Bosch Rexroth | H-4WEH25G6X6EG24N9S2K4
H-4WEH25G6X/6EG24N9S2K4
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The H-4WEH25G6X/6EG24N9S2K4 is produced by Bosch Rexroth within the WEH Directional Spool Valves series and directs hydraulic flow in automated machinery. Actuation is electro-hydraulic, so an internal pilot stage shifts the main spool with pressurized oil commanded by a solenoid. The nominal size of 25 (NG25) supports the flow rates expected in large circuits. Spool symbol G identifies the flow paths that are opened in each energized position, while a spring-centered return forces the spool back to neutral when power is removed. A 24 V DC coil energizes the solenoid, and the DIN EN 175301-803 (K4) connector provides quick electrical hookup. A 6E pilot valve is fitted to control pilot oil to the end faces of the spool. The S2 switching time adjustment lets the user trim actuation speed to match system dynamics. A concealed N9 manual override permits local shifting during commissioning or power loss.
The porting pattern follows ISO 4401-10-09-0-05, allowing the valve to mount on standard sub-plates without re-machining. External pilot oil supply and external pilot oil return keep pilot flow independent of main line pressure, which helps maintain consistent actuation. The valve withstands a maximum operating pressure of 350 bar on the main ports, and the pilot stage tolerates up to 250 bar. Port Y, used for external drain, is limited to 210 bar to protect the return gallery. Fluid cleanliness must meet class 20/18/15 per ISO 4406 to prevent spool sticking and seat wear. Switching time can be tuned further by adjusting the S2 orifice, enabling optimized response after installation. Together these characteristics allow the valve to control direction in high-pressure, high-flow hydraulic systems with stable pilot performance.
Technical Specifications
Actuation
Electro-Hydraulic
Cleanliness Class
20/18/15 (ISO 4406)
Coil Voltage
24 V DC
Electrical Connection
DIN EN 175301-803 (K4)
Manual Override
Concealed (N9)
Max Pressure Port Y (external, Dc)
210 bar
Maximum Operating Pressure
350 bar
Maximum Pilot Pressure
250 bar
Nominal Size
25 (NG25)
Pilot Oil Return
External
Pilot Oil Supply
External
Pilot Valve Type
6E
Porting Pattern
ISO 4401-10-09-0-05
Spool Return
Spring-Centered
Spool Symbol
G
Switching Time Adjustment
S2
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