Structural principle of pneumatic actuator

Structural Principle:

The types and structures of adjustment mechanisms for pneumatic actuators are roughly the same, mainly due to differences in the execution mechanisms. Therefore, in the introduction of pneumatic actuators, there are two parts: the actuator and the regulating valve. The pneumatic actuator consists of two parts: the actuator and the regulating valve (regulating mechanism). According to the magnitude of the control signal, generate corresponding thrust and push the regulating valve to operate. The regulating valve is the regulating part of the pneumatic actuator. Under the action of the actuator thrust, the regulating valve produces a certain displacement or angle, directly regulating the flow rate of the fluid.

 

Working Principle:

When compressed air enters the pneumatic actuator from nozzle, the gas pushes the dual pistons to move in a straight line towards both ends (cylinder head end). The gear on the piston drives the gear on the rotating shaft to rotate counterclockwise by 90 degrees, and the valve is opened. At this time, the gas at both ends of the pneumatic actuator valve is discharged with the another nozzle. On the contrary, when compressed air enters the two ends of the pneumatic actuator from the another nozzle, the gas pushes the double plug to move in a straight line towards the middle. The gear 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 nozzle. The above is the standard transmission principle. According to user needs, pneumatic actuators can be installed with the opposite transmission principle to the standard type, that is, turning the shaft clockwise to open the valve and counterclockwise to close the valve. Single acting (spring return type) pneumatic actuator, nozzle is the air inlet, and another nozzle is the exhaust hole (silencer should be installed on nozzle). The inlet of nozzle is an open valve, which is closed by spring force when the air is cut off.