Bosch Rexroth | H-4WEH25G6X6EG24N9K4
H-4WEH25G6X/6EG24N9K4
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The H-4WEH25G6X/6EG24N9K4 is a directional spool valve produced by Bosch Rexroth for the WEH Directional Spool Valves series. It directs pressurized fluid to actuators in hydraulic automation circuits and returns flow to tank when required. The nominal size of 25 (NG25) defines the mounting footprint and governs the achievable flow rate in high-power systems. A 4-way configuration provides four ports so the valve can alternate supply and return lines to a cylinder. The porting pattern ISO 4401-10-09-0-05 matches standardized subplates, simplifying manifold installation. A maximum operating pressure of 350 bar permits use in heavy-duty machines, while a pilot supply may reach 250 bar without damaging internal components. To initiate movement, a pressure-centered version needs at least 18 bar pilot pressure, and a spring-centered version needs 13 bar. A concealed manual override identified as N9 lets maintenance personnel shift the spool when electrical control is unavailable. The solenoid accepts a 24 V DC coil, and the DIN EN 175301-803 K4 plug provides quick electrical coupling.
Fluid requirements and return conditions complete the operating envelope. The cleanliness class ISO 4406 20/18/15 limits particulate contamination to protect the spool lands from wear and sticking during frequent shifts. Acceptable viscosity spans from 2.8 mm²/s to 500 mm²/s, allowing the valve to function with light to heavy hydraulic oils without hindering response times. Hydraulic temperature may range from −20 °C to +80 °C when nitrile seals are fitted, so the unit remains stable in cold starts and elevated ambient heat found near powerpacks. A pilot return routed through port Y can withstand back-pressure up to 210 bar, enabling remote tank lines without risk of leakage past the pilot piston during dynamic cycles. By respecting these limits, system designers secure consistent switching, maintain internal clearances, and extend service life in mobile and industrial hydraulic equipment.
Technical Specifications
Cleanliness Class
ISO 4406 20/18/15
Coil Voltage (dc)
24 V
Electrical Connection
DIN EN 175301-803 (K4)
Hydraulic Fluid Temp Max (nbr)
+80 C
Hydraulic Fluid Temp Min (nbr)
−20 C
Manual Override
Concealed (N9)
Max Operating Pressure
350 bar
Max Pilot Pressure
250 bar
Max Pilot Return Pressure (port Y)
210 bar
Min Pilot Pressure (pressure-centered)
18 bar
Min Pilot Pressure (spring-centered)
13 bar
Nominal Size
25 (NG25)
Porting Pattern
ISO 4401-10-09-0-05
Viscosity Max
500 mm2/s
Viscosity Min
2.8 mm2/s
Way Configuration
4-Way
1620 Old Apex Road
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