Pneumatic actuator structure and principle

Pneumatic actuators (commonly known as pneumatic head is also called the pneumatic actuators English: Pneumatic physical)
actuators according to its energy form can be divided into pneumatic, electric and hydraulic three categories, each with characteristics, suitable for different occasions. Pneumatic actuators is a category of actuators.
pneumatic actuators can be divided into two types of single and DOUBLE action: switch actuator actions are carried out through the air to drive, called DOUBLE ACTING ( Dual role) 。 春天
返回( Single-acting) Switch action only open action is air driven, and close the action is a spring return. Pneumatic actuators profile
pneumatic actuators actuators and regulating mechanism is unified whole, the actuator diaphragm, piston, fork type and gear rack type. Piston stroke length, suitable for a greater thrust required; The diaphragm stroke is small, can only be direct drive valve stem. Fork type pneumatic instruments have torque, the space is little, torque curve more accord with the valve torque curve etc, but not very beautiful; Commonly used on large torque of the valve. Gear rack type actuator has a simple structure, stable and reliable, and safe explosion-proof, etc, in power plant, chemical industry, oil refining, etc to higher safety requirements have wide application in production.