SMC的速度控制閥分為兩類，進氣節流型和排氣節流型；主要區別在于內部單向閥的方向不同。
進氣節流型即在氣源進入氣缸的時候單向閥截止，通過限流螺母控制氣流進入氣缸，從而達到調速的目的，但由于單向閥排氣時導通，所以，缺點是排氣端基本沒有背壓，所以很容易出現活塞桿急速伸出的狀態；
排氣節流型即在氣缸排氣的時候單向閥截止，同樣通過限流螺母控制氣流排出，達到調速目的，排氣節流的話，對排出氣流有所限制，不會造成活塞桿急速伸出或縮回，這種方式一般比較保險，廣泛應用在氣路設計之中。
SMC速度控制閥在整個體系中是充當著相當重要的作用的，是一個誰也不可替代的重要的地位。SMC速度控制閥主要是根據空氣以及氣流的作用來對閥門進行的控制。
SMC 具有固定節流孔和急速供氣機能的速度控制閥SSC（ASS）的使用注意1）SSC閥應安裝在防止活塞桿急速伸出的供氣側，希望直接誒裝在氣缸上。若與氣缸用配管連接，一旦配管長，不僅速度控制變差，在正常動作時，其始動作時間也變長，甚至速度控制不起作用。2）100mm以下短行程氣缸及擺動氣缸不要使用SSC閥。3）負載率在50%以下使用SSC閥，以免正常動作時的速度控制不起作用。4）排氣節流控制的SSC閥，防止活塞桿急速伸出的初始速度是不可調節的，若希望低于初期速度且可調，則應選用進氣節流控制的SSC閥（ASS110·310）。5）缸內有殘壓的回路，使用進氣節流式的速度控制閥就能防止活塞桿急速伸出。

日本SMC速度控制閥、smc電磁閥

SMC速度控制閥的閥體材質為WCB/WC9，對于雙閥系統中的啟動閥要求抗氣蝕，V級關閉等級，對于復合型給水閥需使用特性化閥內件同時滿足鍋爐啟動與正常運行時的需要。一般閥門選擇為故障關，(需要注意的是一般給水中為消除溶解其中的氧會加入聯胺進行處理，它會對SALITE6號合金或其它的類似合金產生不良反應，所以不使用316 SLITE堆焊的方法處理閥內件，可直接選用416不銹鋼材料)。

日本SMC速度控制閥、smc電磁閥
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