Bosch Rexroth | H-4WEH25HD6X6EW110N9TDK23LB08
H-4WEH25HD6X/6EW110N9TDK23L/B08
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The H-4WEH25HD6X/6EW110N9TDK23L/B08 valve belongs to the WEH Directional Spool Valves series and is manufactured by Bosch Rexroth. It directs pressurized fluid in automated hydraulic circuits under electronic command. The unit uses electro-hydraulic actuation to shift a 4-way, 3-position control spool, and its nominal size is 25. Port interfaces follow the ISO 4401 pattern for manifold mounting. The spool is pressure-centered, and a throttle insert with a 0.8 mm orifice limits flow during switching. Rated operating pressure at ports P, A, and B is 350 bar. Pilot oil is supplied externally through port X, while return flow is routed internally to port T.
For rapid response the pilot stage needs 35 l/min, producing the shortest switching time. The pilot circuit endures up to 250 bar and must maintain at least 18 bar to keep the spool centered. A concealed manual override lets technicians operate the valve locally without exposing moving parts. System fluid cleanliness should meet ISO 4406 code 20/18/15 to control wear. Functional safety is supported by a mean time to dangerous failure of 100 years. With two solenoids installed and the pressure-centered spring set, the assembly weighs 19.0 kg, allowing direct mounting on machine frames.
Technical Specifications
Actuation Type
Electro-Hydraulic
Cleanliness Class
ISO 4406 20/18/15
Control Spool Return
Pressure-Centered
Manual Override
Concealed
Max Operating Pressure (p, A, B)
350 bar
Max Pilot Pressure
250 bar
Min Pilot Pressure (pressure-centered)
18 bar
Mttfd
100 years
Pilot Flow For Shortest Switching Time
35 l/min
Pilot Oil Return
Internal (T)
Pilot Oil Supply
External (X)
Porting Pattern
ISO 4401
Size (ng)
25
Throttle Insert
Ø 0.8 mm
Valve Configuration
4-way, 3-position
Weight (2 Solenoids, Pressure-centered)
19.0 kg
1620 Old Apex Road
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