Bosch Rexroth | H-4WEH25G6X6EG24K4QM0G24
H-4WEH25G6X/6EG24K4QM0G24
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The H-4WEH25G6X/6EG24K4QM0G24 directional spool valve belongs to the WEH Directional Spool Valves series manufactured by Bosch Rexroth for closed-loop hydraulic automation. Designed as a 4-way unit, it directs pressure fluid to actuators while allowing simultaneous return flow. With a nominal size of NG25, the housing adapts to medium-flow manifolds, and its electro-hydraulic actuation converts an electrical pilot signal into mechanical spool movement for precise switching. The interface follows the ISO 4401-08-08-0-05 porting pattern so that it bolts directly to standardized sub-plates. A DIN EN 175301-803 (K4) plug provides the electrical connection to control cabinets. Spool movement is initiated by a 6E high-power pilot valve supplied with 24 V DC, and the rest position of the main spool can be monitored through a dedicated 24 V DC signal, enabling position feedback to safety PLCs.
The hydraulic section passes up to 400 l/min through symbol G flow paths, supporting large cylinder or motor circuits without excessive pressure drop. Working ports P, A, and B withstand operating pressures up to 350 bar, while the tank port T is limited to 250 bar to safeguard return-line components. The pilot stage accepts pilot pressures up to 250 bar and requires at least 13 bar to center the spring-loaded spool, ensuring reliable actuation even in low-pressure standby conditions. Pilot oil is supplied externally via port X and returned externally through port Y so that system contamination does not influence the main flow. Fluid cleanliness must meet ISO 4406 20/18/15 to protect internal lands and reduce wear, maintaining consistent performance over the valve’s service life.
Technical Specifications
Actuation Type
Electro-Hydraulic
Cleanliness Class
ISO 4406 (c) 20/18/15
Electrical Connection
DIN EN 175301-803 (K4)
Max Flow (symbol G)
400 l/min
Max Operating Pressure (p, A, B)
350 bar
Max Operating Pressure (t)
250 bar
Max Pilot Pressure
250 bar
Min Pilot Pressure (spring-centered)
13 bar
Nominal Size
NG25
Pilot Oil Return
External (Y)
Pilot Oil Supply
External (X)
Pilot Valve Type
6E High-Power
Pilot Valve Voltage
24 V DC
Porting Pattern
ISO 4401-08-08-0-05
Spool Position Monitoring
Rest Position (24 V DC)
Valve Function
4-Way
1620 Old Apex Road
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