卓尼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。在卓尼機械密封系(xi)(xi)(xi)統(tong)(tong)(tong)(tong)(tong)中(zhong)，上述(shu)系(xi)(xi)(xi)統(tong)(tong)(tong)(tong)(tong)并不同時包括在內。密(mi)封(feng)(feng)(feng)(feng)(feng)系(xi)(xi)(xi)統(tong)(tong)(tong)(tong)(tong)的(de)選(xuan)擇主(zhu)(zhu)(zhu)要取決于(yu)(yu)主(zhu)(zhu)(zhu)密(mi)封(feng)(feng)(feng)(feng)(feng)件的(de)應(ying)(ying)用(yong)范圍(wei)。例如(ru)(ru)，如(ru)(ru)果主(zhu)(zhu)(zhu)密(mi)封(feng)(feng)(feng)(feng)(feng)用(yong)于(yu)(yu)高(gao)溫液(ye)體(ti)，密(mi)封(feng)(feng)(feng)(feng)(feng)系(xi)(xi)(xi)統(tong)(tong)(tong)(tong)(tong)應(ying)(ying)確(que)保降(jiang)(jiang)低(di)(di)主(zhu)(zhu)(zhu)密(mi)封(feng)(feng)(feng)(feng)(feng)的(de)環境溫度，即(ji)(ji)采(cai)用(yong)溫度控(kong)制系(xi)(xi)(xi)統(tong)(tong)(tong)(tong)(tong)。如(ru)(ru)果主(zhu)(zhu)(zhu)密(mi)封(feng)(feng)(feng)(feng)(feng)用(yong)于(yu)(yu)固體(ti)雜(za)質(zhi)含(han)量(liang)高(gao)的(de)工作(zuo)介質(zhi)，密(mi)封(feng)(feng)(feng)(feng)(feng)系(xi)(xi)(xi)統(tong)(tong)(tong)(tong)(tong)應(ying)(ying)確(que)保在主(zhu)(zhu)(zhu)密(mi)封(feng)(feng)(feng)(feng)(feng)前降(jiang)(jiang)低(di)(di)固體(ti)雜(za)質(zhi)含(han)量(liang)，即(ji)(ji)采(cai)用(yong)除雜(za)系(xi)(xi)(xi)統(tong)(tong)(tong)(tong)(tong)。在腐(fu)(fu)蝕(shi)性介質(zhi)中(zhong)，密(mi)封(feng)(feng)(feng)(feng)(feng)系(xi)(xi)(xi)統(tong)(tong)(tong)(tong)(tong)必須確(que)保主(zhu)(zhu)(zhu)密(mi)封(feng)(feng)(feng)(feng)(feng)降(jiang)(jiang)低(di)(di)腐(fu)(fu)蝕(shi)速率或消除腐(fu)(fu)蝕(shi)，即(ji)(ji)使用(yong)流(liu)體(ti)而不是堵塞流(liu)體(ti)系(xi)(xi)(xi)統(tong)(tong)(tong)(tong)(tong)；在高(gao)壓(ya)密(mi)封(feng)(feng)(feng)(feng)(feng)裝置中(zhong)，輔助系(xi)(xi)(xi)統(tong)(tong)(tong)(tong)(tong)應(ying)(ying)確(que)保多級降(jiang)(jiang)壓(ya)和其(qi)他措(cuo)施(shi)，即(ji)(ji)壓(ya)力(li)控(kong)制系(xi)(xi)(xi)統(tong)(tong)(tong)(tong)(tong)。

　　卓尼機械密封的(de)三個主要功能如(ru)下：

　　1、沖洗功能，沖洗是卓尼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。一般的卓尼機械密封應該(gai)沖洗，特別是對于輕(qing)烴泵(beng)，沖洗時達到隔(ge)離介質、冷卻和改善潤(run)滑(hua)的(de)目的(de)。隔(ge)離介質的(de)目的(de)可(ke)以通過將與介質相容的(de)液體(ti)引入密(mi)封腔進行外部循環(huan)沖洗來實(shi)現(xian)。

　　2、除雜和過濾功能，密封流體中的微細固體粒子、污垢等雜質對卓尼機械密封造成的危害(hai)非常嚴重，可能(neng)導(dao)致密(mi)封端面的磨損，也(ye)可能(neng)堵塞(sai)寒冷密(mi)封系(xi)統(tong)的管線。密(mi)封性系(xi)統(tong)軟件具有(you)去除(chu)殘(can)渣、保持(chi)液(ye)體(ti)(ti)清潔的作用(yong)。當(dang)殘(can)渣的相對(dui)密(mi)度(du)小于(yu)液(ye)體(ti)(ti)媒質(zhi)相對(dui)密(mi)度(du)時，能(neng)用(yong)過濾裝置去除(chu)殘(can)渣；而當(dang)殘(can)渣的相對(dui)密(mi)度(du)超過液(ye)體(ti)(ti)媒質(zhi)相對(dui)密(mi)度(du)時，可選(xuan)用(yong)旋液(ye)分離(li)設備或網式(shi)過濾器去除(chu)殘(can)渣。

　　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。借助卓尼機械密封可以用雙端卓尼機械密封代替密封(feng)(feng)介(jie)質(zhi)，將(jiang)難以(yi)直接密封(feng)(feng)的介(jie)質(zhi)轉化(hua)為密封(feng)(feng)潤滑性能好、清潔的密封(feng)(feng)液(ye)體介(jie)質(zhi)。