Bosch Rexroth | 4WEH22H7X6EG12N9TK4
4WEH22H7X/6EG12N9TK4
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The 4WEH22H7X/6EG12N9TK4 directional spool valve is produced by Bosch Rexroth for the WEH Directional Spool Valves series and is used to route pressure flow in automated hydraulic circuits. With a nominal size of NG25, the valve handles medium-capacity flow common to industrial machinery. Its four-way layout provides separate pressure, tank, and two work ports so double-acting actuators can extend and retract. A maximum operating pressure of 280 bar on ports P, A, and B lets the unit function in high-pressure systems. Hydraulic fluid must meet cleanliness class ISO 4406 20/18/15 to keep internal wear low. Pilot oil enters externally through port X, giving designers freedom to choose a stable control source. Return flow leaves internally through port Y, which cuts down on external hoses. The pilot circuit accepts up to 210 bar, defining the upper limit for control pressure.
The control spool is returned to center hydraulically, removing the need for mechanical springs and maintaining repeatable switching. A concealed manual override coded N9 allows local operation during setup or power loss while guarding against inadvertent use. Solenoid leads connect with a DIN EN 175301-803 form K4 plug so standard molded cables can be installed quickly. Subplate mounting lets technicians replace the valve without disturbing hard piping, and the port interface follows ISO 4401-08-08-0-05 for interchangeability with other NG25 devices. Secure installation uses six M12 × 60 screws to ISO 4762, each tightened to 100 Nm to maintain gasket compression. The pilot return passage tolerates 210 bar, so back-pressure in the tank line will not upset spool centering. An MTTFd of 100 years supports long service life calculations in safety-related machine designs.
Technical Specifications
Cleanliness Class
ISO 4406 20/18/15
Control Spool Return
Hydraulic
Electrical Connection
DIN EN 175301-803 (K4)
Manual Override
Concealed (N9)
Max Operating Pressure (p,a,b)
280 bar
Max Pilot Return Pressure (y)
210 bar
Maximum Pilot Pressure
210 bar
Mounting Screws
6x M12 x 60 (ISO 4762)
Mounting Type
Subplate Mounting
Mttfd (type Weh)
100 years
Nominal Size
NG25
Number Of Ways
4-Way
Pilot Oil Return
Internal (Y)
Pilot Oil Supply
External (X)
Porting Pattern
ISO 4401-08-08-0-05
Screw Tightening Torque
100 Nm
1620 Old Apex Road
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