SMC的速度控制阀分为两类，进气节流型和排气节流型；主要区别在于内部单向阀的方向不同。
进气节流型即在气源进入气缸的时候单向阀截止，通过限流螺母控制气流进入气缸，从而达到调速的目的，但由于单向阀排气时导通，所以，缺点是排气端基本没有背压，所以很容易出现活塞杆急速伸出的状态；
排气节流型即在气缸排气的时候单向阀截止，同样通过限流螺母控制气流排出，达到调速目的，排气节流的话，对排出气流有所限制，不会造成活塞杆急速伸出或缩回，这种方式一般比较保险，广泛应用在气路设计之中。
SMC速度控制阀在整个体系中是充当着相当重要的作用的，是一个谁也不可替代的重要的地位。SMC速度控制阀主要是根据空气以及气流的作用来对阀门进行的控制。
SMC 具有固定节流孔和急速供气机能的速度控制阀SSC（ASS）的使用注意1）SSC阀应安装在防止活塞杆急速伸出的供气侧，希望直接诶装在气缸上。若与气缸用配管连接，一旦配管长，不仅速度控制变差，在正常动作时，其始动作时间也变长，甚至速度控制不起作用。2）100mm以下短行程气缸及摆动气缸不要使用SSC阀。3）负载率在50%以下使用SSC阀，以免正常动作时的速度控制不起作用。4）排气节流控制的SSC阀，防止活塞杆急速伸出的初始速度是不可调节的，若希望低于初期速度且可调，则应选用进气节流控制的SSC阀（ASS110·310）。5）缸内有残压的回路，使用进气节流式的速度控制阀就能防止活塞杆急速伸出。
日本SMC速度控制阀、smc电磁阀
SMC速度控制阀的阀体材质为WCB/WC9，对于双阀系统中的启动阀要求抗气蚀，V级关闭等级，对于复合型给水阀需使用特性化阀内件同时满足锅炉启动与正常运行时的需要。一般阀门选择为故障关，(需要注意的是一般给水中为消除溶解其中的氧会加入联胺进行处理，它会对SALITE6号合金或其它的类似合金产生不良反应，所以不使用316 SLITE堆焊的方法处理阀内件，可直接选用416不锈钢材料)。
日本SMC速度控制阀、smc电磁阀
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