Bosch Rexroth | 4WRH32W6-520-7XV
4WRH32W6-520-7X/V
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The 4WRH32W6-520-7X/V proportional directional valve belongs to the WRZ Proportional Directional Valves series and is manufactured by Bosch Rexroth. It directs flow in hydraulic automation circuits with an electrically positioned spool. A nominal flow of 520 l/min at a 10 bar pressure drop lets the valve support high-volume systems, while subplate mounting simplifies replacement. The ISO 4401-10-08-0-94 porting pattern matches standard manifolds, and 38 mm passages on ports A, B, P, and T limit pressure loss. The main stage withstands 350 bar, enabling installation in high-pressure lines. An external pilot oil supply isolates the control stage from pump fluctuations, and an external pilot drain routes pilot flow to tank. With the external drain, return port T may see up to 150 bar, so back-pressure-controlled circuits remain possible.
The pilot stage tolerates 25 bar, providing adequate force for spool movement, and hysteresis is kept at or below 6 percent for repeatable actuator positioning. Mineral oil of the HL or HLP classes serves as the working fluid, and a viscosity range of 20 to 380 mm²/s maintains stable response. Fluid cleanliness must reach 20/18/15 per ISO 4406 to guard the metering edges, and FKM seals resist oil and heat. The valve functions between −20 and +80 °C, covering both mobile and stationary applications. Port Y is limited to 30 bar to prevent control distortion, completing a specification set that delivers consistent proportional flow control across varied hydraulic conditions.
Technical Specifications
Fluid Cleanliness (main Valve)
20/18/15 (ISO 4406)
Fluid Temperature Range
−20 to +80 °C
Hydraulic Fluid
Mineral Oil (HL, HLP)
Hysteresis
≤ 6%
Max Operating Pressure (main Valve)
350 bar
Max Pilot Pressure (main Stage)
25 bar
Mounting Type
Subplate Mounting
Nominal Flow (10 Bar Δp)
520 l/min
Pilot Oil Drain
External
Pilot Oil Supply
External
Port Size (a, B, P, T)
Ø38 mm
Port Y Pressure
30 bar
Porting Pattern
ISO 4401-10-08-0-94
Return Port T Pressure (ext Drain)
150 bar
Seal Material
FKM
Viscosity Range
20 to 380 mm²/s
1620 Old Apex Road
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