Damper Actuator is a motor-operated rotary actuator in which speed reducer, motor, limit switches, overload switches, opening transmitter and manual handling mechanism are united. Damper Actuator can operate the damper or valve by remote control under the bad conditions such as high place, high temperature and much dust. Widely used in iron ＆ steel, cement, non-ferrous metal and electric power plants with its feature of easy maintenance and high reliability.