Bosch Rexroth | 4WEH22HD7XOF6EW110N9EDK25LB10V-AN
4WEH22HD7X/OF6EW110N9EDK25L/B10V AN
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The 4WEH22HD7X/OF6EW110N9EDK25L/B10V AN valve belongs to the WEH Directional Spool Valves series from Bosch Rexroth and directs pressurized fluid to actuators in automated hydraulic circuits. Its nominal size of NG25 sets the passage area for the working ports, while a maximum flow capability of 450 l/min allows rapid cylinder or motor movement in large machines. The working ports P, A, and B can be loaded up to 350 bar, and the tank port T is limited to 250 bar, establishing safe operating boundaries for supply and return lines. A viscosity range of 2.8 to 500 mm²/s lets the valve function with thin start-up oils and thicker fluids at elevated temperatures. System cleanliness must stay within ISO 4406 class 20/18/15 to prevent spool jamming. The HD spool symbol defines the internal flow paths selected by the operator, and a hydraulic return mechanism (H) shifts the spool back to its neutral position after actuation.
A high-power 6E pilot control valve generates the force needed to move the main spool, drawing control oil internally from the pressure port through pilot supply code E and exhausting it externally through port Y to keep pilot back-pressure low. The pilot stage accepts pressures up to 210 bar and requires at least 8 bar to operate, setting the control window for remote solenoid or hydraulic signals. Subplate mounting lets the unit sit on a standardized manifold block, and six M12 × 60 screws secure it against dynamic loads. The ISO 4401-08-08-0-05 porting pattern aligns the pressure, service, and tank ports with common NG25 interfaces, promoting interchangeability during maintenance or system upgrades.
Technical Specifications
Cleanliness Class
20/18/15 (ISO 4406)
Max Flow (hd, X External)
450 l/min
Max Operating Pressure (p,a,b)
350 bar
Max Operating Pressure (t)
250 bar
Max Pilot Pressure
210 bar
Min Pilot Pressure
8 bar
Mounting Screws
6 x M12 x 60
Mounting Type
Subplate
Nominal Size
NG25
Pilot Control Valve
6E (High-Power)
Pilot Oil Return
External (Y)
Pilot Oil Supply
Internal (E)
Porting Pattern
ISO 4401-08-08-0-05
Spool Return
Hydraulic (H)
Spool Symbol
HD
Viscosity Range
2.8 to 500 mm²/s
1620 Old Apex Road
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