Bosch Rexroth | 4WEH22HC7X6EW110NDA
4WEH22HC7X/6EW110NDA
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The 4WEH22HC7X/6EW110NDA valve belongs to the WEH Directional Spool Valves series and is manufactured by Bosch Rexroth for automated hydraulic circuits. The unit employs electro-hydraulic actuation so an external pilot converts electrical commands into spool movement. Its nominal size is NG25, and the spool has 2 discrete positions that correspond to symbol C for the required flow paths. In the main stage the spool is returned by a hydraulic bias, eliminating mechanical springs inside the body. Connection to manifolds follows the ISO 4401-08-08-0-05 porting pattern, simplifying interchange with other NG25 components. The valve withstands 350 bar at ports P, A, and B during continuous duty and allows a maximum flow of 450 l/min without exceeding permissible pressure drop.
Pilot functions rely on external lines; oil enters through port X and discharges through port Y to keep pilot flow isolated from the main channels. A 2-spool hydraulic pilot requires at least 8 bar to shift the main element and may be supplied up to 210 bar when rapid response is necessary. The internal volume of the pilot stage is 15.28 cm³, which influences response time and fluid consumption during each cycle. System cleanliness must reach ISO 4406 class 20/18/15 to avoid wear in the fine control edges. Installation uses four M12 × 60 screws specified in ISO 4762, and each screw is tightened to 100 N·m to secure the body against the manifold face.
Technical Specifications
Actuation Type
Electro-Hydraulic
Cleanliness Class
ISO 4406 20/18/15
Max Operating Pressure (p, A, B)
350 bar
Max Pilot Pressure
210 bar
Maximum Flow
450 l/min
Min Pilot Pressure (2-spool Hydraulic)
8 bar
Mounting Screw Size
M12 x 60 (ISO 4762)
Mounting Screw Torque
100 Nm
Nominal Size
NG25
Pilot Oil Return
External (Y)
Pilot Oil Supply
External (X)
Pilot Volume (2-spool)
15.28 cm3
Porting Pattern
ISO 4401-08-08-0-05
Spool Positions
2
Spool Return In Main Valve
Hydraulic
Spool Symbol
C
1620 Old Apex Road
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