Bosch Rexroth | 4WEH22E7X6EG24N9S2DK25L
4WEH22E7X/6EG24N9S2DK25L
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The 4WEH22E7X/6EG24N9S2DK25L valve belongs to the WEH Directional Spool Valves series manufactured by Bosch Rexroth for hydraulic automation circuits. Electro-hydraulic actuation lets a pilot solenoid shift the main spool so electronic commands can reposition flow without manual effort. The unit performs a 4-way valving function, letting pressure, tank, and two work ports be connected in either operating position of the spool. Its nominal size NG25 sets the port geometry and makes the valve suitable for systems that follow the ISO 25 mm interface. Within this frame the assembly passes up to 450 l/min, providing sufficient flow for medium and large actuators. A maximum pilot pressure of 210 bar keeps the pilot stage stable under high system loads. The 6E pilot control valve uses a 24 V DC coil, and a pilot volume of 7.64 cm³ supports fast response times by limiting the oil that must be displaced.
A concealed manual override identified by the N9 code allows service personnel to shift the spool mechanically when power is unavailable. Porting follows ISO 4401-08-08-0-05, so the valve can drop onto standard sub-plates without modifications. Installation is secured with six M12 × 60 screws in accordance with ISO 4762, and each screw must be tightened to 100 Nm to maintain sealing integrity. The spool symbol E defines the flow paths used in the two positions and guides circuit designers on how the ports connect during operation. Switching time can be fine-tuned with discharge control S2, which meters pilot oil to adjust the shift speed. An MTTFd of 100 years highlights the long statistical service life of the WEH type, supporting machinery reliability targets.
Technical Specifications
Actuation
Electro-Hydraulic
Manual Override
Concealed (N9)
Max Flow (e Spool, Ng25)
450 l/min
Maximum Pilot Pressure
210 bar
Mounting Screws
6× M12×60 (ISO 4762)
Mttfd (type Weh)
100 years
Nominal Size
NG25
Pilot Control Valve
6E
Pilot Volume (spring-centered)
7.64 cm3
Porting Pattern
ISO 4401-08-08-0-05
Rated Voltage
24 V DC
Screw Tightening Torque
100 Nm
Spool Symbol
E
Switching Time Adjustment
Discharge Control (S2)
Valving Function
4-Way
1620 Old Apex Road
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