Bosch Rexroth | 4WEH22HK7XOF6WE110N9ESDA10B10
4WEH22HK7X/OF6WE110N9ESDA/10B10
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The 4WEH22HK7X/OF6WE110N9ESDA/10B10 directional spool valve is produced by Bosch Rexroth within the WEH Directional Spool Valves series, and it directs pressure and return flow to two actuator lines in hydraulic automation circuits. Its 4-way valve function supplies four service ports so pumps, cylinders, and tanks can be connected simultaneously. A nominal size of NG25 (W.H 22) establishes a passage area suited to mid-frame manifolds, while the ISO 4401-08-08-0-05 porting pattern allows the body to mount on standardized sub-plates. The unit offers two discrete positions so machines can alternate between energized and neutral states, and the internal flow paths are defined by spool symbol K. When pilot pressure is removed, a hydraulic spool return stages the element back to its rest position without the need for mechanical springs.
A maximum flow rating of 450 l/min lets the valve handle high output pumps without excessive pressure drop, and pilot control channels can be pressurized up to 210 bar to guarantee rapid shifting under load. For externally piloted circuits the spool starts to move at 8 bar, whereas an internal pilot supply only needs 4.5 bar to begin travel. Each switching event draws 15.28 cm³ of pilot oil, a volume that helps size accumulators and timing orifices in the control loop. A preload valve opens once pilot pressure reaches 4.5 bar so backflow can be relieved smoothly, and a 1.0 mm throttle insert identified as B10 meters pilot flow to dampen pressure spikes during transition.
Technical Specifications
Max Flow
450 l/min
Max Pilot Pressure
210 bar
Min Pilot Pressure (hyd End)
8 bar
Min Pilot Pressure (x Internal)
4.5 bar
Nominal Size
NG25 (W.H 22)
Number Of Positions
2
Pilot Volume Per Switch
15.28 cm3
Porting Pattern
ISO 4401-08-08-0-05
Preload Valve Cracking Pressure
4.5 bar
Spool Return
Hydraulic
Spool Symbol
K
Throttle Insert
Ø 1.0 mm (B10)
Valve Function
4-Way
1620 Old Apex Road
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