SMC先導式減壓閥的是一個圓盤形的蝶板,在閥體內繞其自身的軸線旋轉,從而達到啟閉或調節(jié)的閥門叫蝶閥。蝶閥全開到全關通常是小于90度　,蝶閥和蝶桿本身沒有自鎖有力,為了蝶板的定位,要在閥桿上加裝蝸輪減速器。采用蝸輪減速器,不僅可以使蝶板具有自鎖能力,使蝶板停止在任意位置上,還能改善閥門的操作性能。工業(yè)專用蝶閥的特點能耐高溫,適用壓力范圍也較高,閥門公稱通徑大,閥體采用碳鋼制造,閥板的密封圈采用金屬環(huán)代替橡膠環(huán)。大型高溫蝶閥采用鋼板焊接制造,主要用于高溫介質的煙風道和煤氣管道。 蝶閥優(yōu)點 蝶閥啟閉方便迅速、省力、流體阻力小,可以經常操作,結構簡單,體積小,重量輕,可以運送泥漿,在管道口積存液體少,低壓下,可以實現良好的密封,調節(jié)性能好, 蝶閥缺點蝶閥使用壓力和工作溫度范圍小,密封性較差,在安裝時,閥瓣要停在關閉的位置上,開啟位置應按蝶板的旋轉角度來確定,帶有旁通閥的蝶閥,開啟前應先打開旁通閥.

SMC先導式減壓閥的出廠時，調節(jié)彈簧處于未壓縮狀態(tài),此時主閥瓣和副閥瓣處于關閉狀態(tài),使用時按順時針轉動調節(jié)螺釘,壓縮調節(jié)彈簧,使膜瓣移頂開付閥瓣,介質由a孔通過付閥座到b孔進入活塞上方,活塞在介質壓力的作用下,向下移動推動主閥瓣離開主閥座,使介質流向閥后.同時由c孔進入膜片下方,當閥后壓力超過調定壓力時,推動膜片上移壓縮調節(jié)彈簧,付閥瓣隨之向關閉方向移動,使流入活塞上方的介質減小,壓力也隨之下降,此時的主閥瓣在主閥瓣彈簧力的推動上下移,使主閥瓣與主閥座的間隙減小,介質流量也隨之減小,使閥后壓力也隨之下降到新的平衡,反之當閥后壓力低于調定壓力時,主閥瓣與主閥座的間隙增大,介質流量也隨之增加,使閥后壓力也隨之增高達到新的平衡.
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