控制和调节压缩空气流量的元件称为流量控制阀。改变和控制气流流动方向的元件称为方向控制阀。　除上述三类控制阀外，还有能实现一定逻辑功能的逻辑元件，包括元件内部无可动部件的射流元件和有可动部件的气动逻辑元件。在结构原理上，逻辑元件基本上和方向控制阀相同，仅仅是体积和通径较小，一般用来实现信号的逻辑运算功能。近年来，随着气动元件的小型化以及PLC控制在气动系统中的大量应用，气动逻辑元件的应用范围正在逐渐减小。 　从控制方式来分，气动控制可分为断续控制和连续控制两类。在断续控制系统中，通常要用压力控制阀、流量控制阀和方向控制阀来实现程序动作;连续控制系统中，除了要用压力、流量控制阀外，还要采用伺服、比例控制阀等，以便对系统进行连续控制。

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