Bosch Rexroth | 4WEH22HD7XOF6EW110N9TK4
4WEH22HD7X/OF6EW110N9TK4
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The 4WEH22HD7X/OF6EW110N9TK4 directional spool valve is produced by Bosch Rexroth within the WEH Directional Spool Valves series. It directs hydraulic flow for automation tasks and matches NG25 interface dimensions. The valve handles up to 450 l/min while sustaining 350 bar in P, A, and B ports, and it permits 250 bar on the tank port. Pilot oil is supplied externally through connection X and returned internally through port T. A hydraulic mechanism returns the main spool to its neutral position once pilot pressure is removed. Fluid cleanliness must reach ISO 4406 class 20/18/15 to maintain service life. Electrical actuation is provided via a DIN EN 175301-803 K4 connector.
The pilot stage tolerates 210 bar on the supply line and 160 bar on the return line, with full spool travel achieved when pilot pressure reaches at least 8 bar. Mounting requires M12 × 60 screws tightened to 100 Nm to secure the body to the manifold. The valve’s mean time to dangerous failure is 100 years, supporting continuous industrial duty. These characteristics make the unit suited for high-duty hydraulic circuits that demand reliable directional control at elevated pressures.
Technical Specifications
Cleanliness Class (iso 4406 (c))
20/18/15
Electrical Connection
DIN EN 175301-803 (K4)
Main Spool Return
Hydraulic
Max Flow
450 l/min
Max Operating Pressure (p, A, B)
350 bar
Max Pilot Pressure
210 bar
Max Pilot Return Pressure (y, Internal, Ac)
160 bar
Max Pressure (t Port)
250 bar
Min Pilot Pressure (hydraulic End Position)
8 bar
Mounting Screw Size
M12 x 60
Mounting Screw Torque
100 Nm
Mttfd (type Weh)
100 years
Pilot Oil Return
T Internal
Pilot Oil Supply
X External
Size (nominal)
NG25
1620 Old Apex Road
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