Bosch Rexroth | 4WH10HD4X
4WH10HD4X/
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The 4WH10HD4X/ directional spool valve belongs to the WEH Directional Spool Valves series from Bosch Rexroth. It is used to shift hydraulic flow paths in automation circuits that require dependable directional control. Hydraulic actuation moves the spool, allowing a 4-way flow pattern that can drive double-acting cylinders or motors. Two discrete spool positions provide extend-retract or open-close functions without intermediate states. The valve is built to the NG10 nominal size, so its ports match other size-10 components in a manifold stack. With a symbol Hd configuration, it passes up to 160 l/min, supporting medium-capacity machines. Ports P, A, and B withstand operating pressures up to 280 bar, enabling use in high-pressure systems. The internal channels follow the ISO 4401-05-05-0-05 porting pattern, which simplifies subplate selection during design. Spool return in the main valve is hydraulic, so the pilot circuit must generate the return stroke instead of relying on springs.
System reliability and service conditions are addressed by the remaining features. The valve accepts fluid that meets ISO 4406 class 20/18/15, meaning contamination must be controlled to that level to prevent wear or jamming. Pilot lines may supply up to 250 bar, while the hydraulic end position is reached with a minimum pilot pressure of 7 bar, ensuring consistent shifting under varying loads. Drain port T tolerates 280 bar, and external drain port Y can handle 250 bar, so back-pressure in return lines does not impair operation. Subplate mounting is specified, allowing compact manifold installation; four M6 × 45 screws secure the body to the base plate and provide proper sealing compression. This mounting approach shortens pressure passages and keeps maintenance simple in modular power units. A mean time to dangerous failure of 150 years (Mttfd) supports functional-safety calculations for long-life equipment.
Technical Specifications
Actuation Type
Hydraulic
Cleanliness Class
ISO 4406 20/18/15
Max Operating Pressure (p, A, B)
280 bar
Max Pilot Pressure
250 bar
Max Pressure Port T
280 bar
Max Pressure Port Y (external)
250 bar
Maximum Flow (ng10, Symbol Hd)
160 l/min
Min Pilot Pressure (hydraulic End Position)
7 bar
Mounting Screws
4x M6 x 45
Mounting Type
Subplate Mounting
Mttfd (type Wh)
150 years
Nominal Size
NG10
Porting Pattern
ISO 4401-05-05-0-05
Spool Positions
2
Spool Return In Main Valve
Hydraulic
Way Configuration
4-Way
1620 Old Apex Road
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