Bosch Rexroth | 4WH22HD7X
4WH22HD7X/
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The 4WH22HD7X/ valve is manufactured by Bosch Rexroth for the WEH Directional Spool Valves series. It directs hydraulic flow in automated circuits and is supplied in size NG25 to fit standard manifold interfaces. The porting pattern follows ISO 4401-08-08-0-05, allowing quick integration with subplates designed for this layout. Two spool positions provide straightforward switching between flow paths, while an external X pilot oil supply enables independent actuation from the main line. Pilot oil is returned through the Y port, keeping tank lines separate from control pressure. Each actuation moves 15.28 cm³ of pilot fluid, and the valve passes up to 450 l/min through the service ports when fully opened. Installation uses six M12 × 60 bolts to ISO 4762 grade 10.9, which must be tightened to 100 Nm with a tolerance of ±10 % to secure the body against the manifold.
The pressure limits are matched to high-duty power units: ports P, A, and B withstand 280 bar during operation, the T port handles 250 bar, and the Y pilot return tolerates 210 bar. The pilot circuit may be driven up to 210 bar yet still functions at a minimum of 8 bar at the hydraulic end, giving a wide control range. System cleanliness must be maintained at class 20/18/15 per ISO 4406 so the spool and seats remain free of abrasion. A mean time to dangerous failure of 150 years under EN ISO 13849 supports safety-related uses that demand extended reliability. Together these characteristics define a valve suitable for continuous service where high flow, tight pressure control, and external piloting are required.
Technical Specifications
Bolt Tightening Torque
100 Nm ±10%
Cleanliness Class (iso 4406)
20/18/15
Max Flow (hd)
450 l/min
Max Operating Pressure (p, A, B)
280 bar
Max Pilot Pressure
210 bar
Max Pressure, Port T
250 bar
Max Pressure, Port Y
210 bar
Min Pilot Pressure (hydraulic End)
8 bar
Mounting Bolts
6x M12 x 60 (ISO 4762, 10.9)
Mttfd (en Iso 13849)
150 years
Pilot Oil Return
External (Y)
Pilot Oil Supply
External (X)
Pilot Volume Per Switching
15.28 cm3
Porting Pattern
ISO 4401-08-08-0-05
Size (ng)
NG25
Spool Positions
2
1620 Old Apex Road
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