H-4WEH25G6X/6EW110N9TS2DA

The H-4WEH25G6X/6EW110N9TS2DA directional spool valve is produced by Bosch Rexroth as part of the WEH Directional Spool Valves series. It is designed to shift hydraulic flow paths in automated machinery that needs quick and repeatable actuation. Electro-hydraulic actuation allows an electrical pilot signal to move the main spool without direct manual force. The unit follows a 4-way configuration so it can connect pressure, tank, and two service lines during each switching state. A G-type spool provides three functional positions, and springs center the spool when the pilot signal is absent to resume a neutral condition. The nominal size is NG25, identified within Bosch Rexroth nomenclature as W.H 25, which matches ISO 4401-08 cavity dimensions. Subplate mounting simplifies replacement because the body bolts onto a standard interface rather than being threaded directly into pipe work. The porting pattern corresponds to ISO 4401-08-08-0-05, ensuring interchangeability with common industrial manifolds.

The valve permits a continuous flow rate up to 400 l/min so circuits with high demand can be supplied without excessive pressure drop. Its main stage withstands operating pressures to 350 bar, while the pilot stage tolerates pressures up to 250 bar and requires at least 13 bar to initiate movement. Pilot oil is introduced through an external X port, allowing designers to choose a stable control pressure independent of the main line. Return oil from the pilot stage is routed internally to the tank, identified by the T path, which removes the need for a separate drain line. The Y port remains closed in this T version, preventing external leakage points on the manifold face. A concealed N9 manual override permits emergency spool shifting without exposing the plunger to accidental operation. Discharge control marked S2 provides an adjustable restriction that lets technicians fine-tune switching times to match system dynamics. These hydraulic and control characteristics combine to give reliable directional control in automated systems running at high pressure and flow.