Bosch Rexroth | 4WEH22G7X6EW110N9EK4B10P45
4WEH22G7X/6EW110N9EK4/B10P4.5
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The 4WEH22G7X/6EW110N9EK4/B10P4.5 valve belongs to the WEH Directional Spool Valves series produced by Bosch Rexroth for controlled hydraulic actuation. Its electro-hydraulic actuation shifts the main spool through an integrated pilot stage, allowing remote electrical control in automation circuits. The NG25 nominal size defines the flow path and matches installations that use the “W.H 22” cavity. Subplate mounting lets the unit be removed without disturbing pipework, and the ISO 4401-08-08-0-05 porting pattern aligns the pressure and service ports with standard manifolds. Internal pilot oil supply from port P eliminates separate feed lines, while external pilot oil return through port Y prevents back-pressure in the control chamber. A minimum pilot pressure of 4.5 bar is needed to start spool movement, and the preload valve is also set at 4.5 bar to hold the pilot gallery charged during standby.
The pilot circuit can withstand up to 210 bar, and the work ports P, A, and B are rated for 280 bar to suit high-pressure systems. Tank port T is limited to 250 bar, whereas the pilot drain ports Y and Ac are restricted to 160 bar, defining safe limits for each hydraulic path. ISO 4406 cleanliness class 20/18/15 is required to protect the precision spool from contamination. A stroke setting of 9.5 mm ensures the spool reaches its end position without over-travel. Six M12 × 60 screws that follow ISO 4762 secure the valve to the subplate, and each screw must be tightened to 100 Nm with a 10 percent tolerance to maintain sealing integrity.
Technical Specifications
Actuation Type
Electro-Hydraulic
Cleanliness Class
ISO 4406 (20/18/15)
Max Pilot Pressure
210 bar
Max Pressure (p, A, B)
280 bar
Max Pressure (t)
250 bar
Max Pressure (y, Ac)
160 bar
Min Pilot Pressure (x Internal)
4.5 bar
Mounting Screws
6x M12 x 60 (ISO 4762)
Mounting Style
Subplate Mounting
Nominal Size
NG25 ("W.H 22")
Pilot Oil Return
External (Y)
Pilot Oil Supply
Internal (P)
Porting Pattern
ISO 4401-08-08-0-05
Preload Valve Setting
4.5 bar
Screw Tightening Torque
100 Nm ±10%
Stroke Setting L4
9.5 mm
1620 Old Apex Road
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