Bosch Rexroth | H-4WEH25HC6XOF6EW110N9K4
H-4WEH25HC6X/OF6EW110N9K4
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The H-4WEH25HC6X/OF6EW110N9K4 valve is manufactured by Bosch Rexroth within the WEH Directional Spool Valves series. It provides electro-hydraulic actuation so an electrical signal moves the NG25 spool to direct fluid during automated machine cycles. Two hydraulic end positions allow simple open or closed routing when a subplate-mounted body sits horizontally in a manifold. The ISO 4401 porting pattern aligns with standard base plates, and the closed type-E port X prevents pilot leakage into adjacent channels. Internal pilot oil supply marked E feeds the control stage, while an external Y port returns pilot oil to tank so pressure shocks are not routed back into the main gallery. A pilot flow of 35 l/min is required to reach the shortest switching time, supporting high-response directional changes in presses or plastic machines.
Maximum service pressure is 350 bar on ports P, A, and B, with a reduced 250 bar limit on port T to protect the return line. The valve uses a DIN EN 175301-803 K4 electrical connector, giving standardized pin allocation for the solenoid coil. ISO 4406 cleanliness class 20/18/15 oil must be maintained to preserve wear life, which is further extended by a mean time to dangerous failure of 100 years. A 100 µm surface coating resists corrosion in damp plant environments, and the horizontal installation position simplifies wiring access to the connector. The spool seats on a subplate interface, so maintenance involves removing four bolts rather than disturbing pipework. These characteristics deliver reliable directional control in hydraulic automation while keeping component counts low.
Technical Specifications
Actuation Type
Electro-Hydraulic
Cleanliness Class
ISO 4406 20/18/15
Electrical Connection
DIN EN 175301-803 (K4)
Installation Position
Horizontal
Max Pressure (p,a,b)
350 bar
Max Pressure (t)
250 bar
Mounting Type
Subplate
Mttfd
100 Years
Pilot Flow For Shortest Switching Time
35 l/min
Pilot Oil Return
External (Y)
Pilot Oil Supply
Internal (E)
Port X
Closed (Type E)
Porting Pattern
ISO 4401
Size
NG25
Spool Positions
2 (Hydraulic End Position)
Surface Coating Thickness (max)
100 µm
1620 Old Apex Road
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