The proportional directional valve 4WRZ adopts plate connection, which has the same connection size as the common reversing valve of the same diameter. It is easy to install and debug. The main valve of Huade® 4WRZ proportional valve is spring-centered. The main valve core has no drift, high repeatability and good reliability. The valve is CE certificated.
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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 WRZ 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 4WRZ proportional directional valve is widely used in various industries such as machine tools, metallurgy, light industry, mining, engineering, etc.
Valve types 4WRZ... are 4- way valves operated by means of proportional solenoids. They control the direction and flow rate of hydraulic fluid.
They basically consist of the pilot valve (3),the main valve (7) with the main spool (8),and the centering spring (9).
If solenoid ‘B’ is energized, 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 throttling grooves in the main spool open progressively with increasing current, thus controlling the flow of hydraulic fluid to the actuator ports.
When the electrical signal is switched off, both the pilot spool (4) ,and the main spool (8) return to neutral independent of the control pressure supply. An emergency hand operator permits movement of the pilot spool position without energizing the solenoids
Structure of Proportional Directional Valve 4WRZ
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 4WRZ
Address
No. 27, Yangsha Road, Huilong Town, Nantong City, Jiangsu Province, China
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