The type HD-4WRZ valves are 4-way valves which are actuated via proportional solenoids. They are used to control the direction and rate of flow. Huade Hydraulic has introduced high technology from Rexroth. After years of independent research and development, the proportional valves produced by Huade has excellent performance, which can be comparable to those of top-tier brands.
Proportional Directional Valve 4WRZ-7X
TECHNICAL REPLACEMENT NOTICE
This Huade® directional control valve serves as a 100% direct drop-in replacement for Bosch Rexroth PROPORTIONAL-DIRECTIONAL-VALVE-4WRZ-7X equivalents. Dimensions, mounting interfaces, and technical parameters are identical. Designed for cost reduction in industrial and mobile hydraulic systems.
• Product features: Spring centered control spool
• Specifications:4WRZ-7X series,
• Applications: control the direction and rate of flow.
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ISO 4401 Mounting
ISO 4401 / Rexroth interchangeable
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Technical Data Sheet
- Product Overview
- Features & Applications
- Technical Parameters
Product Overview
Key Features
- Pilot operated proportional directional valve
- For subplate mounting
- The control of direction and rate of flow
- Spring centered control spool
- Valve and proportional control electronics from a single source
Industrial Applications
- The function of HD-4WRZ valves is to control the direction and rate of flow.
- The valve basically comprises of: pilot valve ①, main spool ④, main valve ⑥, and centering spring ③. With the solenoid B in the de-enegised condition the control spool ② move to the right.The pilot oil supply to the pilot valve is internal via port P or external via port X. Pilot oil flows via the pilot valve ① into the pressure chamber and moves the main spool ④ in proportion to the electrical input signal.The connection from P to A and from B to T is via orifice type cross-sections with progressive flow characteristics.
- With the solenoid A in the de-enegised condition the main spool move to the left.The connection from P to B and from A to T. De-energisation of the solenoid, the control spool and pilot spool ④ are moved back into their centre positions.
- Symbol of Proportional Directional Valve 4WRZ-7X
- Pilot oil supply
Technical Parameters
Mechanical ratings and operating limits for the Proportional Directional Valve 4WRZ-7X:
| Parameter / Dimension Name | Value / Rating Specification |
|---|---|
| Hydraulic | Hydraulic |
| Nominal size - - 10 - 16 - 25 | 32 |
| Operating pressure - pilot oil supply external - 3~10 | 3~10 |
| -Pilot valve (MPa) - pilot oil supply internal - 10~31.5 - 10~35 | 10~35 |
| -Main valve (MPa) - 31.5 - 35 | 35 |
| Return line pressure (MPa) - Port T (pilot oil drain extermal) - 31.5 - 25 | 15 |
| Return line pressure (MPa) - Port T (pilot oil drain intermal) - 3 | 3 |
| Return line pressure (MPa) - Port Y - 3 | 3 |
| Pilot oil volume (cm3) for spool movement 0~100% - 1.7 - 4.6 - 10 | 26.5 |
| Pilot oil flow at port X and Y (L/min) for stepped form of input signal 0~100% - 3.5 - 5.5 - 7 | 15.9 |
| Flow through main valve (L/min) - 170 - 460 - 870 | 1600 |
| Hysteresis % - ≤6 | ≤6 |
| Pressure fluid - Mineral oi1 to DIN 51 524 | Mineral oi1 to DIN 51 524 |
| Pressure fluid temperature range (℃) - -20~80 | -20~80 |
| Viscosity range (mm2/s) - 20~380 | 20~380 |
| Installation - optional, preferably horizontal | optional, preferably horizontal |
| Weight for version WRZ... (for WRZE"additionally 0.2kg) - 7.8 - 13.4 - 18.2 | 42.2 |
