Bosch Rexroth | H-4WEH25E6X6EG12N9K4
H-4WEH25E6X/6EG12N9K4
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The H-4WEH25E6X/6EG12N9K4 valve is built by Bosch Rexroth for the WEH Directional Spool Valves series and is intended to route pressurized oil in automated hydraulic machinery. It uses electro-hydraulic actuation so a pilot stage shifts the main spool with force that exceeds what direct solenoids can provide. The unit has a 4-way, 3-position layout, and spool symbol E establishes the neutral and working flow paths required for bidirectional cylinder control. Nominal size NG25 fixes the interface dimensions while the ISO 4401-08-08-0-05 porting pattern aligns the body with standard subplates. A 6E high-power pilot control valve delivers rapid spool movement once the minimum pilot pressure of 13 bar is reached. For on-site intervention, a concealed N9 manual override lets technicians reposition the spool without energizing the solenoids. The electrical connection follows DIN EN 175301-803 K4, providing a detachable plug for coil wiring, and the assembled valve with two solenoids and spring centering weighs 19.0 kg.
The hydraulic envelope supports a maximum operating pressure of 350 bar on ports P, A, and B, allowing the valve to handle high-force actuators without seat erosion. Pilot supply lines may be pressurized up to 250 bar, and the same 250 bar limit applies to port T, ensuring safe tank return under back-pressure conditions. When port Y is piped externally, it must remain below 210 bar to protect the drain gallery. With symbol E at 350 bar the cartridge passes 650 l/min, so large flow demands are met without parallel valving. System oil must stay within ISO 4406 class 20/18/15 to preserve clearances and prevent spool sticking caused by contamination.
Technical Specifications
Actuation Type
Electro-Hydraulic
Electrical Connection
DIN EN 175301-803 (K4)
Fluid Cleanliness Class
ISO 4406 20/18/15
Manual Override
Concealed (N9)
Max Flow (symbol E, 350 Bar)
650 l/min
Max Operating Pressure (p, A, B)
350 bar
Max Pilot Pressure
250 bar
Max Port T Pressure
250 bar
Max Port Y Pressure (external, Dc)
210 bar
Min Pilot Pressure (3-pos Spring-centered)
13 bar
Nominal Size
NG25
Pilot Control Valve
6E High-Power
Porting Pattern
ISO 4401-08-08-0-05
Spool Symbol
E
Way Configuration
4-Way, 3-Position
Weight (2 Solenoids, Spring-centered)
19.0 kg
1620 Old Apex Road
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