Bosch Rexroth | H-4WH25E6X
H-4WH25E6X/
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The H-4WH25E6X/ valve belongs to the WEH Directional Spool Valves series and is manufactured by Bosch Rexroth. Designed to route hydraulic flow in automated circuits, the unit follows the ISO 4401-08-08-0-05 porting pattern and is built in nominal size NG25 to match common manifold blocks. It supports a maximum operating pressure of 350 bar at ports P, A, and B, while the symbol E configuration allows a maximum flow of 650 l/min for high-volume circuits. Acceptable oil quality is limited to an ISO 4406 cleanliness class of 20/18/15 to protect internal lands and seals. Viscosity may range from a minimum of 2.8 mm²/s up to 500 mm²/s, and the fluid may reach 80 °C maximum (nbr). These limits ensure predictable spool movement and long-term sealing integrity.
For pilot actuation, the valve accepts up to 250 bar pilot pressure and requires at least 13 bar when a three-position spring-centered spool is installed; the pilot cavity volume for that arrangement is 14.2 cm³, influencing response time. A preload valve cracking pressure of 4.5 bar helps prevent unintended spool shifts during line transients. Installation calls for six M12 × 60 mounting screws under ISO 4762 and a tightening torque of 100 Nm to secure the body against the manifold face. Reliable function is maintained in ambient temperatures up to 50 °C (nbr) without derating. The design achieves an MTTFd of 150 years, reflecting a high statistical lifespan for safety-related duty.
Technical Specifications
Fluid Cleanliness (iso 4406)
20/18/15
Max Ambient Temperature (nbr)
50 C
Max Flow (symbol E, 350 Bar)
650 l/min
Max Fluid Temperature (nbr)
80 C
Max Operating Pressure (p,a,b)
350 bar
Max Pilot Pressure
250 bar
Max Viscosity
500 mm2/s
Min Pilot Pressure (3-spool, Spring)
13 bar
Min Viscosity
2.8 mm2/s
Mounting Screw Torque
100 Nm
Mounting Screws
6x M12 x 60 (ISO 4762)
Mttfd (en Iso 13849)
150 years
Nominal Size
NG25
Pilot Volume (3-spool, Spring)
14.2 cm3
Porting Pattern
ISO 4401-08-08-0-05
Preload Valve Cracking Pressure
4.5 bar
1620 Old Apex Road
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