Bosch Rexroth | H-4WEH25G6X6EG24N9K4B10D3
H-4WEH25G6X/6EG24N9K4/B10D3
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The H-4WEH25G6X/6EG24N9K4/B10D3 valve belongs to the WEH Directional Spool Valves series from Bosch Rexroth and directs pressurized fluid to actuators in automated hydraulic circuits. It is built with a nominal size of 25, a dimension that determines flow capacity and matches size 25 mounting plates. The porting pattern follows ISO 4401-08-08-0-05 so the housing seats directly on standardized subplates. Ports P, A, and B accept up to 350 bar, enabling use in high-pressure work circuits, while port T is rated for 250 bar to protect the return line and port Y carries a 210 bar limit for the external drain. Pilot supply is taken from an external X connection and returned through an external Y connection, allowing separate pilot pressure control. A 1.0 mm throttle insert in the pilot gallery meters flow to adjust shifting speed, and the permitted viscosity range of 2.8 to 500 mm²/s covers most hydraulic oils from cold start to full operating temperature.
The valve can be installed in environments from −20 to +50 °C, and it tolerates hydraulic fluid temperatures between −20 and +80 °C to accommodate seasonal changes and internal heating. Coil actuation is powered from a 24 V DC supply, and the DIN EN 175301-803 K4 connector simplifies electrical hookup in control cabinets. System cleanliness must reach ISO 4406 20/18/15 to prevent spool sticking and premature wear. When the integrated pressure-reducing stage is used, the secondary side is limited to 45 bar to protect pilot components. Mechanical fastening uses M12 × 60 screws matched to the size-25 footprint, and each screw must be tightened to 100 Nm so the body remains sealed against the subplate under dynamic pressure cycles.
Technical Specifications
Ambient Temperature Range (nbr)
–20 to +50 °C
Cleanliness Class
ISO 4406 (c) 20/18/15
Electrical Connection
DIN EN 175301-803 (K4)
Hydraulic Fluid Temp Range (nbr)
–20 to +80 °C
Max Operating Pressure (p, A, B)
350 bar
Mounting Screws (size 25)
M12 x 60
Nominal Size (ng)
25
Pilot Oil Supply/return
X External, Y External
Pilot Throttle Insert Diameter
1.0 mm
Port T Max Pressure
250 bar
Port Y Max Pressure (external, Dc)
210 bar
Porting Pattern
ISO 4401-08-08-0-05
Pressure Reducing Valve Secondary Pressure
45 bar
Screw Tightening Torque (size 25)
100 Nm
Supply Voltage
24 V DC
Viscosity Range
2.8 to 500 mm²/s
1620 Old Apex Road
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