The working principle of the pneumatic actuator:
When the compressed air enters the pneumatic actuator from the A pipe nozzle, the gas pushes the double pistons to move linearly towards both ends (cylinder head end), and the piston moves up The rack 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 execution valve is discharged with the B nozzle.
On the contrary, when the compressed air enters both ends of the pneumatic actuator from the B nozzle, the gas pushes the double plugs to move linearly toward the middle, and the rack on the piston drives the gear on the rotating shaft to rotate 90 degrees clockwise. degree, the valve is closed. At this time, the gas in the middle of the pneumatic actuator is discharged with the A pipe nozzle.
The above is the standard transmission principle. According to the user's needs, the pneumatic actuator can be installed with the opposite transmission principle to the standard type, that is, the selected axis rotates clockwise to open the valve, and rotates counterclockwise to close the valve. The single-acting (spring return type) pneumatic actuator has nozzle A as the air inlet and nozzle B as the exhaust hole (nozzle B should be installed with a silencer). Nozzle A opens the valve for air inlet. When the air is cut off, the valve is closed by spring force.
Pneumatic actuators are commonly known as pneumatic heads, also known as pneumatic actuators (English: Pneumatic actuator). Actuators are divided into three categories: pneumatic, electric and hydraulic according to their energy forms. They each have their own characteristics and are suitable for different applications. occasion. Pneumatic actuators are a category of actuators. Pneumatic actuators can also be divided into two types: single-acting and double-acting: the switching actions of the actuator are driven by the air source, which is called DOUBLE ACTING (double-acting). The SPRINGRETURN (single-acting) actuator is only driven by air when opening or closing, and the opposite action is returned by a spring.