- The ET-S/C series heavy duty scotch yoke actuator are consisted of symmetrical and canted type and offer comlete modular system - By appling to double acting and spring return configuration, our compact ET-S/C series can be    suited for torque output of any valve such as ball, butterfly, plug valves and other quarter turn machanism - ET-S/C series are also designed to use with Hydraulic override, Limit switches, Solenoid valve and Positioner    by built-in air tubing at the factory