H-4WEH25G6X/6EW110N9S2DA/V

The H-4WEH25G6X/6EW110N9S2DA/V valve is produced by Bosch Rexroth within the WEH Directional Spool Valves series and is applied to route hydraulic flow in automated machinery. A concealed manual override lets technicians shift the spool during commissioning or power loss while keeping moving parts protected. It stays functional in ambient temperatures up to 50 °C, allowing use beside warm hydraulic power units. The spool G layout in size NG25 accommodates flow rates to 400 l/min, delivering the volume demanded by large cylinders. Ports P, A, and B tolerate operating pressure to 350 bar, so heavy-duty actuators can be fed without derating. The NG25 size ensures interchangeability with other components sized for 25 mm nominal passages. FKM seals resist common hydraulic oils and high temperature, preserving leakage integrity. Three spool positions furnish a neutral and two working directions for precise control, and the four-way porting links pressure, tank, and dual actuator lines for bidirectional motion.

Hydraulic fluid temperatures can reach 80 °C without impairing service life, supporting circuits where oil is returned hot from work zones. The pilot stage accepts pressures up to 250 bar to guarantee firm spool shift even under load, and port Y withstands 160 bar so drain lines remain secure. When spring-centering is used, the spool moves only after 13 bar pilot pressure is supplied, preventing unintended actuation during low-pressure start-ups. A manifold connection patterned to ISO 4401-08-08-0-05 simplifies block mounting in standardized stacks. The dual solenoids operate on 110 V AC at 50 or 60 Hz, matching common plant supplies without transformers. Internal flow geometry follows spool symbol G, defining the center bypass paths required by many industrial circuits. A spring-centered assembly weighs 19.0 kg, so mounting hardware must support that mass when the valve is installed on vertical plates.