Bosch Rexroth | H-4WH22G7XV
H-4WH22G7X/V
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The H-4WH22G7X/V directional spool valve is produced by Bosch Rexroth within the WEH Directional Spool Valves series and is intended to route hydraulic flow in automated circuits. It uses hydraulic actuation to shift a 4/3-way spool, allowing operators to alternate flow paths or block ports as required by machine sequences. The valve is built in nominal size NG25 so internal passages can carry high volumes without excessive pressure loss. With symbol G measured at 350 bar, the permissible flow reaches 180 l/min, supporting medium-to-large actuators. Working ports P, A, and B withstand continuous pressures up to 350 bar, while the pilot stage accepts a maximum of 210 bar. A spring-centered spool needs at least 10.5 bar pilot pressure to move from its neutral position, and the pilot oil is supplied externally at port X to keep control circuits independent of main line fluctuations.
A subplate mounting interface secures the valve to manifolds and aligns the ISO 4401-08-08-0-05 porting pattern for straightforward interchangeability. Pilot oil returns through an external Y port, and the tank line T endures pressures up to 250 bar, whereas the external return line can handle 210 bar. FKM seals are fitted to tolerate synthetic or high-temperature fluids without leakage. The required fluid cleanliness is class 20/18/15 per ISO 4406 to maintain spool precision and prevent premature wear. An MTTFd of 150 years indicates a long statistical service life in safety-related systems. These characteristics, combined with the NG25 flow paths and hydraulic actuation detailed earlier, make the H-4WH22G7X/V suitable for automated presses, molding equipment, and other installations where dependable directional control and standardized mounting are essential.
Technical Specifications
Actuation Type
Hydraulic
Cleanliness Class (iso 4406)
20/18/15
Flow Limit (symbol G, 350 Bar)
180 l/min
Max Pressure (port T)
250 bar
Max Pressure (port Y, External)
210 bar
Maximum Pilot Pressure
210 bar
Maximum Pressure (p, A, B)
350 bar
Minimum Pilot Pressure (3-pos, Spring)
10.5 bar
Mounting Type
Subplate
Mttfd (en Iso 13849)
150 years
Nominal Size
NG25
Pilot Oil Return
External (Y)
Pilot Oil Supply
External (X)
Porting Pattern
ISO 4401-08-08-0-05
Seal Material
FKM
Way Function
4/3-Way
1620 Old Apex Road
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