Bosch Rexroth | H-4WEH25E6X6EW110N9K4
H-4WEH25E6X/6EW110N9K4
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The H-4WEH25E6X/6EW110N9K4 valve is manufactured by Bosch Rexroth within the WEH Directional Spool Valves series and regulates oil flow in automated hydraulic circuits. It is built in a 4-way configuration so four ports can direct pressure, return, and actuator lines without external manifolds. The NG25 size defines passage dimensions for high-capacity systems, while spool symbol E establishes the internal flow paths used during each switching state. Main ports P, A, and B withstand up to 350 bar, enabling the valve to drive large cylinders at full system pressure. A maximum flow of 650 l/min at that pressure maintains velocity in high-demand motion sequences. The tank port tolerates 250 bar to protect the return circuit, and the drain port rating of 160 bar limits back pressure on the pilot stage. A 6E high-power pilot valve shifts the main spool; it needs at least 13 bar but no more than 250 bar pilot pressure, balancing quick response with component safety.
The mounting face follows porting pattern ISO 4401-08-08-0-05 so the unit bolts directly to common subplates without adapters. Proper clamping is achieved by torquing the mounting screws to 100 Nm, preventing leakage under load reversals. The spring-centered two-solenoid version weighs 19.0 kg, a consideration for lifting devices during installation. A concealed manual override lets maintenance staff move the spool mechanically when electrical power is unavailable. System cleanliness must reach ISO 4406 20/18/15 to keep the precision lands free of abrasive wear. The mean time to dangerous failure is 100 years, providing long functional safety intervals in continuous-duty machinery.
Technical Specifications
Cleanliness Class
ISO 4406 20/18/15
Manual Override
Concealed
Max Flow (symbol E At 350 Bar)
650 l/min
Max Operating Pressure (p, A, B)
350 bar
Max Pilot Pressure
250 bar
Max Pressure (port T)
250 bar
Max Pressure (port Y, Ac)
160 bar
Min Pilot Pressure (3-pos Spring-centered)
13 bar
Mounting Screw Torque
100 Nm
Mttfd
100 years
Pilot Valve
6E High-Power
Porting Pattern
ISO 4401-08-08-0-05
Size
NG25
Spool Symbol
E
Way Configuration
4-Way
Weight (2 Solenoids, Spring-centered)
19.0 kg
1620 Old Apex Road
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