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There are three situations where pneumatic actuators are used:

1.There is a standard one-way pneumatic valve combination on the moving line to complete the control logic function;

Second,some components without moving parts are used in the gas pipeline,and these components are switched on and off depending on the characteristics of the gas flowing through;

Third,the motion logic control system adopts modular built-in diaphragm,winding or sleeve type.All three pneumatic components use compressed air as the power to transmit signals or actuate mechanisms.In the factory,because compressed air is easily available,clean,pollution-free,safe,and the control function and design are very simple,many production lines now use pneumatic tools.

有三种情形用到气动执行机构：

一，运动的线路上有标准的单向气动阀门组合来完成控制逻辑功能;

二，在气体管道中采用一些没有移动部件的元件，这些元件是依靠流过的气体的特性而进行开关动作的;

三，运动的逻辑控制系统，采用模块化的内置隔膜、绕线或套筒式。这三种气动元件都是采用压缩空气作为传输信号或执行机制的动力。在工厂中，由于压缩空气容易获得，干净、无污染，又安全，控制的功能和设计都十分简单，因此，现在许多生产线上采用气动工具。