Pneumatic actuators are actuators that use air pressure to drive valves to open and close or adjust valves. They are also called pneumatic actuators or pneumatic devices, but they are often called pneumatic heads. The actuator and adjustment mechanism of the pneumatic actuator are a unified whole, the actuator has a diaphragm type, a piston type, a fork type and a rack and pinion type.
The piston type has a long stroke and is suitable for occasions that require greater thrust; while the diaphragm type has a smaller stroke and can only directly drive the valve stem. Fork pneumatic actuator has the characteristics of large torque and small space, and the torque curve is more in line with the torque curve of the valve, but it is not very beautiful; it is often used on high torque valves. The rack and pinion pneumatic actuator has the advantages of simple structure, stable and reliable action, safety and explosion-proof. It is widely used in production processes with high safety requirements such as power plants, chemical industries, and oil refining.