An actuator can be defined as a mechanism that moves or controls a device, such as a valve. Actuators eliminate the need for operators to go to every valve that needs repositioning and operate it by hand. When actuators are used, valves can be repositioned from a central location, such as a control room. This is very important in processes where many valves have to be repositioned accurately and quickly. This course will focus on the design and operation of pneumatic actuators.
