Bosch Rexroth | H-4WEH25D6X6EG24N9DK25LQMBG24
H-4WEH25D6X/6EG24N9DK25LQMBG24
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The H-4WEH25D6X/6EG24N9DK25LQMBG24 valve belongs to the WEH Directional Spool Valves series from Bosch Rexroth and directs hydraulic flow in automated machinery. It is an electro-hydraulic unit that combines a pilot solenoid with a high-capacity main stage for precise switching. The nominal size is NG25, allowing full-bore passages sized for large circuits. Its spool symbol D defines the internal flow paths, and the design offers two discrete spool positions for simple open-or-close functions. The valve accepts up to 700 l/min under symbol D, so it can handle high pumping rates without excessive pressure drop. Ports P, A, and B withstand operating pressures up to 350 bar, supporting heavy-duty cylinders and motors. A concealed N9 manual override lets service staff shift the spool mechanically when electrical power is unavailable. Position “b” monitoring under code QMBG24 supplies an electrical feedback of the achieved spool position for safety interlocks and diagnostics.
Control oil reaches the pilot stage through external port X and leaves through external port Y, so the main flow is not disturbed by pilot return oil. The pilot solenoid is rated for 24 V DC, enabling direct connection to common PLC outputs. Pilot pressure may climb to 250 bar while the tank port T is limited to 250 bar to protect return lines. For reliable actuation with the two-position spool, a minimum pilot pressure of 13 bar is required. Hydraulic fluid must meet ISO 4406 (c) 20/18/15 cleanliness to prevent wear in the precision-ground lands. Mounting follows the ISO 4401-08-08-0-05 porting pattern, allowing the valve to bolt onto standard subplates. The pilot control design yields fast response yet keeps heat generation low, and all wetted passages operate within the stated cleanliness and pressure limits.
Technical Specifications
Actuation Type
Electro-Hydraulic
Fluid Cleanliness Class
ISO 4406 (c) 20/18/15
Manual Override
Concealed (N9)
Max Flow (symbol D)
700 l/min
Max Operating Pressure (p,a,b)
350 bar
Max Pilot Pressure
250 bar
Max Pressure Port T
250 bar
Min Pilot Pressure (2-spool)
13 bar
Nominal Size
NG25
Pilot Oil Return
External (Y)
Pilot Oil Supply
External (X)
Pilot Valve Voltage
24 V DC
Porting Pattern
ISO 4401-08-08-0-05
Spool Pos Monitoring
Position "b" (QMBG24)
Spool Positions
2
Spool Symbol
D
1620 Old Apex Road
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