Bosch Rexroth | H-4WEH25G6X6EW110N9S2K4
H-4WEH25G6X/6EW110N9S2K4
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The H-4WEH25G6X/6EW110N9S2K4 directional spool valve belongs to the WEH Directional Spool Valves series and is produced by Bosch Rexroth for automated hydraulic circuits. It controls flow and direction in NG25 lines, integrating into subplate layouts for quick replacement. Compliance with ISO 4401 porting allows direct interchange with standard manifolds. The service ports can tolerate up to 350 bar, while the tank port is limited to 250 bar, permitting use in high-pressure transmission loops. With symbol G at 350 bar, the valve passes up to 400 l/min, matching the capacity of large pumps. Pilot actuation is supported up to 250 bar and requires at least 13 bar to center the spool, securing reliable shift behavior under varying supply conditions.
Electrical connection is provided through a DIN EN 175301-803 K4 plug, giving a sealed interface for the solenoid. A concealed manual override labeled N9 lets maintenance staff shift the spool without energizing the coil. The S2 discharge adjustment permits controlled switching time to match circuit dynamics. Internal pilot return Y may experience backpressure up to 160 bar without impairing function, and the spring-centered pilot cavity holds 14.2 cm³ of oil that influences response. Acceptable hydraulic fluid cleanliness is ISO 4406 class 20/18/15 to prevent wear, and continuous operation is supported between -20 °C and +80 °C to suit outdoor or enclosed machinery.
Technical Specifications
Electrical Connection
DIN EN 175301-803 (K4)
Fluid Cleanliness Class
ISO 4406 20/18/15
Hydraulic Fluid Temp Max
+80 °C
Hydraulic Fluid Temp Min
−20 °C
Manual Override
Concealed (N9)
Max Operating Pressure (p, A, B)
350 bar
Max Operating Pressure (t)
250 bar
Max Pilot Pressure
250 bar
Min Pilot Pressure (spring-centered)
13 bar
Mounting
Subplate
Nominal Size
NG25
Performance Limit (symbol G @ 350 Bar)
400 l/min
Pilot Return Y Internal Max (ac)
160 bar
Pilot Volume (spring-centered)
14.2 cm3
Porting Pattern
ISO 4401
Switching Time Adjustment
S2 (Discharge)
1620 Old Apex Road
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