Bosch Rexroth | H-4WEH25D6X6EW110N9DA
H-4WEH25D6X/6EW110N9DA
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The H-4WEH25D6X/6EW110N9DA directional spool valve belongs to the WEH Directional Spool Valves series produced by Bosch Rexroth and is intended for automated hydraulic flow control. Electro-hydraulic actuation drives a 4-way spool configured to symbol D, giving two discrete flow states for pressure and return lines. Nominal size NG25 supports the flow rates typical of mid-capacity systems, while the ISO 4401-10-09-0-05 porting pattern permits direct mounting on standardized subplates. Installation uses six M12 × 60 screws that must be tightened to 100 Nm to maintain gasket compression. System oil must be filtered to ISO 4406 20/18/15 so that the spool lands remain free of abrasive wear.
A high-power 6E pilot stage shifts the main spool against working pressures that reach 350 bar on ports P, A, and B. The pilot circuit tolerates up to 250 bar but needs at least 13 bar to operate in two-spool mode, and each actuation fills a 28.4 cm³ pilot volume that influences response speed. A concealed manual override enables manual stroking during setup or fault clearing without exposing moving parts. These characteristics allow the valve to combine compact electro-hydraulic actuation with defined pressure limits and cleanliness requirements for consistent motion control in industrial machines.
Technical Specifications
Actuation Type
Electro-Hydraulic
Fluid Cleanliness Class
ISO 4406 20/18/15
Manual Override
Concealed
Max Operating Pressure (p, A, B)
350 bar
Max Pilot Pressure
250 bar
Min Pilot Pressure (2-spool)
13 bar
Mounting Screws
6 x M12 x 60
Nominal Size
NG25
Pilot Valve Type
6E (High-Power)
Pilot Volume (2-spool)
28.4 cm3
Porting Pattern
ISO 4401-10-09-0-05
Screw Tightening Torque
100 Nm
Spool Symbol
D
Ways
4
1620 Old Apex Road
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