Bosch Rexroth | 4WEH32HD6XOF6EW110N9SK4-CSA
4WEH32HD6X/OF6EW110N9SK4 CSA
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The 4WEH32HD6X/OF6EW110N9SK4 CSA directional spool valve belongs to the WEH Directional Spool Valves series from Bosch Rexroth. It directs pressurized fluid to actuators in hydraulic automation circuits that require rapid and reliable on-off control. The valve is produced in size NG32 so it fits manifolds designed for high flow blocks. Installation follows the ISO 4401-10-09-0-05 mounting pattern, and six M20 × 80 bolts secure the body to the subplate. Each screw must be tightened to 340 Nm to maintain seal integrity under load. A surface coating up to 100 µm resists corrosion in harsh plant environments, while proper operation is ensured when ambient temperature stays at or below 50 °C. System oil should meet cleanliness class 20/18/15 under ISO 4406 to protect the precision spool lands from abrasion.
For circuit design, the valve accommodates a maximum flow of 1100 l/min, yet when the HD spool is used at 350 bar the flow limit is 680 l/min to keep switching forces within design margins. The main ports withstand operating pressure up to 350 bar, and the pilot stage is rated for 250 bar so the control lines can share the same supply header. A two-spool H configuration functions with pilot pressure down to 5 bar, allowing low-pressure commissioning. The shortest switching sequence draws 45 l/min of pilot oil and displaces 58.8 cm³ per cycle, data necessary for sizing the pilot pump and return accumulator. Pilot return port Y may rise to 160 bar without impairing response, while port T tolerates back pressure up to 250 bar. These limits define compatibility with accumulator-loaded or counterbalance-restricted circuits.
Technical Specifications
Ambient Temperature Max
50 °C
Cleanliness Class (iso 4406)
20/18/15
Flow Limit (hd @350 Bar)
680 l/min
Max Flow
1100 l/min
Max Operating Pressure
350 bar
Max Pilot Pressure
250 bar
Min Pilot Pressure (2-spool, H)
5 bar
Mounting Pattern
ISO 4401-10-09-0-05
Mounting Screws
6x M20 x 80
Pilot Flow (shortest Switching)
45 l/min
Pilot Return Y Max (ac)
160 bar
Pilot Volume Per Switching (2-spool)
58.8 cm3
Port T Max Pressure
250 bar
Screw Tightening Torque
340 Nm
Size
NG32
Surface Coating Max Thickness
100 µm
1620 Old Apex Road
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