4WEH22J7X/6EW110N9ETS2DK25L/B10

The 4WEH22J7X/6EW110N9ETS2DK25L/B10 directional spool valve belongs to the WEH Directional Spool Valves series and is produced by Bosch Rexroth for hydraulic automation systems that require reliable flow path switching between pressure and working lines. The valve uses electro-hydraulic actuation, allowing an electrical signal to pilot hydraulic force for full spool movement in high-flow circuits. It is assembled on a subplate mounting interface, so installation involves bolting the body to a standard manifold rather than threading individual ports. A nominal size of NG25 defines the flow capacity and matches ISO valve cavities of the same size. Four ports are provided to connect pressure, two work lines, and tank, enabling typical four-way control of a double-acting actuator. The porting pattern follows ISO 4401-08-08-0-05, which guarantees interchangeability with other components that share this footprint. Three discrete spool positions are available, each formed by a J-coded spool that establishes the required open and blocked paths during operation. Pilot supply is routed internally from the P port, while pilot return discharges internally to the T port to simplify external piping.

Maximum operating pressure at ports P, A, and B is 280 bar, so the valve withstands typical industrial power levels without external boosting devices. Pilot circuits can be pressurized up to 210 bar, giving ample force to shift the spool even under full load. For spring-centered versions, the spool starts to move once pilot pressure reaches 10.5 bar, ensuring predictable response at low system pressure. Switching time can be tuned by the S2 discharge control feature, which meters pilot oil and lets the user balance speed against shock. A throttle insert with a 1.0 mm orifice, designated B10, further refines flow in the pilot gallery when additional damping is needed. A concealed N9 manual override is provided, allowing maintenance staff to shift the spool locally without energizing the solenoid while keeping accidental actuation unlikely in service. Component cleanliness is maintained at ISO 4406 class 20/18/15, limiting particulate contamination that could score the lands or stick the spool.