ABB RHD500 Electrical rotary actuator, V68163-0112-374-278-344 Rated torque 500 Nm (400 lbf-ft).Compact actuator for the operation of final control elements with rotary movement such as valve flaps, ball valves, etc. The torque is transferred via a lever-type actuator or the actuator is directly coupled to the shaft of the final control element._x000D_ The actuator is controlled using a Contrac electronic unit._x000D_ This electronic unit serves as the interface between the actuator and the control system._x000D_ During continuous positioning, the electronic unit varies the motor torque steplessly until the actuator force and the control valve force are balanced. High response sensitivity and high positioning accuracy with short positioning time ensure an excellent control quality and a long actuator life.