Bosch Rexroth | H-4WEH25HD6XOF6EG96N9TK4
H-4WEH25HD6X/OF6EG96N9TK4
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The H-4WEH25HD6X/OF6EG96N9TK4 valve belongs to the WEH Directional Spool Valves series from Bosch Rexroth and is intended for precise flow direction in hydraulic automation. It uses electro-hydraulic actuation so an electrical signal can shift the spool with hydraulic power. Size NG25 defines the interface and supports medium-to-large circuit capacities, while two spool positions provide a simple on-off logic for the main flow paths. A hydraulic main spool return moves the element back to its rest state without external springs, and a concealed manual override (N9) lets technicians shift the spool when power is absent. Pilot oil is supplied externally through port X to isolate control pressure from the working lines, and it is returned internally to port T to minimize external tubing. The ISO 4401 porting pattern matches common subplates and manifolds, aiding standardization across machines.
The valve carries a maximum flow rating of 700 l/min to handle high volume circuits, and ports A and B can operate continuously at 350 bar to suit demanding pressure loops. The pilot stage withstands 250 bar, allowing the same supply to feed both control and working functions when needed. Port T is also rated to 250 bar so the unit tolerates elevated tank backpressure. Shifting occurs once the pilot pressure reaches 8 bar for the hydraulic end position, ensuring reliable actuation even with modest control sources. System fluid must meet ISO 4406 cleanliness code 20/18/15 to protect the close-fitting spool lands. Electrical connection is made through a DIN EN 175301-803 form K4 plug that fits standard industrial cable sets, and subplate mounting enables quick installation or replacement in modular hydraulic stations.
Technical Specifications
Actuation
Electro-Hydraulic
Cleanliness Class
20/18/15 (ISO 4406 (c))
Electrical Connection
DIN EN 175301-803 (K4)
Main Spool Return
Hydraulic
Manual Override
Concealed (N9)
Max Flow (hd, External X)
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 (2-pos, Hyd. End Pos)
8 bar
Mounting
Subplate Mounting
Pilot Oil Return
Internal To T
Pilot Oil Supply
External (X)
Porting Pattern
ISO 4401
Size
NG25
Spool Positions
2
1620 Old Apex Road
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