Bosch Rexroth | 4WEH22P7X6EG96NK4
4WEH22P7X/6EG96NK4
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The 4WEH22P7X/6EG96NK4 valve belongs to the WEH Directional Spool Valves series and is produced by Bosch Rexroth for automated hydraulic circuits that require electrically piloted flow direction control. The NG25 size defines the mounting envelope and flow section suitable for large industrial actuators. A P-type three-position spool delivers forward, reverse, or blocked flow paths to simplify bidirectional cylinder operation. Installation is on a subplate with the ISO 4401-08-08-0-05 porting pattern, allowing interchangeability with other NG25 components. The main ports p, a, and b withstand up to 280 bar, and the P spool passes as much as 170 l/min at that pressure to prevent throttling in high-demand cycles. Pilot oil is taken from an external X port so control pressure can remain stable even when main line pressure fluctuates. Return flow from the pilot stage exits through port y, which tolerates 210 bar, making remote tank routing practical in stacked manifolds.
The pilot stage itself accepts control pressure up to 210 bar and needs at least 10.5 bar when the spool is spring-centered to guarantee consistent shifting. A DIN EN 175301-803 (K4) electrical connector links the solenoid to standard machine wiring harnesses. NBR seals contain the working fluid and support a temperature window of –20 °C to +80 °C for common mineral oils. The valve can handle viscosities from 2.8 to 500 mm²/s, letting equipment start reliably in cold conditions yet run with low-viscosity fluids at high temperature. System cleanliness must meet ISO 4406 20/18/15 to keep the precision spool fit free of abrasive wear. A calculated MTTFd of 100 years under EN ISO 13849 shows high functional reliability for safety-related installations.
Technical Specifications
Cleanliness Class
ISO 4406 20/18/15
Electrical Connection
DIN EN 175301-803 (K4)
Hydraulic Fluid Temp Range
-20 to +80 C (NBR)
Max Flow @ 280 Bar (spool P)
170 l/min
Max Operating Pressure (p,a,b)
280 bar
Max Pilot Pressure
210 bar
Min Pilot Pressure (spring-centered)
10.5 bar
Mttfd (en Iso 13849)
100 years
Pilot Oil Supply
External (X)
Pilot Return Port Max Pressure (y)
210 bar
Porting Pattern
ISO 4401-08-08-0-05
Seal Material
NBR
Size
NG25
Spool Type
P (3-Position)
Viscosity Range
2.8 to 500 mm2/s
1620 Old Apex Road
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