4WEH22E7X/6EG24N9ETDK25L/B10

The 4WEH22E7X/6EG24N9ETDK25L/B10 valve belongs to the WEH Directional Spool Valves series and is manufactured by Bosch Rexroth for hydraulic automation tasks that require dependable flow direction control. It uses electro-hydraulic actuation so a small pilot signal moves the main spool under pressure, allowing remote command from machine controllers. A 4-way flow path lets the valve connect pressure, tank, and two actuator lines for bidirectional cylinder movement. The NG25 size sets the mounting envelope and permits larger flow passages consistent with medium-to-high power circuits. Interfacing follows the ISO 4401-08-08-0-05 porting pattern, making the unit interchangeable with other standardized subplates. The spool coded E defines the overlap geometry that shapes opening and closing characteristics. A 24 V DC solenoid energizes the pilot stage, matching common industrial control voltages. A concealed manual override provides mechanical actuation for setup or emergency use while preventing accidental engagement. A 1.0 mm throttle insert identified by code B10 meters pilot oil to control shifting speed and reduce shock.

Rated flow reaches 450 l/min, so the valve can supply high-demand actuators without excessive pressure drop. Working pressure on ports P, A, and B is limited to 280 bar, whereas port T is permitted up to 250 bar, defining safe operating envelopes for supply and return lines. The pilot stage tolerates pressures up to 210 bar and requires at least 10.5 bar with the three-position spring-centered spool to achieve reliable shifting. Pilot oil is taken internally from the pressure port and is also returned internally, simplifying plumbing and minimizing external leakage points. A pilot volume of 7.64 cm³ must be filled during each command, which influences response time and energy consumption of the pilot circuit. These hydraulic limits and internal pilot features ensure repeatable directional control in integrated power units and machine manifolds.