Bosch Rexroth | 4WEH32RB6X6EW110N9TDAL
4WEH32RB6X/6EW110N9TDAL
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The 4WEH32RB6X/6EW110N9TDAL directional spool valve is produced by Bosch Rexroth within the WEH Directional Spool Valves series. It directs hydraulic flow in industrial automation by shifting a NG32 spool, corresponding to a nominal size of 32. A maximum flow rate of 1100 l/min allows it to feed large actuators, while ports p, A, and B tolerate up to 280 bar during operation. The pilot stage functions with as little as 8.5 bar, and each spring-centered actuation moves 29.4 cm³ of pilot oil. Ports follow the ISO 4401-10-09-0-05 pattern so the body aligns with common interfaces, and the unit is intended for subplate mounting to speed replacement during maintenance.
The pilot supply may reach 250 bar, but the return line at port y is limited to 160 bar when powered by an AC coil to protect internal seals. Port T withstands 250 bar, supporting circuits that impose back-pressure on the tank connection. Hydraulic fluid must meet ISO 4406 (c) 20/18/15 cleanliness to minimize wear, which contributes to the mean time to dangerous failure of 100 years assigned to this valve. Installation uses six M20 × 80 screws specified in ISO 4762; each fastener is tightened to 340 Nm to secure the housing. These mechanical limits and pressure ratings ensure reliable spool positioning in high-duty hydraulic automation systems.
Technical Specifications
Cleanliness Class
ISO 4406 (c) 20/18/15
Max Flow
1100 l/min
Max Operating Pressure (p, A, B)
280 bar
Max Pilot Pressure
250 bar
Max Pilot Return Pressure (y)
160 bar (AC)
Max Pressure (port T)
250 bar
Min Pilot Pressure
8.5 bar
Mounting Screws
6x M20 x 80 (ISO 4762)
Mounting Type
Subplate
Mttfd
100 years
Nominal Size
32 (NG32)
Pilot Volume (3-spool Spring-centered)
29.4 cm3
Porting Pattern
ISO 4401-10-09-0-05
Tightening Torque (m20)
340 Nm
1620 Old Apex Road
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