Bosch Rexroth | H-4WEH25E6X6EW110N9S2DAL
H-4WEH25E6X/6EW110N9S2DAL
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The H-4WEH25E6X/6EW110N9S2DAL valve belongs to the WEH Directional Spool Valves series manufactured by Bosch Rexroth. It directs hydraulic flow in automated circuits by shifting a NG25 spool that is actuated electro-hydraulically, allowing remote electrical commands to move the main stage. The design is a 4-way layout so it can connect pressure, tank, and two work ports for bidirectional cylinder control. A built-in 6E pilot valve applies control pressure to reposition the spool precisely. The main ports tolerate operating pressures up to 350 bar, while the flow path marked with the e symbol passes up to 650 l/min at 350 bar to support large actuator speeds.
Installation follows the ISO 4401-08-08-0-05 pattern so the valve bolts directly to standardized subplates without adapters. Pilot circuitry may reach 250 bar, and a spring-centered version needs at least 13 bar pilot pressure to shift fully. The drain line for pilot return may be pressurized to 160 bar, allowing the valve to share a common tank manifold without risk of back-pressure malfunction. Timing can be fine-tuned through the S2 switching time adjustment so motion profiles match machine cycle requirements. Fluid entering the valve must meet ISO 4406 class 20/18/15 cleanliness, limiting particulate wear and maintaining spool accuracy.
Technical Specifications
Actuation
Electro-Hydraulic
Hydraulic Fluid Cleanliness
ISO 4406 (c) 20/18/15
Max Flow (e Symbol, 350 Bar)
650 l/min
Max Operating Pressure (p, A, B)
350 bar
Max Pilot Pressure
250 bar
Min Pilot Pressure (3-pos Spring)
13 bar
Mounting Pattern
ISO 4401-08-08-0-05
Nominal Size
NG25
Pilot Return (y) Max Pressure (ac)
160 bar
Pilot Valve Type
6E
Switching Time Adjustment
S2
Way Count
4-Way
1620 Old Apex Road
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