Bosch Rexroth | H-4WEH25E6X6EW110N9DAB08
H-4WEH25E6X/6EW110N9DA/B08
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The H-4WEH25E6X/6EW110N9DA/B08 is a directional spool valve from the WEH Directional Spool Valves series manufactured by Bosch Rexroth for hydraulic automation circuits. In spool configuration E the main ports conduct up to 650 l/min at 350 bar to support high-speed cylinder and motor operation. The valve is nominal size 25 and mounts on subplates that follow porting pattern ISO 4401-10-09-0-05. External pilot supply through port X and external pilot return through port Y separate control flow from working flow for stable switching. A concealed manual override coded N9 permits local actuation when solenoids are de-energized. A 0.8 mm throttle insert restricts pilot flow to damp pressure spikes.
The maximum operating pressure at ports P, A, and B is 350 bar, while port T withstands up to 250 bar during return flow. The pilot circuit tolerates 250 bar but requires at least 13 bar on spring-centered versions to shift the main spool reliably; pilot port Y and any connected accumulator line must remain below 160 bar. System oil cleanliness must meet ISO 4406 class 20/18/15 to prevent spool land wear. Installation uses six M12 × 60 screws specified by ISO 4762, each tightened to 100 Nm to seal the interface securely.
Technical Specifications
Cleanliness Class
ISO 4406 20/18/15
Manual Override
Concealed (N9)
Max Flow (spool E, 350 Bar)
650 l/min
Max Operating Pressure (p, A, B)
350 bar
Max Pilot Pressure
250 bar
Max Pressure (pilot Port Y, Ac)
160 bar
Max Pressure (port T)
250 bar
Min Pilot Pressure (spring-centered)
13 bar
Mounting Screws
6x M12 x 60 (ISO 4762)
Pilot Return
External (Y)
Pilot Supply
External (X)
Porting Pattern
ISO 4401-10-09-0-05
Screw Tightening Torque (m12)
100 Nm
Size (ng)
25
Throttle Insert Diameter
0.8 mm
1620 Old Apex Road
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