Bosch Rexroth | 4WEH22EA7X6EG24N9ETK4QM0G24B08
4WEH22EA7X/6EG24N9ETK4QM0G24/B08
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The 4WEH22EA7X/6EG24N9ETK4QM0G24/B08 valve belongs to the WEH Directional Spool Valves series from Bosch Rexroth and is intended for automated control of hydraulic flow paths. It is built in size NG25 (W.H 22), allowing high capacity within a compact footprint. A rated flow of 450 l/min supports large actuators without excessive pressure loss, while a maximum operating pressure of 350 bar permits installation in high-pressure circuits. The body mounts to subplates machined to ISO 4401-08-08-0-05, and six M12 × 60 screws specified by ISO 4762 secure it against vibration. Electrical power reaches the solenoid through a DIN EN 175301-803 plug coded K4, simplifying replacement. The pilot stage is energized with 24 V DC and uses internal supply and return paths, so no external pilot lines are required.
Pilot circuits may operate up to 210 bar, giving ample margin for control stability. The directional element provides three spool positions to furnish forward, neutral, and reverse functions, and a spring assembly returns the spool to center when power is removed. The spool follows symbol E, which defines its porting pattern during each actuation. Position feedback is available in the rest position through a 24 V DC monitoring sensor, aiding system diagnostics. A throttle insert with a 0.8 mm orifice, identified as B08, damps pilot flow to reduce shock. The manual override on the pilot valve is concealed under a cap marked N9, allowing local operation while limiting accidental use. Hydraulic fluid must reach cleanliness class 20/18/15 per ISO 4406 to protect internal clearances and ensure long service life.
Technical Specifications
Cleanliness Class
20/18/15 (ISO 4406 (c))
Electrical Connection
DIN EN 175301-803 (K4)
Max Flow
450 l/min
Max Operating Pressure
350 bar
Max Pilot Pressure
210 bar
Mounting Interface
ISO 4401-08-08-0-05
Mounting Screws
6x M12 x 60 (ISO 4762)
Pilot Oil Flow
Internal Supply/Return (ET)
Pilot Valve Manual Override
Concealed (N9)
Pilot Valve Voltage
24 V DC
Size
NG25 (W.H 22)
Spool Monitoring
Rest Position (24 V DC)
Spool Positions
3
Spool Return
Spring
Spool Symbol
E
Throttle Insert
Ø0.8 mm (B08)
1620 Old Apex Road
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