Bosch Rexroth | H-4WEH25E6X6EG24N9S2K4
H-4WEH25E6X/6EG24N9S2K4
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The H-4WEH25E6X/6EG24N9S2K4 is an electro-hydraulic spool valve manufactured by Bosch Rexroth within the WEH Directional Spool Valves series. It diverts flow in automated hydraulic systems and provides three switching positions for bidirectional motion control. A spring-centered return recenters the spool when pilot pressure is lost. Nominal size 25 mates to the ISO 4401-08-08-0-05 porting pattern so it fits common subplates. External pilot oil supply isolates the control stage from main-line pressure, and a minimum pilot pressure of 13 bar is needed to shift the three-position spring-loaded spool. The coil operates on 24 V DC, while a concealed manual override permits local actuation during commissioning. Pilot volume for one shift is 14.2 cm³.
The valve withstands a maximum operating pressure of 350 bar at ports P, A, and B, while pilot lines may be loaded up to 250 bar and the pilot return path tolerates 210 bar. Under symbol E at 350 bar it passes up to 650 l/min, enabling fast cylinder or motor movement. Cleanliness class ISO 4406 20/18/15 defines the oil purity required to keep the spool lands free of abrasive particles. Six M12×60 mounting screws secure the body to the subplate and keep sealing surfaces rigid under load. These pressure limits give designers a clear margin between control stage and main passage, while the high flow capacity minimizes energy loss across the valve body.
Technical Specifications
Cleanliness Class
ISO 4406 20/18/15
Coil Voltage
24 V DC
Manual Override
Concealed
Max Flow (symbol E, 350 Bar)
650 l/min
Max Operating Pressure (p,a,b)
350 bar
Max Pilot Pressure
250 bar
Max Pressure (pilot Return, Dc)
210 bar
Min Pilot Pressure (3-pos Spring)
13 bar
Mounting Screws
6 × M12 × 60
Nominal Size
25
Pilot Oil Supply
External
Pilot Volume (3-pos Spring)
14.2 cm3
Porting Pattern
ISO 4401-08-08-0-05
Spool Return
Spring-Centered
Switching Positions
3
Valve Type
Electro-Hydraulic
1620 Old Apex Road
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