4WEH22G7X/6EW110N9TDAL CSA

The 4WEH22G7X/6EW110N9TDAL CSA valve is produced by Bosch Rexroth as part of the WEH Directional Spool Valves series. It directs pressurized oil to cylinders or motors in hydraulic automation cells. The unit is built in size NG25 (W.H 22), giving passage dimensions suited for medium-to-high flow circuits. A flow limit of 200 l/min at 280 bar under symbol G defines the maximum volume it can route without excessive pressure drop. The main ports P, A, and B tolerate continuous operating pressure up to 280 bar so the valve can serve high-force actuators. Subplate mounting simplifies installation and removal without disturbing pipework. The interface follows the ISO 4401-08-08-0-05 pattern, allowing the body to fit standard manifold blocks. A mounting face surface finish of Rzmax 4 µm promotes reliable seal contact and prevents external leakage.

Control of the main spool is handled by a 4WE6 6E high-power pilot valve, providing rapid shifting for demanding cycle times. The pilot supply is taken from an external line through port X, which keeps pilot pressure stable even when the main system pressure fluctuates. Exhaust from the pilot stage is routed internally to port T, eliminating the need for a separate drain hose. The pilot circuit accepts up to 210 bar, giving adequate force to overcome sticky loads, while a minimum of 10.5 bar is required to move the spring-centered spool from neutral. Fluid cleanliness must meet ISO 4406 class 20/18/15 to protect the precision lands from wear and maintain shift accuracy. Together these parameters support dependable directional control in automated hydraulic machinery.