劍閣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。在劍閣機械密封系(xi)(xi)(xi)(xi)統(tong)(tong)(tong)中，上述系(xi)(xi)(xi)(xi)統(tong)(tong)(tong)并不(bu)同時包(bao)括在(zai)內。密(mi)(mi)(mi)封(feng)(feng)系(xi)(xi)(xi)(xi)統(tong)(tong)(tong)的(de)選(xuan)擇主(zhu)(zhu)(zhu)要取(qu)決(jue)于(yu)主(zhu)(zhu)(zhu)密(mi)(mi)(mi)封(feng)(feng)件的(de)應(ying)用(yong)范圍。例如，如果主(zhu)(zhu)(zhu)密(mi)(mi)(mi)封(feng)(feng)用(yong)于(yu)高溫(wen)液體(ti)，密(mi)(mi)(mi)封(feng)(feng)系(xi)(xi)(xi)(xi)統(tong)(tong)(tong)應(ying)確(que)(que)保(bao)(bao)降(jiang)(jiang)低主(zhu)(zhu)(zhu)密(mi)(mi)(mi)封(feng)(feng)的(de)環(huan)境溫(wen)度，即采(cai)用(yong)溫(wen)度控制(zhi)(zhi)系(xi)(xi)(xi)(xi)統(tong)(tong)(tong)。如果主(zhu)(zhu)(zhu)密(mi)(mi)(mi)封(feng)(feng)用(yong)于(yu)固體(ti)雜(za)質含量高的(de)工(gong)作(zuo)介質，密(mi)(mi)(mi)封(feng)(feng)系(xi)(xi)(xi)(xi)統(tong)(tong)(tong)應(ying)確(que)(que)保(bao)(bao)在(zai)主(zhu)(zhu)(zhu)密(mi)(mi)(mi)封(feng)(feng)前降(jiang)(jiang)低固體(ti)雜(za)質含量，即采(cai)用(yong)除雜(za)系(xi)(xi)(xi)(xi)統(tong)(tong)(tong)。在(zai)腐蝕性(xing)介質中，密(mi)(mi)(mi)封(feng)(feng)系(xi)(xi)(xi)(xi)統(tong)(tong)(tong)必須確(que)(que)保(bao)(bao)主(zhu)(zhu)(zhu)密(mi)(mi)(mi)封(feng)(feng)降(jiang)(jiang)低腐蝕速率或消除腐蝕，即使用(yong)流(liu)體(ti)而不(bu)是堵塞流(liu)體(ti)系(xi)(xi)(xi)(xi)統(tong)(tong)(tong)；在(zai)高壓密(mi)(mi)(mi)封(feng)(feng)裝置(zhi)中，輔助系(xi)(xi)(xi)(xi)統(tong)(tong)(tong)應(ying)確(que)(que)保(bao)(bao)多(duo)級降(jiang)(jiang)壓和其他(ta)措(cuo)施，即壓力控制(zhi)(zhi)系(xi)(xi)(xi)(xi)統(tong)(tong)(tong)。

　　劍閣機械密封的三(san)個主要功能如下：

　　1、沖洗功能，沖洗是劍閣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。一般的劍閣機械密封應該沖(chong)洗(xi)，特(te)別是對于(yu)輕烴泵，沖(chong)洗(xi)時達到隔離介質、冷卻(que)和改(gai)善潤(run)滑的目的。隔離介質的目的可以通過將與介質相容的液體(ti)引入密封腔進(jin)行外部循環沖(chong)洗(xi)來實現(xian)。

　　2、除雜和過濾功能，密封流體中的微細固體粒子、污垢等雜質對劍閣機械密封造成(cheng)的(de)(de)危害非常嚴重，可(ke)能導致密(mi)(mi)封(feng)(feng)端面的(de)(de)磨損，也(ye)可(ke)能堵塞寒冷密(mi)(mi)封(feng)(feng)系統的(de)(de)管線。密(mi)(mi)封(feng)(feng)性(xing)系統軟件(jian)具(ju)有去除殘(can)(can)渣(zha)(zha)、保(bao)持液(ye)體清潔的(de)(de)作用(yong)(yong)(yong)。當殘(can)(can)渣(zha)(zha)的(de)(de)相對(dui)密(mi)(mi)度小(xiao)于(yu)液(ye)體媒質(zhi)相對(dui)密(mi)(mi)度時，能用(yong)(yong)(yong)過濾(lv)裝置去除殘(can)(can)渣(zha)(zha)；而當殘(can)(can)渣(zha)(zha)的(de)(de)相對(dui)密(mi)(mi)度超過液(ye)體媒質(zhi)相對(dui)密(mi)(mi)度時，可(ke)選(xuan)用(yong)(yong)(yong)旋液(ye)分離設(she)備或(huo)網式過濾(lv)器去除殘(can)(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。借助劍閣機械密封可以用雙端劍閣機械密封代替密(mi)(mi)封介質，將難以直接密(mi)(mi)封的介質轉化(hua)為(wei)密(mi)(mi)封潤滑性能好、清潔的密(mi)(mi)封液體介質。