4WH10Y4X/

The 4WH10Y4X/ directional spool valve is produced by Bosch Rexroth and belongs to the WEH Directional Spool Valves series, where it shifts hydraulic flow paths in automated machinery. With a nominal size of 10 (NG10), the valve matches circuit manifolds designed for medium-flow industrial actuators. Its subplate mounting interface fastens the body directly to standardized base plates, reducing installation time. The porting pattern follows ISO 4401-05-05-0-05 so that manifold drillings remain consistent across equipment lines. Six working ports—P, A, B, T, X, and Y—provide pressure supply, work, tank, and pilot connections needed for external control loops. Pilot oil is supplied externally through port X, allowing independent pressure regulation separate from the main line. Return oil leaves through the external Y port, preventing pilot flow from entering the tank gallery inside the valve block. Two spool positions enable a simple on/off switching function between the selected flow paths. The housing weighs 5.5 kg, which permits manual handling during service while still offering sturdy construction. The required oil cleanliness class of ISO 4406 20/18/15 limits particle contamination to protect the precision-ground spool and bore.

The valve accommodates a maximum flow of 160 l/min in symbol Y circuits, giving adequate throughput for large cylinders or motors. Operating channels P, A, and B can be pressurized up to 280 bar, supporting high-force motion sequences. Port T shares the same 280 bar limit, letting designers route back pressure applications without exceeding case strength. Port Y is rated for 250 bar, which aligns with typical pilot line constraints. Pilot stages may be supplied up to 250 bar, while a minimum of 10 bar is required to shift the spool reliably. The mean time to dangerous failure is 150 years, indicating a very low probability of functional loss throughout the equipment life cycle. Together, these pressure and reliability ratings make the valve suitable for continuous duty in press lines, molding presses, and automated test rigs. Combined with the defined flow rating, these limits ensure predictable response across the full operating envelope of modern hydraulic power units.