上海滬工閥門廠（集團）有限公司

生產的系列蝶閥的(de)密封(feng)(feng)結(jie)構形式有：單偏(pian)心(xin)(xin)密封(feng)(feng)、雙偏(pian)心(xin)(xin)密封(feng)(feng)、三偏(pian)心(xin)(xin)密封(feng)(feng)、變偏(pian)心(xin)(xin)密封(feng)(feng)，各種結(jie)構類型蝶閥的(de)密封(feng)(feng)原理簡述如下(xia)：

1. 單偏(pian)心密封蝶閥的(de)密封原理(li)

由于(yu)在(zai)(zai)單偏心蝶(die)(die)閥(fa)(fa)(fa)的(de)(de)基(ji)礎上將蝶(die)(die)板(ban)的(de)(de)回轉(zhuan)中(zhong)心（既閥(fa)(fa)(fa)門(men)軸(zhou)中(zhong)心）與閥(fa)(fa)(fa)體中(zhong)心線(xian)形成尺寸偏置，使得蝶(die)(die)閥(fa)(fa)(fa)在(zai)(zai)開(kai)啟過程中(zhong)，蝶(die)(die)板(ban)的(de)(de)密(mi)(mi)封(feng)面(mian)會比單偏心密(mi)(mi)封(feng)蝶(die)(die)閥(fa)(fa)(fa)更(geng)快地脫離(li)閥(fa)(fa)(fa)座(zuo)(zuo)密(mi)(mi)封(feng)面(mian)，蝶(die)(die)板(ban)轉(zhuan)動至 8°~12° 時(shi)(shi)，蝶(die)(die)板(ban)密(mi)(mi)封(feng)面(mian)完全(quan)脫離(li)閥(fa)(fa)(fa)座(zuo)(zuo)密(mi)(mi)封(feng)，完全(quan)開(kai)啟時(shi)(shi)，兩(liang)密(mi)(mi)封(feng)面(mian)之間形成一個更(geng)大的(de)(de)間隙(xi)，該類蝶(die)(die)閥(fa)(fa)(fa)的(de)(de)設計，大大降低了兩(liang)密(mi)(mi)封(feng)面(mian)之間的(de)(de)機(ji)械磨損及擁擠壓變形，使蝶(die)(die)閥(fa)(fa)(fa)的(de)(de)密(mi)(mi)封(feng)性能更(geng)為提高。

2. 雙偏心密封(feng)蝶(die)閥的密封(feng)原理

由于在雙偏(pian)心(xin)蝶(die)閥(fa)(fa)(fa)(fa)的(de)基礎上將(jiang)閥(fa)(fa)(fa)(fa)座(zuo)中(zhong)心(xin)線再與閥(fa)(fa)(fa)(fa)體中(zhong)心(xin)線形成(cheng)一個 β 角偏(pian)置，使得蝶(die)閥(fa)(fa)(fa)(fa)在啟閥(fa)(fa)(fa)(fa)過程中(zhong)，蝶(die)板的(de)密封(feng)面在開啟瞬間(jian)立即(ji)脫離閥(fa)(fa)(fa)(fa)座(zuo)密封(feng)面，而在關(guan)閉瞬間(jian)才(cai)會接觸(chu)并壓(ya)緊閥(fa)(fa)(fa)(fa)座(zuo)密封(feng)面。當完全開啟時(shi)，兩密封(feng)面之間(jian)形成(cheng)一個與雙偏(pian)心(xin)密封(feng)蝶(die)閥(fa)(fa)(fa)(fa)相同的(de)間(jian)隙，該類(lei)蝶(die)閥(fa)(fa)(fa)(fa)的(de)設(she)計，徹(che)底(di)消除了(le)兩密封(feng)面之間(jian)的(de)機械磨損和擦傷，使蝶(die)閥(fa)(fa)(fa)(fa)的(de)密封(feng)性(xing)能和使用(yong)壽命都得到大大提高。

