Rated torque 12Nm to 4640Nm. Double acting type. ISO Mounting Design. Scotch-yoke mechanism which produces a torque curv that most closely match as the torque requirements of rotating valves . Manual handwheel option I-TORK pneumatic actuator ...... designed to operate rotating valves ; Ball valves, V-notch ball valves, Plug valves & Butterfly valves for control as well as on-off service.