Bosch Rexroth | H-4WEH32G6X6EW110N9S2K4
H-4WEH32G6X/6EW110N9S2K4
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The H-4WEH32G6X/6EW110N9S2K4 directional spool valve is manufactured by Bosch Rexroth within the WEH Directional Spool Valves series. It controls hydraulic flow through an electro-hydraulic actuation stage that pilots the main spool for automated machine functions. Valve size NG32 defines the port diameter, while the 4-way channel layout provides separate pressure, tank, and two work ports. Three distinct spool positions create neutral, extend, and retract states for cylinders. A flow capacity of 450 l/min at 350 bar supports high-volume circuits, and the maximum operating pressure is limited to 350 bar. The spool is supplied with pilot oil from an external X line, and this circuit may reach 250 bar to guarantee reliable shifting. Installation follows the ISO 4401-10-09-0-05 porting pattern so the body mounts directly on standardized sub-plates.
A minimum pilot pressure of 8.5 bar is sufficient to move the spool in three-position operation, and switching time can be tuned through the discharge control feature. A concealed manual override permits emergency shifting without exposing internal parts. Electrical termination is handled through a DIN EN 175301-803 connector for straightforward field wiring. The hydraulic medium must meet a cleanliness level of 20/18/15 under ISO 4406 to protect the precision-fit spool lands. Secure attachment to a manifold uses six M20 x 80 mounting screws specified in ISO 4762, and each screw is tightened to 340 Nm with a ±10 percent tolerance.
Technical Specifications
Actuation Type
Electro-Hydraulic
Electrical Connection
DIN EN 175301-803
Flow Limit (g, 350 Bar)
450 l/min
Fluid Cleanliness Class
20/18/15 (ISO 4406)
Manual Override
Concealed
Max Operating Pressure
350 bar
Max Pilot Pressure
250 bar
Min Pilot Pressure (3-pos)
8.5 bar
Mounting Screws
6x M20 x 80 (ISO 4762)
Mounting Torque
340 Nm ±10%
Pilot Oil Supply
External (X)
Porting Pattern
ISO 4401-10-09-0-05
Spool Positions
3 Positions
Switching Time Adjustment
Discharge Control
Valve Size
NG32
Way Configuration
4-Way
1620 Old Apex Road
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