4WEH22E7X/6EW110N9ETDAL/B10V

The 4WEH22E7X/6EW110N9ETDAL/B10V directional valve is produced by Bosch Rexroth within the WEH Directional Spool Valves series. It directs pressurized oil to actuators in automated hydraulic systems where electrical signals must initiate precise flow changes. The 4-way flow pattern provides two controlled work ports and separate pressure and tank lines so cylinders can extend and retract under command. Electro-hydraulic actuation allows the main spool to be shifted by a pilot stage that is energized through solenoids, enabling fast remote switching. The NG25 port size defines mounting and passage dimensions that balance compact envelope with adequate flow for medium-duty drives. Three available spool positions let the circuit move, stop, or center the actuator depending on control input. The E spool coding specifies the internal land geometry that establishes each of those flow paths. Pilot supply and return are both taken internally, eliminating external pilot plumbing and simplifying manifold installation. A concealed manual override is present so technicians can operate the valve during commissioning or when power is unavailable. A 1.0 mm throttle insert in the pilot gallery tempers flow to reduce pressure spikes during transitions.

The valve passes up to 450 l/min, allowing high actuator speeds in large machinery. Working ports P, A, and B withstand continuous pressures to 280 bar, supporting high-force cylinders without risk of spool seizure. Pilot control components tolerate a maximum of 210 bar so pump settings must remain within this limit. The unit remains functional once pilot pressure exceeds 10.5 bar in the spring-centered design, ensuring reliable shifting even at low system pressures. Drain port Y can be internally subjected to 160 bar, accommodating circuits where back-pressure builds in the return line. Each actuation consumes 7.64 cm³ of pilot oil, data that lets designers size accumulators and timing elements. FKM seals are used to resist high-temperature hydraulic fluids and many synthetic oils common in industrial plants. The assembly weighs 11.9 kg when equipped with two solenoids and the centering spring, a mass manageable for single-person installation. Together, these pressure limits define the safe operating range for the valve body and its pilot stage. These characteristics allow the component to manage rapid cylinder motions while maintaining controlled pilot performance.