Bosch Rexroth | H-4WEH25HE6X6EG24NK4B12V
H-4WEH25HE6X/6EG24NK4/B12V
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The H-4WEH25HE6X/6EG24NK4/B12V valve belongs to the WEH Directional Spool Valves series from Bosch Rexroth and directs pressure and return flow in automated hydraulic circuits. It is built to nominal size NG25, providing passage dimensions suited for large flow rates. The control spool is returned hydraulically so pilot pressure recenters the element without the use of springs. Pilot oil is supplied externally, allowing the designer to choose a clean pressure source, and it is returned externally to prevent back-pressure from slowing the spool. The pressure-centered pilot stage needs at least 18 bar to shift, while the pilot circuitry can withstand up to 250 bar during operation. A manual override is included so service personnel can shift the valve when electrical power is unavailable.
The solenoid operates on a 24 V DC supply and connects through a DIN EN 175301-803 K4 plug for straightforward wiring. With spool type E the valve handles up to 700 l/min, and ports P, A, and B tolerate system pressures as high as 350 bar. Port T endures 250 bar back-pressure, while the external port Y accepts up to 210 bar for pilot oil drainage. An ISO 4401-08-08-0-05 porting pattern matches common NG25 subplates, simplifying manifold mounting. FKM seals, designated by code V, protect against high temperature and aggressive fluids. A Ø1.2 mm throttle insert marked B12 can be installed to limit inlet flow and damp pressure spikes.
Technical Specifications
Control Spool Return
Hydraulic
Electrical Connection
DIN EN 175301-803 (K4)
Manual Override
Yes
Max Flow (spool E)
700 l/min
Max Operating Pressure (p, A, B)
350 bar
Max Pilot Pressure
250 bar
Max Pressure Port T
250 bar
Max Pressure Port Y (external, Dc)
210 bar
Min Pilot Pressure (pressure-centered)
18 bar
Nominal Size
NG25 ("W.H 25")
Pilot Oil Return
External
Pilot Oil Supply
External
Porting Pattern
ISO 4401-08-08-0-05
Seal Material
FKM (Code V)
Supply Voltage
24 V DC
Throttle Insert
Ø1.2 mm (B12)
1620 Old Apex Road
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