中陽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。在中陽機械密封系(xi)統(tong)(tong)(tong)(tong)中(zhong)，上述(shu)系(xi)統(tong)(tong)(tong)(tong)并不同(tong)時包括在內。密(mi)(mi)(mi)封(feng)(feng)(feng)(feng)系(xi)統(tong)(tong)(tong)(tong)的(de)選擇主要取決(jue)于(yu)主密(mi)(mi)(mi)封(feng)(feng)(feng)(feng)件的(de)應(ying)用(yong)(yong)范圍(wei)。例如，如果(guo)主密(mi)(mi)(mi)封(feng)(feng)(feng)(feng)用(yong)(yong)于(yu)高溫(wen)液體(ti)(ti)，密(mi)(mi)(mi)封(feng)(feng)(feng)(feng)系(xi)統(tong)(tong)(tong)(tong)應(ying)確(que)保(bao)(bao)(bao)降(jiang)(jiang)低主密(mi)(mi)(mi)封(feng)(feng)(feng)(feng)的(de)環境溫(wen)度(du)，即采(cai)用(yong)(yong)溫(wen)度(du)控制(zhi)系(xi)統(tong)(tong)(tong)(tong)。如果(guo)主密(mi)(mi)(mi)封(feng)(feng)(feng)(feng)用(yong)(yong)于(yu)固體(ti)(ti)雜(za)(za)(za)質含量高的(de)工(gong)作介質，密(mi)(mi)(mi)封(feng)(feng)(feng)(feng)系(xi)統(tong)(tong)(tong)(tong)應(ying)確(que)保(bao)(bao)(bao)在主密(mi)(mi)(mi)封(feng)(feng)(feng)(feng)前(qian)降(jiang)(jiang)低固體(ti)(ti)雜(za)(za)(za)質含量，即采(cai)用(yong)(yong)除(chu)雜(za)(za)(za)系(xi)統(tong)(tong)(tong)(tong)。在腐蝕(shi)(shi)性介質中(zhong)，密(mi)(mi)(mi)封(feng)(feng)(feng)(feng)系(xi)統(tong)(tong)(tong)(tong)必須(xu)確(que)保(bao)(bao)(bao)主密(mi)(mi)(mi)封(feng)(feng)(feng)(feng)降(jiang)(jiang)低腐蝕(shi)(shi)速率或消(xiao)除(chu)腐蝕(shi)(shi)，即使用(yong)(yong)流(liu)體(ti)(ti)而不是堵(du)塞流(liu)體(ti)(ti)系(xi)統(tong)(tong)(tong)(tong)；在高壓(ya)(ya)密(mi)(mi)(mi)封(feng)(feng)(feng)(feng)裝置中(zhong)，輔助系(xi)統(tong)(tong)(tong)(tong)應(ying)確(que)保(bao)(bao)(bao)多級降(jiang)(jiang)壓(ya)(ya)和其他措(cuo)施(shi)，即壓(ya)(ya)力控制(zhi)系(xi)統(tong)(tong)(tong)(tong)。

　　中陽機械密封的(de)三個主(zhu)要功能(neng)如下(xia)：

　　1、沖洗功能，沖洗是中陽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。一般的中陽機械密封應該(gai)沖洗(xi)，特別是(shi)對于輕烴泵，沖洗(xi)時達到(dao)隔離介質(zhi)、冷卻和(he)改(gai)善潤滑的(de)目的(de)。隔離介質(zhi)的(de)目的(de)可以通過將與介質(zhi)相容的(de)液體引入密(mi)封腔進行外部循(xun)環沖洗(xi)來實現。

　　2、除雜和過濾功能，密封流體中的微細固體粒子、污垢等雜質對中陽機械密封造(zao)成的(de)危害非常(chang)嚴重，可(ke)能(neng)導致密(mi)封(feng)端面的(de)磨(mo)損，也可(ke)能(neng)堵塞(sai)寒(han)冷密(mi)封(feng)系統(tong)的(de)管線(xian)。密(mi)封(feng)性系統(tong)軟件(jian)具有去除(chu)(chu)殘(can)渣(zha)、保持液體清(qing)潔的(de)作用。當(dang)殘(can)渣(zha)的(de)相(xiang)對(dui)密(mi)度(du)(du)小于液體媒(mei)質(zhi)相(xiang)對(dui)密(mi)度(du)(du)時(shi)，能(neng)用過濾(lv)裝置去除(chu)(chu)殘(can)渣(zha)；而(er)當(dang)殘(can)渣(zha)的(de)相(xiang)對(dui)密(mi)度(du)(du)超過液體媒(mei)質(zhi)相(xiang)對(dui)密(mi)度(du)(du)時(shi)，可(ke)選(xuan)用旋液分離設備或網式過濾(lv)器(qi)去除(chu)(chu)殘(can)渣(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。借助中陽機械密封可以用雙端中陽機械密封代替密(mi)(mi)封(feng)(feng)介質(zhi)，將難以(yi)直接密(mi)(mi)封(feng)(feng)的(de)介質(zhi)轉化(hua)為密(mi)(mi)封(feng)(feng)潤滑性(xing)能好、清潔的(de)密(mi)(mi)封(feng)(feng)液體介質(zhi)。