Bosch Rexroth | H-4WEH25E6X6EW110N9DAV
H-4WEH25E6X/6EW110N9DA/V
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The H-4WEH25E6X/6EW110N9DA/V directional spool valve is produced by Bosch Rexroth for the WEH Directional Spool Valves series. As a remotely piloted valve used for hydraulic automation, it directs flow between work ports when the pilot signal shifts the spool. The unit is built around the NG25 size, so it mounts on manifolds that follow the ISO 4401-08-08-0-05 porting pattern. A three-position E-type spool sits inside the body and returns to center by a spring-centered mechanism when pilot pressure is removed. External pilot oil enters through port X and returns through port Y, which separates control oil from the main circuit. The design needs at least 13 bar pilot pressure to overcome the centering springs, while the pilot stage can tolerate up to 250 bar. Working ports P, A, and B handle operating pressures up to 350 bar, enabling the valve to control high-pressure actuators without fatigue.
Flow capability and fluid limits define suitable service conditions. With symbol E selected, the valve passes as much as 650 l/min at 350 bar, supporting large cylinder or motor movements. This capacity applies when the spool is fully shifted. Hydraulic fluids may have viscosities from 2.8 to 500 mm²/s, so both thin and heavy oils can be used without loss of function. The permitted fluid temperature spans −15 to +80 °C, while ambient temperature around the housing may range from −15 to +50 °C, ensuring stable performance in standard industrial environments. Contamination must not exceed ISO 4406 class 20/18/15 to protect metering edges from wear. Port T is rated for back pressure up to 250 bar, which allows the return line to share manifolds carrying moderate counter pressure. The complete assembly weighs 19.0 kg, a mass that should be considered for manifold support and service handling.
Technical Specifications
Ambient Temperature (fkm)
-15 to +50 °C
Centering Type
Spring-Centered
Cleanliness Class
ISO 4406 20/18/15
Hydraulic Fluid Temp (fkm)
-15 to +80 °C
Max Flow At 350 Bar (symbol E)
650 l/min
Max Operating Pressure (p/a/b)
350 bar
Max Pilot Pressure
250 bar
Max Pressure Port T
250 bar
Min Pilot Pressure (spring-centered)
13 bar
Nominal Size
NG25 (W.H 25)
Pilot Oil Return
External (Y)
Pilot Oil Supply
External (X)
Porting Pattern
ISO 4401-08-08-0-05
Spool Symbol
E (3-Position)
Viscosity Range
2.8 to 500 mm²/s
Weight
19.0 kg
1620 Old Apex Road
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