3. 變偏(pian)心密封蝶閥的(de)密封原理

變偏(pian)(pian)(pian)心(xin)蝶(die)(die)閥(fa)的(de)獨特(te)之(zhi)處在(zai)于安裝蝶(die)(die)板(ban)(ban)(ban)的(de)閥(fa)桿軸(zhou)(zhou)(zhou)(zhou)是一個三段(duan)(duan)軸(zhou)(zhou)(zhou)(zhou)式(shi)結(jie)構，此三段(duan)(duan)軸(zhou)(zhou)(zhou)(zhou)式(shi)閥(fa)桿兩(liang)段(duan)(duan)軸(zhou)(zhou)(zhou)(zhou)段(duan)(duan)同心(xin)，而(er)(er)中(zhong)心(xin)段(duan)(duan)軸(zhou)(zhou)(zhou)(zhou)中(zhong)心(xin)線與兩(liang)端(duan)軸(zhou)(zhou)(zhou)(zhou)線偏(pian)(pian)(pian)離(li)一個中(zhong)心(xin)距，蝶(die)(die)板(ban)(ban)(ban)就(jiu)安裝在(zai)中(zhong)間軸(zhou)(zhou)(zhou)(zhou)段(duan)(duan)上。這(zhe)樣的(de)偏(pian)(pian)(pian)心(xin)結(jie)構使得蝶(die)(die)板(ban)(ban)(ban)在(zai)全開位置(zhi)(zhi)時成為雙偏(pian)(pian)(pian)心(xin)狀(zhuang)(zhuang)，而(er)(er)在(zai)蝶(die)(die)板(ban)(ban)(ban)轉動到(dao)關閉(bi)位置(zhi)(zhi)時則成為單偏(pian)(pian)(pian)心(xin)狀(zhuang)(zhuang)。由于偏(pian)(pian)(pian)心(xin)軸(zhou)(zhou)(zhou)(zhou)的(de)作用(yong)，在(zai)接(jie)近關閉(bi)時，蝶(die)(die)板(ban)(ban)(ban)向閥(fa)座的(de)密封(feng)錐面(mian)內移進一個距離(li)，蝶(die)(die)板(ban)(ban)(ban)與閥(fa)座的(de)密封(feng)的(de)密封(feng)面(mian)相吻合達到(dao)可(ke)靠(kao)的(de)密封(feng)性能。

由于蝶(die)(die)板(ban)(ban)(ban)的回轉(zhuan)中(zhong)(zhong)心（即閥(fa)(fa)門(men)軸(zhou)中(zhong)(zhong)心）與(yu)蝶(die)(die)板(ban)(ban)(ban)密(mi)(mi)(mi)(mi)封(feng)(feng)截面(mian)(mian)按偏心設置，使得蝶(die)(die)閥(fa)(fa)在(zai)開(kai)啟(qi)過程中(zhong)(zhong)，蝶(die)(die)板(ban)(ban)(ban)密(mi)(mi)(mi)(mi)封(feng)(feng)面(mian)(mian)逐漸脫(tuo)離閥(fa)(fa)座(zuo)密(mi)(mi)(mi)(mi)封(feng)(feng)面(mian)(mian)，蝶(die)(die)板(ban)(ban)(ban)轉(zhuan)動至 20°~25° 時，蝶(die)(die)板(ban)(ban)(ban)密(mi)(mi)(mi)(mi)封(feng)(feng)面(mian)(mian)完全脫(tuo)離閥(fa)(fa)座(zuo)密(mi)(mi)(mi)(mi)封(feng)(feng)面(mian)(mian)，完全開(kai)啟(qi)時，兩密(mi)(mi)(mi)(mi)封(feng)(feng)面(mian)(mian)之(zhi)間形成間隙，從而使得蝶(die)(die)閥(fa)(fa)在(zai)啟(qi)閉過程中(zhong)(zhong)，兩密(mi)(mi)(mi)(mi)封(feng)(feng)面(mian)(mian)之(zhi)間相對機(ji)械磨(mo)損及擠壓大為降低，從而保證了蝶(die)(die)閥(fa)(fa)的密(mi)(mi)(mi)(mi)封(feng)(feng)。