Bosch Rexroth | H-4WEH25E6X6EW110N9DALP45V
H-4WEH25E6X/6EW110N9DAL/P4.5V
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The H-4WEH25E6X/6EW110N9DAL/P4.5V directional spool valve belongs to the WEH Directional Spool Valves series from Bosch Rexroth. In hydraulic automation it shifts high-pressure oil between work lines under remote electrical control. Electro-hydraulic actuation converts a solenoid signal into pilot flow so the main spool moves without large coil force. Nominal size NG25 establishes port dimensions, and a performance limit of 650 l/min at 350 bar shows the unit can feed sizable actuators without excessive pressure loss. Ports P, A, and B tolerate up to 350 bar, while the pilot circuit may rise to 250 bar, providing ample margin for rapid shifting. A spring-centered design needs at least 13 bar pilot pressure to reach both end positions. The E-coded spool defines the internal flow paths, and hydraulic return brings the spool back to center once pilot pressure is removed.
For installation the valve uses the ISO 4401-08-08-0-05 mounting interface so it bolts directly to standard NG25 subplates. A concealed manual override allows local shifting during setup without exposing moving parts. The external drain port Y can handle 160 bar, enabling operation with elevated tank back pressure. Pilot fluid is released through a cartridge that cracks at 4.5 bar to prevent unintended spool movement. FKM seals provide chemical resistance to conventional hydraulic oils. A protective coating up to 100 µm thick guards the body against corrosion while maintaining dimensional accuracy. The circuit must supply oil at ISO 4406 class 20/18/15 cleanliness to limit wear on the spool lands. A calculated MTTFd of 100 years signals a very low probability of dangerous failure during the intended service life.
Technical Specifications
Coating Thickness (max)
100 µm
Control Spool Return (main)
Hydraulic
Fluid Cleanliness Class (iso 4406)
20/18/15
Manual Override
Concealed
Max Operating Pressure (p,a,b)
350 bar
Max Pressure (y External, Ac)
160 bar
Maximum Pilot Pressure
250 bar
Minimum Pilot Pressure (3-pos, Spring-centered)
13 bar
Mounting Interface
ISO 4401-08-08-0-05
Mttfd (type Weh)
100 years
Nominal Size
NG25
Performance Limit Flow (e @ 350 Bar)
650 l/min
Preload Valve Cracking Pressure
4.5 bar
Seal Material
FKM
Spool Symbol
E
Valve Actuation
Electro-Hydraulic
1620 Old Apex Road
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