4WEH22E7X/6EW110N9ETSDAL/B10

The 4WEH22E7X/6EW110N9ETSDAL/B10 directional spool valve is produced by Bosch Rexroth for the WEH Directional Spool Valves series. It provides electrically initiated hydraulic control in automation circuits that need reliable shifting between supply and working lines. The valve uses electro-hydraulic actuation, so a small solenoid pilot moves the main spool after receiving an electrical signal. A 4-way flow path manages pressure, tank, and two work ports for bidirectional cylinder or motor control. Three positions with a spring-centered neutral allow load holding when the signal is removed, and the spring action demands a minimum pilot pressure of 10.5 bar to overcome centering forces. The NG25 nominal size defines the porting dimensions and supports medium-frame manifolds. Subplate mounting with the ISO 4401-08-08-0-05 pattern speeds replacement and standardizes installation. A 1.0 mm throttle insert identified by code B10 meters pilot oil to dampen spool velocity, while a pilot volume of 7.64 cm³ influences shift time. Fluid cleanliness must meet ISO 4406 20/18/15 to prevent wear in the precision lands.

Internal pilot routing simplifies plumbing because supply oil enters through passage ET and returns to tank through port T, while an additional internal Y path tolerates up to 160 bar for backpressure on the pilot return. The assembly passes up to 450 l/min when the spool symbol E is selected, providing high flow for fast actuator motion. Operating channels P, A, and B safely withstand 280 bar, allowing the valve to service modern high-pressure systems. The pilot stage is rated for 210 bar, which protects the solenoid and associated seals from overload during continuous duty. The valve is shipped as a balanced, spring-centered model so the main spool remains in neutral until adequate pilot supply arrives, preserving system stability during startup. By keeping all pilot functions inside the valve body, designers avoid external lines that could leak or vibrate loose. These pressure, flow, and routing limits define the safe working envelope and confirm suitability for precise directional control tasks in industrial hydraulic automation.