A series pneumatic actuator

Pneumatic actuators are actuators that use air pressure to drive opening and closing or adjusting valves. They are also called pneumatic actuators or pneumatic devices, but they are generally called pneumatic heads. Pneumatic actuators are sometimes equipped with certain auxiliary devices. Commonly used are valve positioners and handwheel mechanisms. The function of the valve positioner is to use the feedback principle to improve the performance of the actuator, so that the actuator can realize accurate positioning according to the control signal of the controller. The function of the handwheel mechanism is to use it to directly control the control valve to maintain the normal production when the control system is power outage, gas outage, no output from the controller or failure of the actuator.