Bosch Rexroth | 4WRH25W9-325-7XV
4WRH25W9-325-7X//V
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The 4WRH25W9-325-7X//V proportional directional valve is produced by Bosch Rexroth for the WRZ Proportional Directional Valves series. It directs and meters hydraulic flow in automated motion circuits. The valve uses hydraulic actuation to shift its spool, allowing closed loop control without electrical solenoids. Nominal size 25 supports medium to high capacity manifolds, while the W9 spool symbol defines the flow paths available to machinery designers. Under a differential pressure of 10 bar, the nominal flow reaches 325 l/min, providing predictable performance for servo controlled cylinders. The main stage handles up to 870 l/min so oversized actuators can still move at commanded speed. A maximum operating pressure of 350 bar permits installation in high pressure systems common in presses or injection molding machines. The subplate mounting style speeds service changes, and the ISO 4401-08-07-0-94 porting pattern aligns with standard manifold hardware.
External pilot oil supply isolates control pressure from load variations, and an external pilot oil return prevents back pressure from influencing the amplifier stage. The pilot circuit tolerates up to 25 bar so it can be fed from low pressure auxiliary pumps. Port T can withstand 250 bar when an external drain is selected, allowing energy recovery circuits that return oil to the tank through back-pressure accumulators. Port Y is limited to 30 bar, ensuring the drain line protects the spool drive from excessive force. Approved HL or HLP fluids per DIN 51524 must be used to maintain lubrication and thermal stability, and FKM seals resist these mineral oils at elevated temperature. The main valve cavity requires cleanliness class ISO 4406 20/18/15 or better, which reduces wear on the precision metering edges. Together these characteristics let the valve provide repeatable flow control in centralized hydraulic automation systems.
Technical Specifications
Actuation
Hydraulic
Cleanliness Class (main Valve)
ISO 4406 20/18/15
Hydraulic Fluid
HL/HLP (DIN 51524)
Max Main Valve Flow
870 l/min
Max Operating Pressure
350 bar
Max Pilot Pressure (main Valve)
25 bar
Max Port T Pressure (ext Drain)
250 bar
Max Port Y Pressure
30 bar
Mounting Type
Subplate
Nominal Flow (Δp 10 Bar)
325 l/min
Nominal Size
25
Pilot Oil Return
External
Pilot Oil Supply
External
Porting Pattern
ISO 4401-08-07-0-94
Seal Material
FKM
Spool Symbol
W9
1620 Old Apex Road
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