4WEH22E7X/6EW110N9DAL

The 4WEH22E7X/6EW110N9DAL directional spool valve belongs to the WEH Directional Spool Valves series and is manufactured by Bosch Rexroth. It shifts flow paths in hydraulic automation circuits, allowing actuators to extend or retract under command. Its nominal size of NG25 matches manifolds that use 25 mm port diameters, giving adequate passage area for medium-to-high flow stages. The porting pattern conforms to ISO 4401-08-08-0-05 so the valve can drop into standard sub-plates without re-machining. Spool symbol E identifies the internal land arrangement that connects pressure to port A or B while blocking the opposite side. With that spool, the assembly passes up to 450 l/min, a flow limit sized for large cylinders or motors. Working ports P, A, and B may see pressures as high as 280 bar, providing a safety margin for heavy-duty circuits. Return port T endures 250 bar, enabling back-pressure operation when long lines or counterbalance valves are present. The spring-centered return forces the spool back to neutral once the pilot signal is removed, restoring all ports to the closed position. Internal pilot actuation begins at 4.5 bar, so low pilot supply lines can still shift the spool.

Pilot supply lines may rise to 210 bar without damaging the control stage, while the internal drain at port Y is limited to 160 bar to protect seal integrity. Installation uses six M12 × 60 (10.9) screws, supplying the clamping force needed for a rigid interface with the sub-plate. Each screw is tightened to 100 Nm to prevent loosening under pressure cycling. Hydraulic cleanliness must not exceed ISO 4406 (c) 20/18/15; this level minimizes spool wear and sticking. The valve weighs 11.9 kg when equipped with two solenoids, a mass that affects handling during maintenance or retrofit work. Its mean time to dangerous failure is rated at 100 years, supporting long-term reliability targets in safety-related hydraulic systems.