Bosch Rexroth | H-4WH10E4X
H-4WH10E4X/
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The H-4WH10E4X/ directional spool valve belongs to the WEH Directional Spool Valves series and is produced by Bosch Rexroth for hydraulic automation that demands reliable flow reversal and load holding. It employs hydraulic actuation, and external pilot oil ports X and Y shift the spool without relying on electrical solenoids. The unit follows a 4/3-way layout to route pressure, tank, and service lines in three distinct positions. A nominal size of NG10 supports systems that use standardized subplates, and the ISO 4401-05-05-0-05 mounting interface allows quick installation on those bases. The valve passes up to 160 l/min, matching medium-capacity circuits, while ports P, A, and B withstand operating pressures to 350 bar so high-pressure pumps can be used without derating. Its 5.5 kg mass makes handling straightforward during assembly and service.
A viscosity range from 2.8 to 500 mm²/s permits operation with a wide selection of mineral or synthetic hydraulic oils. The design endures ambient temperatures between –20 °C and +50 °C and tolerates fluid temperatures from –20 °C to +80 °C, so equipment can start cold and run hot in the same shift. Fluid cleanliness must reach ISO 4406 (c) 20/18/15 to keep the spool land clearances free of abrasion. Pilot control is available up to 250 bar, and the spring-centered spool returns to neutral once pilot pressure falls below 12 bar. Return port t and external drain Y handle continuous service at 315 bar, while the separate external y line is limited to 250 bar, allowing designers to split tank functions by pressure level.
Technical Specifications
Actuation
Hydraulic
Ambient Temperature Range (nbr)
–20 to +50 °C
Cleanliness Class
ISO 4406 (c) 20/18/15
Hydraulic Fluid Temp Range (nbr)
–20 to +80 °C
Max Flow (symbol E, Ng10)
160 l/min
Max Operating Pressure (p, A, B)
350 bar
Max Operating Pressure (t, Y Ext)
315 bar
Max Operating Pressure (y External)
250 bar
Max Pilot Pressure
250 bar
Min Pilot Pressure (spring-centered)
12 bar
Mounting Interface
ISO 4401-05-05-0-05
Nominal Size
NG10
Pilot Oil Ports
X External; Y External
Valve Function
4/3-Way
Viscosity Range
2.8 to 500 mm²/s
Weight
5.5 kg
1620 Old Apex Road
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