Bosch Rexroth | H-4WEH25H6X6EG12N9TDAL
H-4WEH25H6X/6EG12N9TDAL
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The H-4WEH25H6X/6EG12N9TDAL directional spool valve belongs to the WEH Directional Spool Valves series from Bosch Rexroth and is used to route pressurized oil in automated hydraulic circuits. It is built in size NG25 and follows the ISO 4401-08-08-0-05 porting pattern to fit standardized sub-plates. Flow paths return to a pressure-centered zero position, and the pilot stage holds that state as long as at least 18 bar is available. A high-power 6E pilot control valve shifts the main spool when the external pilot oil supply on port X is energized, while spent pilot fluid is drained through the internal T return. The main flow channels can withstand 350 bar on ports P, A, and B, and 250 bar on port T, giving the unit headroom for high-pressure actuation in presses or molding machines.
The pilot section accepts up to 250 bar and moves 7.15 cm³ of oil per stroke, ensuring rapid spool travel with modest pilot flow demand. Fluid cleanliness must reach ISO 4406 (c) 20/18/15 to maintain sealing integrity and service life. Installation uses six M12 × 60 mounting screws tightened to 100 Nm, aligning the 19.0 kg valve securely on the manifold. The design achieves a mean time to dangerous failure of 100 years, providing long functional safety in continuous-duty hydraulic automation.
Technical Specifications
Cleanliness Class
ISO 4406 (c) 20/18/15
Max Operating Pressure (p, A, B)
350 bar
Max Operating Pressure (port T)
250 bar
Maximum Pilot Pressure
250 bar
Min Pilot Pressure (pressure-centered)
18 bar
Mounting Screws
M12 x 60 (6 pcs)
Mttfd
100 Years
Pilot Control Valve
High-Power (6E)
Pilot Oil Return
Internal (T)
Pilot Oil Supply
External (X)
Pilot Volume (0->a)
7.15 cm3
Porting Pattern
ISO 4401-08-08-0-05
Screw Tightening Torque (m12)
100 Nm
Size
NG25
Weight (two Solenoids, Pressure-centered)
19.0 kg
Zero Position
Pressure-Centered
1620 Old Apex Road
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