Bosch Rexroth | 4WH22E7X
4WH22E7X/
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The 4WH22E7X/ valve is manufactured by Bosch Rexroth for the WEH Directional Spool Valves series and routes hydraulic power in automated machinery. Hydraulic actuation lets the spool shift by pilot pressure without electrical components. Its 4-way layout offers one pressure, one tank, and two work ports so cylinders can move in both directions. Three spool positions present neutral, extend, and retract states to simplify motion sequencing. A nominal size of NG25 supports moderate flow rates while limiting pressure loss through the body. The ISO 4401 porting pattern aligns the valve with common subplates for quick installation. External pilot oil enters through port X, permitting control even when the main line is depressurized. Pilot oil drains through port Y to prevent back-pressure from affecting the spool. Maximum operating pressure of 280 bar at ports P, A, and B equips the unit for high-force hydraulic circuits.
The valve body weighs 10.5 kg, allowing one person to place it onto a manifold during assembly. Main flow is limited to 450 l/min when the pilot supply is external, protecting actuators from excessive speed. Port T withstands up to 250 bar so back-pressure in regenerative systems remains within safe limits. Pilot circuits may reach 210 bar, ensuring fast spool movement under load, while a spring-centered version needs at least 10.5 bar pilot pressure to overcome the return springs. Hydraulic oil cleanliness must meet ISO 4406 class 20/18/15 to reduce wear between the spool and bore. Six M12 × 60 socket head screws per ISO 4762 secure the housing to the subplate and maintain seal compression. A mean time to dangerous failure of 150 years supports long service life in safety-related installations.
Technical Specifications
Actuation
Hydraulic
Cleanliness Class
ISO 4406 20/18/15
Flow Limit (e, X External)
450 l/min
Max Operating Pressure (p/a/b)
280 bar
Max Operating Pressure (t)
250 bar
Max Pilot Pressure
210 bar
Min Pilot Pressure (spring-centered)
10.5 bar
Mounting Screws
6x M12 x 60 (ISO 4762)
Mttfd (type Wh)
150 years
Nominal Size
NG25
Pilot Oil Return
External (Y)
Pilot Oil Supply
External (X)
Porting Pattern
ISO 4401
Spool Positions
3
Way Configuration
4-Way
Weight (type Wh)
10.5 kg
1620 Old Apex Road
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