The pneumatic actuator can be explosion-proof

Pneumatic actuator is an executive device that uses pneumatic pressure to drive the opening and closing or regulating valve. It is also called pneumatic actuator or pneumatic device, but it is commonly referred to as pneumatic head. The actuator and regulating mechanism of pneumatic actuator is a unified whole, and its actuator has membrane type, piston type, fork type and rack and pinion type.

 

To know that the pneumatic actuator can accept continuous pneumatic signal, output linear displacement, some with rocker arm, can output angular displacement. The moving speed is high, but the speed will be slow when the load increases. It has high reliability, but the valve can not be maintained after the gas source is interrupted (it can be maintained after adding the retaining valve), which is inconvenient to realize the sectional control and program control, and has the explosion-proof function.

 

When the compressed air enters the pneumatic actuator from the a pipe nozzle, the gas pushes the double piston to move in a straight line to both ends (cylinder head end). The rack on the piston drives the gear on the rotating shaft to rotate 90 degrees anticlockwise, and the valve is opened.

 

At this time, the gas at both ends of the pneumatic valve is discharged with the B pipe nozzle. On the contrary, when the compressed air enters the two ends of the pneumatic actuator from the B nozzle, 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 the a nozzle.

 

 

The above is the transmission principle of standard type. According to the user's demand, the pneumatic actuator can be installed in the opposite transmission principle with the standard type, that is, the valve is opened when the shaft is turned clockwise, and closed when the valve is turned anticlockwise.

 

For single acting (spring return) pneumatic actuator, nozzle a is air inlet and nozzle B is exhaust port (muffler should be installed at nozzle b). The inlet of nozzle a is to open the valve, and the valve is closed by spring force when air is cut off.