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The 4WEH32H6X/6EW110N9DAL valve belongs to the WEH Directional Spool Valves series and is manufactured by Bosch Rexroth for hydraulic automation circuits that require precise flow direction under remote electrical control. It is an electro-hydraulic unit that shifts the spool with pilot oil when the solenoid is energized. The component is built in nominal size NG32 so it matches manifolds designed for that cavity size, and the 4-way configuration provides two service ports, a pressure port, and a tank return for bidirectional actuator movement. In the pressure-centered zero position the spool blocks the service lines until a control signal is applied, ensuring hydraulic stability at rest. Subplate mounting simplifies replacement while the ISO 4401-10-09-0-05 porting pattern aligns the pressure and work ports without adapter plates. Correct installation is horizontal to keep the pilot passages fully flooded, and a concealed manual override lets maintenance staff shift the spool during commissioning without exposing moving parts. A minimum pilot pressure of 8.5 bar is required to center the spool reliably after each cycle.
The valve accommodates a continuous flow of 1100 l/min so it can serve large cylinders or motors without excessive pressure drop. Working ports P, A, and B tolerate operating pressures up to 350 bar, while the pilot stage and tank port are limited to 250 bar to protect the return and control lines. The pilot supply must also stay below 250 bar, and the internal pilot chamber volume of 14.4 cm³ determines the response time when the spool is shifted from the pressure-centered position toward port a. Fluid cleanliness must be maintained at ISO 4406 class 20/18/15 to avoid wear on the sliding surfaces. The design achieves a mean time to dangerous failure of 100 years, which supports long service intervals in safety-related systems.
Actuation
Electro-Hydraulic
Cleanliness Class (iso 4406)
20/18/15
Installation Position
Horizontal
Manual Override
Concealed
Max Flow
1100 l/min
Max Operating Pressure (p,a,b)
350 bar
Max Pilot Pressure
250 bar
Max Pressure Port T
250 bar
Min Pilot Pressure (pressure-centered)
8.5 bar
Mounting Type
Subplate
Mttfd
100 years
Nominal Size
NG32
Pilot Volume Zero→“a” (pressure-centered)
14.4 cm3
Porting Pattern
ISO 4401-10-09-0-05
Way Configuration
4-Way
Zero Position
Pressure-Centered
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