Bosch Rexroth | 4WH10H4X
4WH10H4X/
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The 4WH10H4X/ valve belongs to the WEH Directional Spool Valves series from Bosch Rexroth and is intended to route flow paths in hydraulic automation circuits. It employs hydraulic actuation to shift a 4-way spool, letting machinery switch between pressure, return, and work lines as needed. The unit is built in size NG10 so it fits manifolds that follow the ISO 4401-05-05-0-05 porting pattern. Spool movement is returned by hydraulic pressure rather than a spring, matching installations that already supply pilot oil. External pilot oil enters through port X and is drained through port Y; pilot pressure may rise to 250 bar while the main P, A, and B ports tolerate 350 bar without functional loss.
Subplate mounting allows the valve to drop onto a standardized interface, and four M6 × 45 screws fasten it with a tightening torque of 12.5 Nm to maintain seal integrity. Port T handles return flows up to 315 bar, while port Y withstands 250 bar so that remote drains remain safe under elevated backpressure. Oil entering the body must meet ISO 4406 (c) 20/18/15 cleanliness to protect the precision-ground spool lands from abrasion. The hydraulic design achieves a mean time to dangerous failure of 150 years under EN ISO 13849 calculations, supporting safety-related circuits that demand long diagnostic coverage.
Technical Specifications
Actuation Type
Hydraulic
Cleanliness Class
ISO 4406 (c) 20/18/15
Max Operating Pressure (p, A, B)
350 bar
Max Pilot Pressure
250 bar
Max Port T Pressure
315 bar
Max Port Y Pressure
250 bar
Mounting Screw Size
M6 x 45 (ISO 4762)
Mounting Type
Subplate Mounting
Mttfd (en Iso 13849)
150 years
Pilot Oil Return
External (Y)
Pilot Oil Supply
External (X)
Porting Pattern
ISO 4401-05-05-0-05
Size
NG10
Spool Return
Hydraulic
Tightening Torque
12.5 Nm
Way Configuration
4-Way
1620 Old Apex Road
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