Bosch Rexroth | H-4WEH25EA6X6EW110N9K4
H-4WEH25EA6X/6EW110N9K4
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The H-4WEH25EA6X/6EW110N9K4 valve belongs to the WEH Directional Spool Valves series and is manufactured by Bosch Rexroth for automated hydraulic circuits. It is a 4/3-way spool unit in size NG25, so it directs pressure to two actuator lines while providing a center position in a standardized interface footprint. Spool code E dictates the internal porting scheme, and with that configuration the valve accepts up to 700 l/min to accommodate high-flow power drives. Ports P, A, and B tolerate operating pressures to 350 bar, while port T sustains return pressures up to 250 bar, supporting closed-loop systems with elevated backpressure. Both pilot oil supply and pilot oil return are arranged externally, letting designers select independent control and exhaust circuits without influencing main flow paths.
The electrical connection follows DIN EN 175301-803 form K4, which permits a standard plug-in coil interface for quick replacement in the field. A concealed manual override labeled N9 is provided so the operator can shift the spool during power loss without exposing moving parts. The assembly requires oil cleanliness of ISO 4406 20/18/15, thereby defining filter rating for long service life. Pilot control pressure can be raised to 250 bar, whereas a spring-centered shift is secured when at least 13 bar is available, ensuring consistent actuation across load ranges. The separate pilot return Y may be pressurized to 160 bar, allowing the valve to exhaust into semi-pressurized manifolds. Each switch consumes 14.2 cm³ of pilot oil, data useful for sizing accumulators and control lines. An MTTFd of 100 years contributes to safety layer calculations in machinery directives.
Technical Specifications
Electrical Connection
DIN EN 175301-803 (K4)
Fluid Cleanliness Class
ISO 4406 (c) 20/18/15
Manual Override Type
Concealed (N9)
Max Flow (symbol E)
700 l/min
Max Operating Pressure (p, A, B)
350 bar
Max Pilot Pressure
250 bar
Max Pressure Port T
250 bar
Min Pilot Pressure (spring-centered)
13 bar
Mttfd
100 years
Pilot Oil Return
External
Pilot Oil Supply
External
Pilot Return Y Max Pressure (ac)
160 bar
Pilot Volume Per Switching
14.2 cm3
Spool Symbol
E
Valve Function
4/3-Way
Valve Size
NG25
1620 Old Apex Road
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