Bosch Rexroth | 4WH22Y7X
4WH22Y7X/
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The 4WH22Y7X/ valve is produced by Bosch Rexroth for the WEH Directional Spool Valves series and directs hydraulic flow in automation circuits that require four valve ways arranged in two discrete spool positions. The nominal size is NG25, and the porting pattern follows ISO 4401, allowing direct mounting on standardized subplates. External pilot supply is introduced through port X, while the return leaves through port Y, keeping pilot oil separate from the main flow passages. Each actuation of the two-spool version displaces 15.28 cm³ of pilot oil, and reliable shifting starts at a pilot pressure of 11 bar; the pilot gallery may be loaded up to 210 bar without exceeding design limits.
The flow gallery handles up to 450 L/min, and working pressures on ports P, A, and B reach 280 bar for continuous duty. Port T tolerates 250 bar return pressure, while the external Y line withstands 210 bar, preventing pilot exhaust back-pressure from affecting response times. System cleanliness must stay within ISO 4406 20/18/15 to maintain spool clearances and avoid wear. Installation requires six M12 × 60 screws, each tightened to 100 N·m, to seal the interface and secure the valve body to the manifold.
Technical Specifications
Cleanliness Class
ISO 4406 20/18/15
Max Flow
450 l/min
Max Operating Pressure (p, A, B)
280 bar
Max Pilot Pressure
210 bar
Min Pilot Pressure (2-spool)
11 bar
Mounting Screws
6x M12 x 60
Mounting Torque
100 Nm
Nominal Size
NG25
Pilot Return Port
Y (external)
Pilot Supply Port
X (external)
Pilot Volume Per Switch (2-spool)
15.28 cm3
Port T Max Pressure (y External)
250 bar
Port Y Max Pressure (external)
210 bar
Porting Pattern
ISO 4401
Spool Positions
2
Valve Ways
4
1620 Old Apex Road
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