群英鄉機械密封包括壓力控制、溫度控制、流體替換(堵塞)和雜質去除系統。在群英鄉機械密封系(xi)(xi)(xi)統(tong)(tong)(tong)(tong)中，上述(shu)系(xi)(xi)(xi)統(tong)(tong)(tong)(tong)并不同(tong)時(shi)包括在(zai)內。密(mi)(mi)封(feng)(feng)(feng)(feng)(feng)系(xi)(xi)(xi)統(tong)(tong)(tong)(tong)的(de)選擇主(zhu)要取決于主(zhu)密(mi)(mi)封(feng)(feng)(feng)(feng)(feng)件的(de)應用(yong)(yong)(yong)范圍。例(li)如(ru)，如(ru)果(guo)主(zhu)密(mi)(mi)封(feng)(feng)(feng)(feng)(feng)用(yong)(yong)(yong)于高(gao)(gao)溫(wen)液體(ti)(ti)，密(mi)(mi)封(feng)(feng)(feng)(feng)(feng)系(xi)(xi)(xi)統(tong)(tong)(tong)(tong)應確保降低主(zhu)密(mi)(mi)封(feng)(feng)(feng)(feng)(feng)的(de)環境溫(wen)度，即(ji)采用(yong)(yong)(yong)溫(wen)度控制(zhi)系(xi)(xi)(xi)統(tong)(tong)(tong)(tong)。如(ru)果(guo)主(zhu)密(mi)(mi)封(feng)(feng)(feng)(feng)(feng)用(yong)(yong)(yong)于固體(ti)(ti)雜質(zhi)含量高(gao)(gao)的(de)工作介(jie)質(zhi)，密(mi)(mi)封(feng)(feng)(feng)(feng)(feng)系(xi)(xi)(xi)統(tong)(tong)(tong)(tong)應確保在(zai)主(zhu)密(mi)(mi)封(feng)(feng)(feng)(feng)(feng)前降低固體(ti)(ti)雜質(zhi)含量，即(ji)采用(yong)(yong)(yong)除雜系(xi)(xi)(xi)統(tong)(tong)(tong)(tong)。在(zai)腐(fu)蝕性介(jie)質(zhi)中，密(mi)(mi)封(feng)(feng)(feng)(feng)(feng)系(xi)(xi)(xi)統(tong)(tong)(tong)(tong)必(bi)須確保主(zhu)密(mi)(mi)封(feng)(feng)(feng)(feng)(feng)降低腐(fu)蝕速率(lv)或(huo)消除腐(fu)蝕，即(ji)使用(yong)(yong)(yong)流(liu)體(ti)(ti)而不是堵塞(sai)流(liu)體(ti)(ti)系(xi)(xi)(xi)統(tong)(tong)(tong)(tong)；在(zai)高(gao)(gao)壓(ya)(ya)密(mi)(mi)封(feng)(feng)(feng)(feng)(feng)裝置中，輔助系(xi)(xi)(xi)統(tong)(tong)(tong)(tong)應確保多級降壓(ya)(ya)和其他措施，即(ji)壓(ya)(ya)力控制(zhi)系(xi)(xi)(xi)統(tong)(tong)(tong)(tong)。

　　群英鄉機械密封的(de)三(san)個主要功能如(ru)下：

　　1、沖洗功能，沖洗是群英鄉機械密封基本的功能，它直接將液體注入單面密封或雙面密封的高壓側。一般的群英鄉機械密封應該(gai)沖洗，特別是對(dui)于輕烴(jing)泵，沖洗時達(da)到(dao)隔離介(jie)質(zhi)(zhi)、冷卻和改善潤滑的(de)目的(de)。隔離介(jie)質(zhi)(zhi)的(de)目的(de)可以通過將與介(jie)質(zhi)(zhi)相(xiang)容的(de)液體引入密(mi)封腔(qiang)進(jin)行外(wai)部循環沖洗來實現(xian)。

　　2、除雜和過濾功能，密封流體中的微細固體粒子、污垢等雜質對群英鄉機械密封造成的危(wei)害非常嚴重，可(ke)能(neng)導致密(mi)(mi)封端面的磨損(sun)，也可(ke)能(neng)堵(du)塞寒(han)冷密(mi)(mi)封系(xi)統(tong)的管線。密(mi)(mi)封性(xing)系(xi)統(tong)軟件具(ju)有(you)去除(chu)殘(can)渣(zha)(zha)、保持液(ye)體(ti)(ti)清潔的作用。當殘(can)渣(zha)(zha)的相(xiang)對密(mi)(mi)度小(xiao)于液(ye)體(ti)(ti)媒(mei)質相(xiang)對密(mi)(mi)度時，能(neng)用過濾(lv)裝置(zhi)去除(chu)殘(can)渣(zha)(zha)；而(er)當殘(can)渣(zha)(zha)的相(xiang)對密(mi)(mi)度超過液(ye)體(ti)(ti)媒(mei)質相(xiang)對密(mi)(mi)度時，可(ke)選用旋液(ye)分離設備或網式(shi)過濾(lv)器去除(chu)殘(can)渣(zha)(zha)。

　　3、流體替代功能，含有固體顆粒的氣相介質和液相介質的直接密封難度很大，它們溫、毒、貴、易蒸發、易結晶。借助群英鄉機械密封可以用雙端群英鄉機械密封代替密封(feng)(feng)介(jie)質(zhi)，將難以直接密封(feng)(feng)的介(jie)質(zhi)轉化為密封(feng)(feng)潤(run)滑(hua)性(xing)能好、清潔的密封(feng)(feng)液體(ti)介(jie)質(zhi)。