Bosch Rexroth | 4WEH22W7X6EW110N9ETDALB10
4WEH22W7X/6EW110N9ETDAL/B10
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The 4WEH22W7X/6EW110N9ETDAL/B10 directional spool valve is part of the WEH Directional Spool Valves series manufactured by Bosch Rexroth for controlling pressurized oil in automated hydraulic circuits. It is built to the NG25 nominal size, allowing connection to 25 mm porting and handling system flows suited to medium-large actuators. The W-type spool establishes the required flow paths for four-way operation, and the valve passes up to 450 l/min to match high-capacity pump outputs. Working ports A and B withstand 280 bar so the unit can be installed in high-pressure lines without external relief devices. Pilot oil is taken internally from port P, and the exhaust from the pilot stage returns internally to port T, which minimizes external tubing. The pilot stage tolerates pressures up to 210 bar and needs at least 10.5 bar to shift the spool, securing consistent actuation across varying load conditions.
Spring assemblies center the spool when pilot pressure is removed, giving a spring-centered neutral position. A concealed manual override coded N9 lets service personnel shift the spool during commissioning without disconnecting electrical pilot wiring. The valve bolts to a subplate, and the mounting face follows the ISO 4401-08-08-0-05 pattern to fit standard manifolds. Six M12 × 60 screws secure the body, and each screw is tightened to 100 Nm to maintain seal compression under pressure cycling. Circuit cleanliness must meet ISO 4406 20/18/15 to protect the spool clearances from particle wear. A 1.0 mm throttle insert designated B10 can be installed in the pilot gallery to damp switching shocks and stabilize flow transients.
Technical Specifications
Centering Type
Spring-Centered
Cleanliness Class
ISO 4406 20/18/15
Manual Override
Concealed (N9)
Maximum Flow (symbol W)
450 l/min
Maximum Operating Pressure (p, A, B)
280 bar
Maximum Pilot Pressure
210 bar
Minimum Pilot Pressure (spring-centered)
10.5 bar
Mounting Screws
6x M12 x 60
Mounting Type
Subplate
Nominal Size
NG25
Pilot Oil Return
Internal (T)
Pilot Oil Supply
Internal (P)
Porting Pattern
ISO 4401-08-08-0-05
Screw Tightening Torque (m12)
100 Nm
Spool Type
W
Throttle Insert Diameter
1.0 mm (B10)
1620 Old Apex Road
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