Bosch Rexroth | 4WEH22D7XOF6EW110N9K4
4WEH22D7X/OF6EW110N9K4
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The 4WEH22D7X/OF6EW110N9K4 valve belongs to the WEH Directional Spool Valves series and is produced by Bosch Rexroth. It directs hydraulic flow in automated circuits by shifting a D spool to connect or block specific passages. The body is built in nominal size NG25 to match systems with medium flow requirements. A maximum operating pressure of 280 bar is supported at ports P, A, and B, allowing use in high-pressure machines. Pilot control oil is supplied externally through the X port, while the return oil exits through the Y port, which keeps the main channels free of pilot flow. The solenoid coil connects through a K4 plug conforming to DIN EN 175301-803 for standardized wiring. A concealed N9 manual override permits local actuation if electrical power is unavailable. The spool spring design needs at least 11 bar pilot pressure to shift reliably.
The pilot stage can accept up to 210 bar supply pressure, and the return path tolerates 160 bar when operated with AC voltage, which preserves consistent shifting speed. Mounting follows the ISO 4401-08-08-0-05 porting pattern and uses six M12 × 60 screws to lock the valve to the subplate. Each screw is tightened to 100 Nm to maintain seal integrity under load. Hydraulic fluid must meet cleanliness class 20/18/15 according to ISO 4406 to protect the precision spool lands from wear. The design achieves a mean time to dangerous failure of 100 years, reflecting the robustness of the internal components. These characteristics fit the valve for long-term service in motion control manifolds and centralized power units.
Technical Specifications
Electrical Connection
K4 (DIN EN 175301-803)
Fluid Cleanliness
20/18/15 (ISO 4406)
Manual Override
N9 (Concealed)
Max Operating Pressure (p/a/b)
280 bar
Max Pilot Pressure
210 bar
Max Pilot Return Pressure (y)
160 bar (AC)
Min Pilot Pressure (2-spool, Spring)
11 bar
Mounting Screws
M12 x 60 (Qty 6)
Mttfd
100 years
Nominal Size
NG25
Pilot Oil Return
External (Y Port)
Pilot Oil Supply
External (X Port)
Porting Pattern
ISO 4401-08-08-0-05
Screw Tightening Torque
100 Nm
Spool Symbol
D
1620 Old Apex Road
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