Bosch Rexroth | 4WEH22EB7X6EG24N9K4
4WEH22EB7X/6EG24N9K4
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The 4WEH22EB7X/6EG24N9K4 directional spool valve is manufactured by Bosch Rexroth under the WEH Directional Spool Valves series for remote control of hydraulic actuators. Its nominal size of 25 sets the flow cross-section suitable for medium to high power circuits. A maximum flow capacity of 450 l/min accommodates rapid cylinder or motor movement without excessive pressure drop. The main pressure ports P, A, and B withstand up to 280 bar, while the tank port t is limited to 250 bar to protect the return line. Pilot supply may reach 210 bar to ensure reliable spool shifting, and the spring-centered design begins to respond at 10.5 bar, giving predictable actuation. The valve follows the ISO 4401-08-08-0-05 porting pattern, and subplate mounting simplifies replacement without disturbing hard plumbing.
Fluid cleanliness must meet ISO 4406 (c) 20/18/15 so the spool and sealing edges remain free of abrasive wear. Electrical energization is provided through a DIN EN 175301-803 K4 connector, offering a standardized interface for the solenoid coil. The external drain port Y tolerates up to 210 bar, allowing flexible routing of pilot oil in installations with back-pressure. Correct installation requires tightening the six M12 × 60 ISO 4762 mounting screws to 100 Nm so the housing seats evenly. The mating surface flatness must stay within 0.01 mm per 100 mm and the roughness may not exceed Rzmax 4 µm; these limits maintain sealing integrity between valve and subplate. An MTTFd of 100 years indicates a very low probability of dangerous failure, supporting machine designs that target high safety performance levels.
Technical Specifications
Cleanliness Class
ISO 4406 (c) 20/18/15
Electrical Connection
DIN EN 175301-803 (K4)
Max Flow (symbol E, X External)
450 l/min
Max Operating Pressure (p, A, B)
280 bar
Max Operating Pressure (t)
250 bar
Max Pilot Pressure
210 bar
Max Pressure (port Y External)
210 bar
Min Pilot Pressure (spring-centered)
10.5 bar
Mounting Screw Torque
100 Nm
Mounting Screws
6 × M12 × 60 (ISO 4762)
Mounting Surface Flatness
0.01/100 mm
Mounting Surface Roughness
Rzmax 4 µm
Mounting Type
Subplate Mounting
Mttfd (en Iso 13849)
100 years
Nominal Size
25
Porting Pattern
ISO 4401-08-08-0-05
1620 Old Apex Road
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