Bosch Rexroth | H-4WEH25HD6X6EG24N9K4B10
H-4WEH25HD6X/6EG24N9K4/B10
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The H-4WEH25HD6X/6EG24N9K4/B10 directional spool valve is produced by Bosch Rexroth for the WEH Directional Spool Valves series. It directs hydraulic flow in automated machinery by shifting a size 25 spool that is identified by symbol D for the required flow paths. The valve is mounted on a subplate, so installation follows common manifold layouts where multiple components share a base. Its interface complies with the ISO 4401-08-08-0-05 porting pattern, ensuring alignment with standard 08 size manifold ports. A pilot control valve coded 6E actuates the main spool, letting the pilot stage handle shifting forces independently of load pressure. During operation the valve passes up to 300 l/min at 350 bar, providing high flow capacity at full system pressure. Coil energization uses a 24 V DC solenoid, which matches common machine control voltages. A concealed manual override marked N9 allows local spool actuation when electrical power is unavailable.
External pilot oil supply through port X isolates the control stage from main line pressure, while external return through port Y carries exhaust oil back to tank. The pilot circuit tolerates pressures up to 250 bar, and the return line is limited to 210 bar to protect the drain gallery. Hydraulic spring chambers return the main spool to its neutral position without relying on mechanical springs, as indicated by the hydraulic spool return configuration. A throttle insert with a 1.0 mm orifice, designated B10, is fitted to moderate pilot flow and prevent overlap shock during shifting. Electrical connection is provided by a DIN EN 175301-803 plug coded K4, giving a keyed interface for quick service. The arrangement of these features supports controlled, repeatable flow reversal in high-pressure hydraulic systems used in industrial automation.
Technical Specifications
Electrical Connection
DIN EN 175301-803 (K4)
Main Spool Return
Hydraulic
Manual Override
Concealed (N9)
Max Flow (symbol D, 350 Bar)
300 l/min
Max Operating Pressure (p,a,b)
350 bar
Max Pressure (pilot Return Y, External, Dc)
210 bar
Maximum Pilot Pressure
250 bar
Mounting Type
Subplate
Pilot Control Valve
6E
Pilot Oil Return
External (Y)
Pilot Oil Supply
External (X)
Porting Pattern
ISO 4401-08-08-0-05
Solenoid Voltage
24 V (DC)
Spool Symbol
D
Throttle Insert
Ø1.0 mm (B10)
Valve Size (ng)
25
1620 Old Apex Road
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