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The 4WEH22J7X/6EG96N9S2K4 directional spool valve is produced by Bosch Rexroth within the WEH Directional Spool Valves series and directs hydraulic flow in automated systems. With nominal size NG25, it handles up to 450 l/min through symbol J while main ports P, A, and B tolerate 280 bar during continuous duty. Subplate mounting on an ISO 4401-08-08-0-05 interface allows quick replacement without pipe work. Pilot oil is supplied internally from port P and returned externally through port Y, so designers can isolate pilot and tank circuits. Spring-centered operation needs at least 10.5 bar pilot pressure and moves 7.64 cm³ of pilot oil each cycle. ISO 4406 cleanliness class 20/18/15 is required to keep spool clearances free of abrasive particles.
Pilot circuitry can be pressurized to 210 bar for reliable shifting; if the return stays external, port Y may see up to 250 bar, whereas an internal DC return must remain at or below 210 bar. The valve is secured with four M12 × 60 screws to ISO 4762, each tightened to 100 Nm to maintain seal integrity on the subplate. A mean time to dangerous failure of 100 years supports long-term service in safety-related machines. These pressure limits, fastening details, and reliability figures assist engineers when integrating the 4WEH22J7X/6EG96N9S2K4 into high-duty hydraulic automation lines.
Cleanliness Class
ISO 4406 20/18/15
Max Flow (symbol J)
450 l/min
Max Operating Pressure (p, A, B)
280 bar
Max Pilot Pressure
210 bar
Max Pressure (y External)
250 bar
Max Pressure (y Internal, Dc)
210 bar
Min Pilot Pressure (spring-centered)
10.5 bar
Mounting Screw Size
M12 × 60 (ISO 4762)
Mounting Screw Torque
100 Nm
Mounting Type
Subplate Mounting
Mttfd Value
100 years
Nominal Size
NG25
Pilot Oil Return
External (Y)
Pilot Oil Supply
Internal (from P)
Pilot Volume (spring-centered)
7.64 cm3
Porting Pattern
ISO 4401-08-08-0-05
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