Bosch Rexroth | 4WH22HD7XV
4WH22HD7X/V
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The 4WH22HD7X/V directional spool valve belongs to the WEH Directional Spool Valves series and is produced by Bosch Rexroth. Designed for hydraulic automation, it directs flow between supply and actuator ports within manifold systems. The valve uses hydraulic actuation, so no electrical solenoids are required. A nominal size of NG25 supports high-flow circuits, while the 4-way channel arrangement provides separate pressure, tank, and two work lines. Two spool positions permit switching between an active and a neutral path. The porting pattern follows ISO 4401-08-08-0-05, enabling interchange with standard subplates. Maximum flow reaches 450 l/min, allowing rapid cylinder or motor operation. Working ports P, A, and B tolerate up to 280 bar, which matches mid-pressure industrial machines. Pilot operation begins at 8 bar, ensuring reliable shifting even in low-pressure pilot lines.
Pilot supply may rise to 210 bar without damaging the control stage, and port Y is rated for the same 210 bar to return pilot oil safely. The tank port withstands 250 bar, supporting circuits that experience back-pressure during dynamic braking. Contamination limits are set to cleanliness class 20/18/15 per ISO 4406, so particle filtration is necessary for long service life. FKM seals resist high-temperature hydraulic fluids and maintain leak-tight operation. Six M12 × 60 mounting screws secure the housing to the manifold, and each screw requires 100 Nm of tightening torque to prevent loss under pulsating loads. The valve exhibits an MTTFd of 150 years, reflecting a low probability of dangerous failure in control functions. These limits and construction details define safe installation and dependable switching performance in automated hydraulic equipment.
Technical Specifications
Actuation Type
Hydraulic
Cleanliness Class
20/18/15 (ISO 4406)
Max Flow
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
8 bar
Mounting Screws
M12 x 60 (6 pcs)
Mttfd (type Wh)
150 years
Nominal Size
NG25 (W.H 22)
Porting Pattern
ISO 4401-08-08-0-05
Screw Tightening Torque
100 Nm
Seal Material
FKM
Spool Positions
2
Way Configuration
4-Way
1620 Old Apex Road
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