H-4WEH22H7X/6EW110N9S2DAL/B10D3

The H-4WEH22H7X/6EW110N9S2DAL/B10D3 is manufactured by Bosch Rexroth for the WEH Directional Spool Valves series. It directs hydraulic flow between pump, actuator, and return lines in automated machinery. The valve has a nominal size of 25, coded W.H 22, giving passage dimensions suited to medium-high flow rates, and its 4-way layout supplies two working ports along with pressure and tank connections. A porting pattern conforming to ISO 4401-08-08-0-05 allows the body to bolt to standard sub-plates without adapter blocks. The spool is returned to its neutral position by hydraulic pressure, eliminating mechanical springs and maintaining consistent centering even under elevated temperatures. Shifting force is provided by a 6E high-power pilot valve, and that pilot stage receives oil from an external supply with an external return so that control pressure remains stable regardless of line fluctuations. A 1.0 mm throttle insert meters pilot flow to prevent pressure spikes, while discharge control S2 hardware lets the user adjust switching time to match cylinder dynamics.

Electrical integration uses a DIN EN 175301-803 type K4 connector, giving a sealed and keyed interface for solenoid wiring. A concealed manual override lets technicians reposition the spool during commissioning or power loss without exposing internal components. The unit requires fluid cleanliness of ISO 4406 class 20/18/15 to protect close-fitting lands from abrasion. Working ports P, A, and B can be pressurized to 350 bar, whereas the pilot supply must stay below 210 bar to avoid damaging the control stage. The pilot drain connection y, Ac tolerates up to 160 bar, and the tank port t can accept return pressures to 250 bar, permitting installation in systems with moderate backpressure. A built-in D3 secondary pressure reducing valve limits pilot circuit pressure to 45 bar so that shift characteristics remain constant even when main line pressure varies. Together these limits and devices define safe operating envelopes and ensure predictable performance in closed-loop hydraulic automation.