Bosch Rexroth | H-4WEH25E6X6EW110N9DA
H-4WEH25E6X/6EW110N9DA
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The H-4WEH25E6X/6EW110N9DA valve belongs to the WEH Directional Spool Valves series and is manufactured by Bosch Rexroth for hydraulic automation circuits where controlled flow direction is required. It uses electro-hydraulic actuation so an electrical signal drives a pilot stage that moves the main spool. The 4-way flow path provides separate pressure, return, and two work ports to manage actuator movement. Its nominal size NG25 defines the port diameter and matches systems that use size 25 interfaces. The e-type spool allows a maximum flow of 700 l/min, enabling high-volume transmission without excessive pressure drop. The main ports p, a, and b withstand 350 bar, while stable operation of the spring-centered version begins at a pilot pressure of 13 bar. External pilot oil supply identified as port X isolates control pressure from the main line, and the ISO 4401-08-08-0-05 mounting pattern standardizes manifold installation.
External pilot oil return designated as port Y prevents pilot pressure from influencing tank circuits and completes the control loop. The pilot stage tolerates up to 250 bar, and the t port is rated for 250 bar so back-pressure in the return line does not damage seals. A concealed N9 manual override lets maintenance personnel shift the spool without energizing the solenoid. Fluid cleanliness must be maintained at 20/18/15 per ISO 4406 to protect the servo edges from wear. Manifold attachment uses six M12 × 60 bolts according to ISO 4762, and each bolt is tightened to 100 Nm to secure the body against leakage. The design achieves a mean time to dangerous failure of 100 years, reflecting high reliability for safety-related installations.
Technical Specifications
Actuation Type
Electro-Hydraulic
Cleanliness Class
20/18/15 (ISO 4406)
Manual Override
Concealed (N9)
Max Flow (e Spool)
700 l/min
Max Operating Pressure (p,a,b)
350 bar
Max Pilot Pressure
250 bar
Max Pressure (t Port)
250 bar
Min Pilot Pressure (3-pos Spring)
13 bar
Mounting Pattern
ISO 4401-08-08-0-05
Mounting Screws
6× M12×60 (ISO 4762)
Mttfd (type Weh)
100 years
Nominal Size
NG25 (W.H 25)
Pilot Oil Return
External (Y)
Pilot Oil Supply
External (X)
Screw Tightening Torque
100 Nm
Way Configuration
4-Way
1620 Old Apex Road
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