Bosch Rexroth | H-4WEH32D6X6EW110N9SK4
H-4WEH32D6X/6EW110N9SK4
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The H-4WEH32D6X/6EW110N9SK4 valve belongs to the WEH Directional Spool Valves series manufactured by Bosch Rexroth for hydraulic automation circuits that need rapid, high-capacity flow control. Electro-hydraulic actuation permits remote electrical commands to shift the spool while hydraulic pilot pressure performs the mechanical movement. As a four-way design it can direct pump flow to either service port and simultaneously connect the opposite port to tank. Nominal size 32 passages allow a maximum flow of 1100 l/min, supporting large cylinder or motor groups without excessive pressure drop. The main stage withstands 350 bar at ports P, A, and B, so it can operate in high-pressure industrial power units. Internal pilot oil supply feeds the control edges, while an external pilot oil return prevents back-pressure from influencing the actuation. A single-solenoid 4WE6 D pilot valve produces the directional signal for the main spool.
For stable centering, the main spool is returned hydraulically once pilot pressure is vented. Switching time can be adjusted through supply control to match system response requirements. A concealed manual override lets maintenance staff shift the valve locally without energizing the solenoid. Electrical power reaches the pilot via a DIN EN 175301-803 K4 connector that supports standardized cable assemblies. The mounting face follows the ISO 4401-10-09-0-05 porting pattern, ensuring drop-in interchangeability with other NG32 subplates. A surface coating up to 100 µm thick guards against corrosion in damp plant environments. Fluid cleanliness should not exceed ISO 4406 code 20/18/15 to maintain sealing integrity and motion accuracy. The mean time to dangerous failure for this WEH type is 100 years, contributing to long service life in continuous duty installations.
Technical Specifications
Actuation Type
Electro-Hydraulic
Cleanliness Class
ISO 4406 20/18/15
Electrical Connection
DIN EN 175301-803 (K4)
Main Valve Spool Return
Hydraulic
Manual Override
Concealed
Max Operating Pressure (p, A, B)
350 bar
Maximum Flow
1100 l/min
Mttfd (type Weh)
100 years
Nominal Size (ng)
32
Pilot Control Valve
4WE6 D (1 solenoid)
Pilot Oil Return
External
Pilot Oil Supply
Internal
Porting Pattern
ISO 4401-10-09-0-05
Surface Coating Thickness
100 µm (max)
Switching Time Adjustment
Supply Control
Ways
4
1620 Old Apex Road
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