H-4WEH25L6X/6EW110N9TK4/B08

The H-4WEH25L6X/6EW110N9TK4/B08 valve is produced by Bosch Rexroth as part of the WEH Directional Spool Valves series. Designed for hydraulic automation circuits, it directs pilot and main flow based on electrical commands to position actuators. Electro-hydraulic actuation allows a small solenoid signal to shift a hydraulic pilot stage, reducing required coil power. A spring-centered mechanism returns the main spool to neutral when the signal is removed, giving fail-safe centering. The flow paths follow a 4/3-way configuration so three discrete positions are available for metering supply, return, and work ports. With a nominal size of NG25, the interface matches standard 25 mm passage blocks in high-capacity systems. Mounting follows the ISO 4401-08-08-0-05 pattern which ensures interchangeability with other subplate valves of the same footprint. The spool is cut to symbol L, establishing the overlap and cross-connection geometry required for high flow at full system pressure. Pilot oil is supplied externally through port X so the pilot circuit can maintain pressure even when the main ports are unloaded.

For duty cycles demanding quick response at elevated flow, the valve passes up to 650 l/min at 350 bar when the L-design spool is fully shifted. The main gallery tolerates a continuous operating pressure of 350 bar, while the pilot stage works safely up to 250 bar, providing a wide control margin. Reliable switching begins at a pilot pressure of 13 bar, allowing the valve to function in low-pressure standby modes before reaching full system pressure. Pilot oil is returned internally through port T, simplifying external piping and reducing leak points. Electrical connection is made with a DIN EN 175301-803 K4 plug, so field wiring can use common molded connectors. A concealed manual override identified by code N9 lets maintenance staff stroke the spool without energizing the solenoid, aiding troubleshooting. A throttle insert with a 0.8 mm orifice, tagged B08, can be fitted to dampen pilot flow and prevent shock during rapid shifts. The assembled unit weighs 19.0 kg, a consideration for manifold support and handling equipment.