Bosch Rexroth | 4WH22D7X
4WH22D7X/
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The 4WH22D7X/ directional spool valve is produced by Bosch Rexroth and belongs to the WEH Directional Spool Valves series for switching hydraulic flow paths in automated machines. Its nominal size is NG25, establishing the mating surface dimensions for standard subplates, and the ISO 4401-08-08-0-05 porting pattern ensures interchangeability with common manifolds. Six service ports labeled P, A, B, T, X, and Y organize pressure supply, actuator lines, return, and pilot connections. External pilot oil supply through ports X and Y separates control pressure from main flow for stable actuation, while a pilot volume of 15.28 cm³ in the two-spool version defines the oil required per shift. Maximum operating pressure on ports P, A, and B reaches 280 bar, and the pilot stage accepts up to 210 bar, enabling high-pressure work circuits. A spring-end minimum pilot pressure of 11 bar guarantees spool return when the control signal is removed.
The valve needs hydraulic fluid cleanliness of class 20/18/15 per ISO 4406 to protect the precision metering edges. Port T tolerates up to 250 bar so the unit can discharge into back-pressurized returns. Subplate mounting lets the body be removed without disturbing hard piping, and the interface is clamped with six M12 × 60 screws defined by ISO 4762. These screws are tightened to 100 Nm to maintain gasket compression under full load. Functional safety is supported by an MTTFd of 150 years in accordance with EN ISO 13849. The assembly weighs 10.5 kg, which should be considered in bracket design and service handling.
Technical Specifications
Fluid Cleanliness
Class 20/18/15 (ISO 4406)
Max Operating Pressure (p, A, B)
280 bar
Max Pilot Pressure
210 bar
Max Pressure Port T
250 bar
Min Pilot Pressure (spring End)
11 bar
Mounting Screw Torque
100 Nm
Mounting Screws
6x M12 x 60 (ISO 4762)
Mounting Type
Subplate Mounting
Mttfd
150 years (EN ISO 13849)
Nominal Size
NG25
Pilot Oil Supply
External (X, Y)
Pilot Volume (2-spool)
15.28 cm3
Porting Pattern
ISO 4401-08-08-0-05
Ports
P, A, B, T, X, Y
Weight (type Wh)
10.5 kg
1620 Old Apex Road
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