Bosch Rexroth | H-4WEH25L6X6EW110N9K4
H-4WEH25L6X/6EW110N9K4
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The H-4WEH25L6X/6EW110N9K4 valve is manufactured by Bosch Rexroth for the WEH Directional Spool Valves series and is intended to route hydraulic flow in automated machinery. It has a 4-way configuration and a nominal size of NG25, allowing it to handle substantial flow in manifold systems. The spool marked with symbol L sets the flow paths for each position, and the porting pattern ISO 4401-08-08-0-05 aligns the body with standard subplates. Pilot oil is fed externally through port X and discharged through port Y so that pilot pressure is isolated from main line variations. A pilot flow of 35 l/min is required for the shortest switching time, with a minimum pilot pressure of 13 bar to shift the spring-centered three-position spool; the pilot circuit must stay below 250 bar to protect the control stage.
Main pressure ports P, A, and B tolerate up to 350 bar, while port T is limited to 250 bar to prevent tank return damage. NBR seals contain the fluid under these ratings, and system cleanliness must be maintained at class 20/18/15 per ISO 4406 (c) to avoid wear and sticking. Electrical actuation uses a DIN EN 175301-803 K4 connector, and a concealed N9 manual override permits local operation during setup or power loss. The valve is secured with six M12 × 60 screws that follow ISO 4762, ensuring stable mounting against hydraulic forces. These features combine to deliver reliable directional control in high-pressure automation circuits.
Technical Specifications
Contamination Class
20/18/15 (ISO 4406 (c))
Electrical Connector
DIN EN 175301-803 (K4)
Manual Override
Concealed (N9)
Max Operating Pressure (p/a/b)
350 bar
Max Pilot Pressure
250 bar
Max Pressure Port T
250 bar
Min Pilot Pressure (3-pos, Spring-cent.)
13 bar
Mounting Screws
6x M12 x 60 (ISO 4762)
Nominal Size
25 (NG25)
Pilot Flow For Shortest Switching Time
35 l/min
Pilot Oil Return
External (Y)
Pilot Oil Supply
External (X)
Porting Pattern
ISO 4401-08-08-0-05
Seal Material
NBR
Spool Symbol
L
Way Configuration
4-Way
1620 Old Apex Road
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