Bosch Rexroth | 4WEH22H7X6EG24N9DA
4WEH22H7X/6EG24N9DA
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The 4WEH22H7X/6EG24N9DA valve is part of the WEH Directional Spool Valves series manufactured by Bosch Rexroth for automated hydraulic systems where reliable flow control is required. Its electro-hydraulic actuation lets an electrical command shift the main spool with hydraulic force, and a 24 V DC coil powers the pilot solenoid so it can tie into common control voltage rails. A 6E high-power pilot valve produces the shifting force, while the main spool is driven back to center by hydraulic return pressure instead of mechanical springs. The unit conforms to the ISO 4401-08-08-0-05 porting pattern, and the NG25 (W.H 22) size accommodates substantial flow in medium-frame manifolds. Pilot oil is supplied through external port X and returned through external port Y, isolating pilot functions from tank pressure. A concealed manual override allows local operation during maintenance without exposing internal parts to debris.
The primary flow paths p, a, and b withstand operating pressures up to 280 bar, making the valve suitable for high-pressure supply circuits. Pilot passages are limited to 210 bar to protect the control stage from over-loading. Return port T tolerates 250 bar so the valve can discharge into lines with elevated back-pressure, and the external Y port matches the 210 bar pilot rating for consistent design margins. NBR seals contain standard hydraulic fluids and maintain integrity under the stated pressures and temperatures. The four-way configuration provides separate pressure, return, and two service lines, enabling bidirectional actuation of cylinders or hydraulic motors without additional switching elements.
Technical Specifications
Actuation
Electro-Hydraulic
Coil Voltage
24 V DC
Manual Override
Concealed
Max Operating Pressure (p,a,b)
280 bar
Max Pilot Pressure
210 bar
Max Pressure Port T
250 bar
Max Pressure Port Y (external)
210 bar (DC)
Pilot Oil Return
External (Y)
Pilot Oil Supply
External (X)
Pilot Valve Type
6E High-Power
Porting Pattern
ISO 4401-08-08-0-05
Seal Material
NBR
Size
NG25 (W.H 22)
Spool Return (main Valve)
Hydraulic
Way Configuration
4-Way
1620 Old Apex Road
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