Bosch Rexroth | H-4WEH25D6X6EG24N9ETS2K4B10D3
H-4WEH25D6X/6EG24N9ETS2K4/B10D3
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The H-4WEH25D6X/6EG24N9ETS2K4/B10D3 directional spool valve is part of the WEH Directional Spool Valves series made by Bosch Rexroth for hydraulic automation where precise on-off flow control is required. It fits the NG25 nominal size, establishing the interface dimensions and basic flow channel area. A porting pattern of ISO 4401-08-08-0-05 matches common subplates so installation in standardized manifolds is straightforward. Electrical actuation is supplied by a 24 V DC coil that shifts the spool when energized through a DIN EN 175301-803 (K4) connector. If electrical power is absent, a concealed manual override identified as N9 permits local shifting. The main pressure rating reaches 350 bar at the P, A, and B ports, enabling use in high-pressure circuits, while the T port is limited to 250 bar to protect the tank return path. With symbol D at 280 bar, the valve maintains a performance limit of 350 l/min, showing the maximum flow it can pass without undue pressure loss.
For the pilot stage the manufacturer permits a maximum pressure of 250 bar, while a minimum of 13 bar is necessary on a two-spool configuration to guarantee reliable shifting. A secondary pilot pressure setting of 45 bar labeled d3 supports remote control circuits that demand a fixed command level. The two-spool version draws 28.4 cm³ of pilot oil per cycle, and a 1.0 mm throttle orifice meters that flow to stabilize response times. Mechanical attachment uses six M12 × 60 screws conforming to ISO 4762, and each screw must be tightened to 100 Nm to secure the housing against manifold leakage. The mean time to dangerous failure (Mttfd) is stated at 100 years, giving designers a long statistical service life for safety calculations. Together these parameters define the operating envelope and mounting requirements so the valve can deliver consistent directional control in press machinery, extrusion lines, and similar systems.
Technical Specifications
Coil Voltage
24 V DC
Electrical Connection
DIN EN 175301-803 (K4)
Manual Override
Concealed (N9)
Max Operating Pressure (p/a/b)
350 bar
Max Operating Pressure (t Port)
250 bar
Max Pilot Pressure
250 bar
Min Pilot Pressure (2-spool)
13 bar
Mounting Screws
6x M12 x 60 (ISO 4762)
Mttfd (weh)
100 years
Nominal Size
NG25
Performance Limit (symbol D @ 280 Bar)
350 l/min
Pilot Pressure (d3 Secondary)
45 bar
Pilot Volume (2-spool)
28.4 cm3
Porting Pattern
ISO 4401-08-08-0-05
Throttle Orifice Diameter
1.0 mm
Tightening Torque (m12 Screws)
100 Nm
1620 Old Apex Road
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