Bosch Rexroth | 4WEH22E7X6EW110N9TK4
4WEH22E7X/6EW110N9TK4
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The 4WEH22E7X/6EW110N9TK4 valve belongs to the WEH Directional Spool Valves series manufactured by Bosch Rexroth for hydraulic automation tasks. It employs a 4/3-way spool arrangement to direct flow among four ports, and the E spool profile establishes the flow paths used in the center and shifted positions. A nominal size of NG25 (identified as W.H 22) supports medium to high flow circuits. The valve can pass up to 450 l/min when the E spool is fully actuated, enabling large-volume actuation of cylinders or motors. Pressure at ports P, A, and B can reach 280 bar, so the unit suits high-pressure plant hydraulics. Fluid cleanliness must not exceed ISO 4406 code 20/18/15 to protect the spool and body surfaces. Mounting is on sub-plates that follow porting pattern ISO 4401-08-08-0-05, ensuring interchangeability within standardized manifolds.
Electrical actuation uses a DIN EN 175301-803 K4 plug, simplifying wiring of the two solenoids during installation. With both solenoids and spring centering fitted, the assembly weighs 11.9 kg, which remains manageable for direct manifold mounting. Pilot oil is supplied externally through port X so the shifting force is independent of main line pressure, and the pilot flow is returned internally to port T, eliminating the need for a separate drain line. For reliable shifting, the spring-centered design needs at least 10.5 bar pilot pressure, while the pilot circuit must not exceed 210 bar to protect the control stage. Each actuation moves 7.64 cm³ of pilot fluid, a volume that influences response time and pump sizing. The tank port may see up to 250 bar, permitting back-pressure without risking case leakage. An MTTFd of 100 years supports long service intervals within safety-related systems.
Technical Specifications
Cleanliness Class
ISO 4406 20/18/15
Electrical Connection
DIN EN 175301-803 (K4)
Max Flow (symbol E)
450 l/min
Max Operating Pressure (p, A, B)
280 bar
Max Pilot Pressure
210 bar
Max Tank Port Pressure (t)
250 bar
Min Pilot Pressure (spring-centered)
10.5 bar
Mttfd
100 years
Pilot Oil Return
Internal (T)
Pilot Oil Supply
External (X)
Pilot Volume (spring-centered)
7.64 cm³
Porting Pattern
ISO 4401-08-08-0-05
Size
NG25 (W.H 22)
Spool Symbol
E
Valve Function
4/3-Way
Weight (two Solenoids, Spring-centered)
11.9 kg
1620 Old Apex Road
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