Bosch Rexroth | H-4WEH25J6X6EW110N9TSK4V
H-4WEH25J6X/6EW110N9TSK4/V
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The H-4WEH25J6X/6EW110N9TSK4/V directional spool valve belongs to the WEH Directional Spool Valves series produced by Bosch Rexroth for automated hydraulic circuits and uses electro-hydraulic actuation so an internal pilot stage drives the main spool without large solenoid forces. The pilot stage is a 4WE 6E valve that meters pilot flow to shift the main element when the hydraulic control signal is present. Spool movement begins once pilot pressure reaches 18 bar and remains stable up to 250 bar, giving a usable control range for typical power units. The main spool offers three distinct positions defined by the J symbol to route or block flow as required by mobile or industrial machinery. After actuation, hydraulic pressure returns the spool to its neutral position, eliminating the need for external springs. Flow capacity corresponds to nominal size NG25, matching medium-frame pumps and actuators.
System ports P, A, and B may be pressurized to 350 bar, while port T is limited to 250 bar so the drain line must be sized accordingly. The valve mounts on a subplate that follows the ISO 4401-10-09-0-05 pattern, allowing interchange with other NG25 components in a standardized stack. FKM seals tolerate high-temperature oils and many synthetic fluids, enhancing chemical compatibility over long service periods. Oil cleanliness must be kept at ISO 4406 code 20/18/15 or better to protect the precision spool surfaces from wear. A concealed manual override lets maintenance staff shift the valve during commissioning without exposing the mechanism to contaminants. Mean time to dangerous failure is calculated at 100 years, supporting long duty cycles in process automation.
Technical Specifications
Actuation Type
Electro-Hydraulic
Cleanliness Class
ISO 4406 20/18/15
Main Spool Return
Hydraulic
Manual Override
Concealed
Max Pilot Pressure
250 bar
Max Pressure (p, A, B)
350 bar
Max Pressure (port T)
250 bar
Min Pilot Pressure
18 bar
Mounting Type
Subplate
Mttfd
100 Years
Nominal Size
NG25
Pilot Valve Type
4WE 6E
Porting Pattern
ISO 4401-10-09-0-05
Seal Material
FKM
Spool Positions
3
Spool Symbol
J
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