Electric actuators are regulator motors that are used for measurement and control applications. The actuator is always connected in a closed regulator loop, with speed feedback and most often with position feedback. In the case of actuators, the most important are their control parameters, especially the speed and accuracy of the required control. Another important aspect is their reliability and mechanical design. The actuators find use of two-way, three-way and four-way valves, ball valves, air flaps and shut-off flaps, electric motors perform their work reliably and can be controlled remotely with maximum accuracy. We also appreciate the advantages of motorized actuators when regulating equithermal regulators and controlling lift valves. There are plentiful choices and the products of the proven companies Belimo, Siemens and others have a tradition and good sound among the actuators.