pneumatic actuator for butterfly valve/gate valve/ball valve
Actuator is an essential part of automatic control system. Its function is to accept the control signal sent by the controller, change the size of the controlled medium, so as to maintain the controlled variable in the required value or a certain range. Actuators can be divided into pneumatic, hydraulic and electric three categories according to their energy forms. Pneumatic actuator uses compressed air as energy, which is characterized by simple structure, reliable action, stable, large output thrust, convenient maintenance, fire and explosion-proof, and low price. Therefore, it is widely used in chemical industry, paper making, oil refining and other production processes. It can be easily used with passive instruments. Even when using electric meters or computer control, as long as the electric to gas converter or electric to gas valve positioner will convert the electrical signal into 20-100 kpa standard pressure signal, pneumatic actuator is still available. The electric actuator has convenient energy access and rapid signal transmission, but it has complex structure and poor explosion-proof performance. Hydraulic actuator is not used in chemical industry, oil refining and other production processes, which is characterized by high output thrust.