Bosch Rexroth | H-4WH25HD6X
H-4WH25HD6X/
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The H-4WH25HD6X/ valve is produced by Bosch Rexroth as part of the WEH Directional Spool Valves series. It serves to shift flow paths in hydraulic automation loops where remote pilot lines control main system flow. The design uses hydraulic actuation combined with pilot-operated mechanics to move the D-coded spool within a 4-way channel arrangement. Nominal size NG25 allows the body to fit into installations that follow the ISO 4401-08-08-0-05 porting pattern. Control oil enters through pilot port X and drains through port Y, while hydraulic forces also provide the spool return function so no mechanical springs are required. These construction choices let the unit deliver consistent directional control while matching common manifold standards.
The main flow section withstands 350 bar on ports P, A, and B, and it accepts up to 700 l/min when the hd symbol is specified, supporting high-volume circuits. Pilot operation begins at 8 bar and remains safe up to 250 bar, the same ceiling that applies to ports T and Y for return lines. A surface coating limited to 100 µm guards the housing against corrosion without affecting envelope size. Functional lifetime is reflected in an MTTFd of 150 years, providing a very high reliability metric for safety calculations. Together these pressure ratings, flow capacity, and durability characteristics define the valve’s suitability for demanding hydraulic power units.
Technical Specifications
Actuation
Hydraulic
Max Flow (hd Symbol)
700 l/min
Max Pilot Pressure
250 bar
Max Pressure (port T)
250 bar
Max Pressure (port Y)
250 bar
Min Pilot Pressure
8 bar
Mttfd (en Iso 13849)
150 years
Nominal Size
NG25
Operating Pressure (p/a/b)
350 bar
Operation
Pilot-Operated
Pilot Ports
X (supply), Y (return)
Porting Pattern
ISO 4401-08-08-0-05
Spool Return
Hydraulic
Spool Symbol
D
Surface Coating Thickness
100 µm (max)
Way Configuration
4-way
1620 Old Apex Road
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