The hydraulically actuated 3/2 directional spool valve WKH10C is a direct- acting cartridge valve. In de-energized mode it permits a flow from port 3 to 4 and in reverse direction while port 2 is blocked. When the valve is hydraulically operated, i.e., when there is an increase in pressure at port 1 against the spring force, the valve permits flow from port 2 to 3 while port 4 is blocked. . Cavity UNF 7/8-14. Qmax = 10 l/min Pmax = 50 bar