SMC先導(dǎo)式減壓閥的是一個圓盤形的蝶板,在閥體內(nèi)繞其自身的軸線旋轉(zhuǎn),從而達(dá)到啟閉或調(diào)節(jié)的閥門叫蝶閥。蝶閥全開到全關(guān)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(zhì)的煙風(fēng)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(jīng)常操作,結(jié)構(gòu)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(xiàn)良好的密封,調(diào)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(guān)閉的位置上,開啟位置應(yīng)按蝶板的旋轉(zhuǎn)角度來確定,帶有旁通閥的蝶閥,開啟前應(yīng)先打開旁通閥.

SMC先導(dǎo)式減壓閥的出廠時，調(diào)節(jié)彈簧處于未壓縮狀態(tài),此時主閥瓣和副閥瓣處于關(guān)閉狀態(tài),使用時按順時針轉(zhuǎn)動調(diào)節(jié)螺釘,壓縮調(diào)節(jié)彈簧,使膜瓣移頂開付閥瓣,介質(zhì)由a孔通過付閥座到b孔進(jìn)入活塞上方,活塞在介質(zhì)壓力的作用下,向下移動推動主閥瓣離開主閥座,使介質(zhì)流向閥后.同時由c孔進(jìn)入膜片下方,當(dāng)閥后壓力超過調(diào)定壓力時,推動膜片上移壓縮調(diào)節(jié)彈簧,付閥瓣隨之向關(guān)閉方向移動,使流入活塞上方的介質(zhì)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(zhì)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(dāng)閥后壓力低于調(diào)定壓力時,主閥瓣與主閥座的間隙增大,介質(zhì)流量也隨之增加,使閥后壓力也隨之增高達(dá)到新的平衡.
AR425-04,SMC先導(dǎo)式減壓閥,SMC減壓閥

SMC AR425-02

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SMC AR5000-N06-X505

SMC AR500-10-3

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SMC AR50-06

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SMC AR50-10-X2117

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SMC AR5060-06

SMC AR5060-10

SMC AR50-F06

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SMC AR50-F06-1R

SMC AR50-F06BE-N

SMC AR50-F06E

SMC AR50-F06E-Y

SMC AR50-F06-Y

SMC AR50-F10

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SMC AR50K-06

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SMC AR50K-N06

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SMC AR50-N06-1NZ

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SMC AR50-N10

SMC AR50P-030

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SMC AR510-06-3

SMC AR510-06-3-X238

SMC AR510-06BG1-6

SMC AR510-10

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SMC AR510-10-3-X238

SMC AR52P-030

SMC AR52P-270AS

SMC AR6000-10

SMC AR6000-10-1

SMC AR6000-10-1R

SMC AR6000-10-N

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SMC AR610-10-3

SMC AR610-10BG1-6