Bosch Rexroth | H-4WEH25E6X6EW110N9EK4B10D3V
H-4WEH25E6X/6EW110N9EK4/B10D3V
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The H-4WEH25E6X/6EW110N9EK4/B10D3V directional spool valve is manufactured by Bosch Rexroth for the WEH Directional Spool Valves series and directs hydraulic flow in automated circuits. It is supplied in size NG25, so it mates with manifolds that follow the 25 mm nominal interface. The assembly tolerates up to 350 bar on pressure ports P, A, and B, allowing it to shift cylinders that work at high force. A spring-centered spool requires at least 13 bar pilot pressure to move, while the pilot supply can be as high as 250 bar for fast response. A built-in reduction stage limits the pilot signal to 45 bar, protecting the control piston from overload. Pilot return through port Y may rise to 160 bar when an AC coil is used, so back-pressure does not hamper reset. Mounting follows the ISO 4401 porting pattern, and hydraulic cleanliness must be kept to class 20/18/15 to preserve sealing surfaces.
The service range covers ambient temperatures from −20 °C to 50 °C and fluid temperatures from −20 °C to 80 °C, making the valve suitable for equipment that faces seasonal weather changes. It accommodates hydraulic oils with viscosities between 2.8 mm²/s and 500 mm²/s, ensuring consistent spool travel from thin start-up fluids to thicker oils encountered in cold conditions. Installation uses M12 × 60 mounting screws; tightening each fastener to 100 N·m secures the body against the subplate and prevents leakage during pressure peaks. These mechanical details combine with the temperature and viscosity limits to define the environmental envelope for dependable operation. Collectively, the specified pressures, thermal limits, and mounting data show that the H-4WEH25E6X/6EW110N9EK4/B10D3V supports hydraulic automation tasks without additional conditioning components.
Technical Specifications
Cleanliness Class (iso 4406)
20/18/15
Max Ambient Temperature (nbr)
50 °C
Max Fluid Temperature (nbr)
80 °C
Max Operating Pressure (p, A, B)
350 bar
Max Pilot Pressure
250 bar
Max Pilot Return Pressure (y)
160 bar (AC)
Max Viscosity
500 mm²/s
Min Ambient Temperature (nbr)
–20 °C
Min Fluid Temperature (nbr)
–20 °C
Min Pilot Pressure (spring-centered)
13 bar
Min Viscosity
2.8 mm²/s
Mounting Screw Size
M12 x 60
Mounting Screw Torque
100 Nm
Pilot Pressure Reduction (d3)
45 bar
Porting Pattern
ISO 4401
Size
NG25 (W.H 25)
1620 Old Apex Road
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