2、 Operating principle of pneumatic actuator:
1. When the compressed air enters the pneumatic actuator from nozzle A, the gas pushes the double pistons to move in a straight line towards both ends (cylinder head end). The rack on the piston drives the gear on the rotating shaft to rotate 90 degrees counterclockwise, and the valve is opened. At this time, the gas at both ends of the pneumatic actuator valve is discharged with nozzle B. On the contrary, when the compressed air enters both ends of the pneumatic actuator from the nozzle B, the gas pushes the double plug to move in a straight line in the middle. The rack on the piston drives the gear on the rotating shaft to rotate 90 degrees clockwise, and the valve is closed. At this time, the gas in the middle of the pneumatic actuator is discharged with nozzle A. The above is the transmission principle of the standard type. According to the user's needs, the pneumatic actuator can be installed in the opposite transmission principle to the standard type, that is, the valve is opened when the alignment shaft rotates clockwise, and closed when it rotates counterclockwise. Single acting (spring return type) pneumatic actuator nozzle A is the air inlet, nozzle B is the exhaust hole (nozzle B should be equipped with a muffler). The air inlet of nozzle A is to open the valve, and the valve is closed by spring force when the air is cut off.
2. The single action here means that the cylinder is reset with a spring. When gas failure or power failure occurs, the valve is reset by the spring in the cylinder to close or open the valve. (Normally closed or normally open optional). Double acting means that the cylinder is opened and closed by compressed air.

Third, the light industry mainly depends on the automatic control system of the light industry, especially the pneumatic high-pressure ball valve products, because no matter what kind of production line, the light industry will have an automatic control system with a very high degree of intelligence and work efficiency, It is also almost the only pneumatic high-pressure ball valve product that can be used better. Other valve products will appear out of place on the production line, and even frequent failures will affect the production status of the entire enterprise, which is a very uneconomical thing for enterprises.