Bosch Rexroth | 4WEH22H7X6EW110N9DAP45
4WEH22H7X/6EW110N9DA/P4.5
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The 4WEH22H7X/6EW110N9DA/P4.5 directional spool valve is produced by Bosch Rexroth for the WEH Directional Spool Valves series, where it directs oil flow in automated hydraulic stations. Its nominal size is NG25, identified as W.H 22, which sets the flow rating and cavity dimensions. The mounting face follows the ISO 4401-08-08-0-05 porting pattern so it aligns with common subplates. Channels P, A, and B tolerate working pressures up to 280 bar, while the tank return at port T can handle 250 bar. A separate drain at port Y is limited to 160 bar to safeguard the pilot stage. System fluid must meet cleanliness class ISO 4406 20/18/15 to maintain reliable spool movement.
The pilot circuit accepts pressures up to 210 bar and still actuates at a minimum of 8 bar on two-spool hydraulic ends, allowing operation from low-pressure control lines. An internal preload valve cracks at 4.5 bar to start pilot flow before the main spool shifts fully. Installation requires six M12 × 60 screws specified by ISO 4762, and each screw is tightened to 100 Nm to secure the valve body. The mean time to dangerous failure for this WEH type is 100 years, providing long service life in production machinery.
Technical Specifications
Cleanliness Class
ISO 4406 20/18/15
Max Pilot Pressure
210 bar
Max Pressure (p, A, B)
280 bar
Max Pressure Port T
250 bar
Max Pressure Port Y (ac)
160 bar
Min Pilot Pressure (2-spool, Hyd End)
8 bar
Mounting Screws
6x M12 x 60 (ISO 4762)
Mttfd (type Weh)
100 years
Nominal Size
NG25 (W.H 22)
Porting Pattern
ISO 4401-08-08-0-05
Preload Valve Cracking Pressure
4.5 bar
Tightening Torque (m12)
100 Nm
1620 Old Apex Road
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