |
-4.6 |
10 |
26.5 |
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Pilot oil flow at port X or Y for spool movement 0~100% |
(L/min) |
3.5 |
-5.5 |
7 |
-15.9 |
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Flow throught 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 |
(μm) |
< 20 |
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Fluid |
Mineral oil (for NBR seal), Phosphate ester (for FPM seal) |
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Viscosity range |
(mm²/s) |
2.8 to 380 |
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Fluid temperature range |
(°C) |
-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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Norminal current of solenoid |
(A) |
0.8 |
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Coil resistance |
(Ω) |
cold (at20°C) 19.5;max.valve,hot 28.8 |
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Enviomment temperature |
(°C) |
+50 |
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Coil temperature |
(°C) |
+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 amplifier |
With 1 ramp time |
VT-3000S30 |
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With 5 ramp times |
VT-3006S30 |
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Electrical connection |
Plug connection |
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Valve movement with stepped electrical input singa
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