Bosch Rexroth | 4WRH32W6-520-7XM
4WRH32W6-520-7X//M
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The 4WRH32W6-520-7X//M proportional directional valve is part of the WRZ Proportional Directional Valves series produced by Bosch Rexroth for hydraulic automation where precise metering of actuator flow is required. It is built for a nominal size of 32, and the subplate mounting arrangement fits the ISO 4401-10-08-0-94 pattern to streamline manifold integration. The valve handles a nominal flow of 520 l/min at a 10 bar pressure drop, with 38 mm ports that maintain low velocity losses. A spool marked W6 establishes the internal flow paths for switching functions, while operation relies on mineral oil according to DIN 51524 HL or HLP grades. System reliability depends on keeping the fluid at or cleaner than class 20/18/15 per ISO 4406.
Maximum operating pressure is 350 bar, enabling the valve to control large cylinders without structural fatigue. The pilot stage uses an external oil supply and an external drain so cabinet pressure variations do not influence spool position. Pilot supply pressure must remain below 25 bar, port Y is limited to 30 bar, and port T can carry up to 150 bar of return flow, giving designers defined boundaries for auxiliary lines. NBR seals withstand the stated mineral oil and temperature range, maintaining separation of ports during continuous duty.
Technical Specifications
Fluid Cleanliness Class (main)
20/18/15 (ISO 4406)
Hydraulic Fluid
Mineral Oil (HL, HLP) DIN 51524
Max Operating Pressure
350 bar
Max Pilot Pressure (main Valve)
25 bar
Max Pressure (port Y)
30 bar
Max Return Pressure (port T)
150 bar
Mounting Type
Subplate Mounting
Nominal Flow (10 Bar Δp)
520 l/min
Nominal Size
32
Pilot Oil Drain
External
Pilot Oil Supply
External
Port Diameter (a/b/p/t)
38 mm
Porting Pattern
ISO 4401-10-08-0-94
Seal Material
NBR
Spool Symbol
W6
1620 Old Apex Road
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