Bosch Rexroth | H-4WEH25HD6X6EW110N9S2DAL-CSA
H-4WEH25HD6X/6EW110N9S2DAL CSA
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The H-4WEH25HD6X/6EW110N9S2DAL CSA valve belongs to the WEH Directional Spool Valves series manufactured by Bosch Rexroth for hydraulic automation where fast, high-flow directional control is required. It uses electro-hydraulic actuation so an electrical signal shifts a hydraulically piloted spool, combining low control power with high output force. The unit is built in nominal size NG25, enabling a maximum flow of 700 l/min through a 4-way flow path to drive large cylinders or motors. The D-coded spool provides the required overlap for positive sealing, while hydraulic return force re-centers the spool when pilot pressure is removed. Operating ports P, A, and B tolerate pressures up to 350 bar, and port Y can withstand 160 bar, allowing use in heavy-duty circuits. Stable function is retained once pilot pressure reaches 8 bar, and the pilot stage accepts up to 250 bar, ensuring reliable shifting under variable system conditions.
Installation follows the ISO 4401-08-08-0-05 interface, secured with six M12 × 60 screws to maintain gasket compression at full pressure. A concealed manual override labeled N9 lets maintenance staff reposition the spool during commissioning without exposing moving parts. Switching time can be adjusted by the S2 discharge device so operators can fine-tune response to match actuator mass. The integrated 4WE 6E pilot control valve directs pilot oil to the main stage, simplifying plumbing on manifold blocks. ISO 4406 cleanliness class 20/18/15 must be met so internal clearances are not obstructed by particulate contamination. The valve carries a spool return spring dedicated to hydraulic reset, so external springs are unnecessary. Every listed feature supports dependable service life in automated presses, molding machines, and similar equipment that demand precise, repeatable flow direction at high volume.
Technical Specifications
Actuation Type
Electro-Hydraulic
Cleanliness Class
ISO 4406 20/18/15
Main Spool Return
Hydraulic
Manual Override
Concealed (N9)
Max Flow
700 l/min
Max Operating Pressure (p, A, B)
350 bar
Max Pilot Pressure
250 bar
Min Pilot Pressure (hydraulic End)
8 bar
Mounting Interface
ISO 4401-08-08-0-05
Mounting Screws
6 × M12 × 60
Nominal Size
NG25 (W.H 25)
Pilot Control Valve
4WE 6E
Port Y Max Pressure (ac)
160 bar
Spool Symbol
D
Switching Time Adjustment
Discharge (S2)
Way Configuration
4-Way
1620 Old Apex Road
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