Bosch Rexroth | H-4WEH25HH6X6EG12N9DA
H-4WEH25HH6X/6EG12N9DA
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The H-4WEH25HH6X/6EG12N9DA valve is produced by Bosch Rexroth within the WEH Directional Spool Valves series. It shifts hydraulic flow between actuator ports in automated machines where external pilot control is available. The 4-way flow path supports bidirectional cylinder or motor circuits, and spool symbol H defines the overlap geometry for balanced transition between positions. A nominal size 25 passage area enables the valve to handle 360 l/min at 350 bar so high-power actuators can move at design speed. External pilot supply through port X isolates control pressure from the main lines, while external pilot return through port Y keeps tank backpressure from influencing spool movement. Because the spool is recentred hydraulically, response remains consistent even in large-diameter assemblies.
Pilot pressure requirements range from 18 bar for reliable centering up to 250 bar as a maximum to protect the control stage from overload. Installation uses six M12 × 60 bolts tightened to 100 Nm so the body stays leak-free under full system load. The single-solenoid version weighs 17.6 kg, which must be supported by the subplate or manifold. A concealed N9 manual override permits local actuation during commissioning without exposing moving parts to accidental contact. Fluid cleanliness should meet ISO 4406 class 20/18/15 so the precision-ground spool remains free of abrasion. With a mean time to dangerous failure of 100 years, the valve supports long service intervals in safety-related circuits.
Technical Specifications
Cleanliness Class
ISO 4406 20/18/15
Main Spool Return
Hydraulic
Manual Override
Concealed (N9)
Max Flow (symbol H, 350 Bar)
360 l/min
Max Operating Pressure
350 bar
Max Pilot Pressure
250 bar
Min Pilot Pressure (pressure-centered)
18 bar
Mounting Screws
6x M12 x 60
Mounting Torque (m12)
100 Nm
Mttfd (type Weh)
100 years
Nominal Size (ng)
25 (W.H 25)
Pilot Oil Return
External (Y)
Pilot Oil Supply
External (X)
Spool Symbol
H
Way Configuration
4-way
Weight (one Solenoid)
17.6 kg
1620 Old Apex Road
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