臨渭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。在臨渭機械密封系(xi)(xi)統(tong)(tong)(tong)(tong)中(zhong)，上述系(xi)(xi)統(tong)(tong)(tong)(tong)并(bing)不同時包括(kuo)在(zai)(zai)內。密(mi)(mi)(mi)(mi)封(feng)(feng)系(xi)(xi)統(tong)(tong)(tong)(tong)的(de)選擇主(zhu)(zhu)要取決(jue)于(yu)(yu)主(zhu)(zhu)密(mi)(mi)(mi)(mi)封(feng)(feng)件的(de)應(ying)用(yong)范圍。例如，如果(guo)(guo)主(zhu)(zhu)密(mi)(mi)(mi)(mi)封(feng)(feng)用(yong)于(yu)(yu)高溫液體(ti)(ti)，密(mi)(mi)(mi)(mi)封(feng)(feng)系(xi)(xi)統(tong)(tong)(tong)(tong)應(ying)確保降(jiang)低主(zhu)(zhu)密(mi)(mi)(mi)(mi)封(feng)(feng)的(de)環境溫度，即(ji)采用(yong)溫度控(kong)制(zhi)系(xi)(xi)統(tong)(tong)(tong)(tong)。如果(guo)(guo)主(zhu)(zhu)密(mi)(mi)(mi)(mi)封(feng)(feng)用(yong)于(yu)(yu)固(gu)體(ti)(ti)雜質含(han)量(liang)高的(de)工作介質，密(mi)(mi)(mi)(mi)封(feng)(feng)系(xi)(xi)統(tong)(tong)(tong)(tong)應(ying)確保在(zai)(zai)主(zhu)(zhu)密(mi)(mi)(mi)(mi)封(feng)(feng)前(qian)降(jiang)低固(gu)體(ti)(ti)雜質含(han)量(liang)，即(ji)采用(yong)除雜系(xi)(xi)統(tong)(tong)(tong)(tong)。在(zai)(zai)腐蝕性(xing)介質中(zhong)，密(mi)(mi)(mi)(mi)封(feng)(feng)系(xi)(xi)統(tong)(tong)(tong)(tong)必須確保主(zhu)(zhu)密(mi)(mi)(mi)(mi)封(feng)(feng)降(jiang)低腐蝕速率(lv)或消除腐蝕，即(ji)使用(yong)流體(ti)(ti)而不是堵塞流體(ti)(ti)系(xi)(xi)統(tong)(tong)(tong)(tong)；在(zai)(zai)高壓密(mi)(mi)(mi)(mi)封(feng)(feng)裝(zhuang)置中(zhong)，輔助系(xi)(xi)統(tong)(tong)(tong)(tong)應(ying)確保多級降(jiang)壓和(he)其他(ta)措施，即(ji)壓力控(kong)制(zhi)系(xi)(xi)統(tong)(tong)(tong)(tong)。

　　臨渭機械密封的三個主要功能如下：

　　1、沖洗功能，沖洗是臨渭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。一般的臨渭機械密封應該沖(chong)洗，特(te)別是對于輕烴泵，沖(chong)洗時達(da)到隔離介(jie)質(zhi)、冷卻和改善潤滑的(de)(de)目(mu)的(de)(de)。隔離介(jie)質(zhi)的(de)(de)目(mu)的(de)(de)可以通(tong)過將與(yu)介(jie)質(zhi)相容的(de)(de)液(ye)體引入密封腔進(jin)行外部循環沖(chong)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、污垢等雜質對臨渭機械密封造成(cheng)的危害非常嚴(yan)重(zhong)，可(ke)能(neng)導致密(mi)(mi)封端面的磨(mo)損，也(ye)可(ke)能(neng)堵塞寒冷(leng)密(mi)(mi)封系統的管線(xian)。密(mi)(mi)封性(xing)系統軟件具(ju)有去除殘(can)渣(zha)、保持液體清潔的作用。當殘(can)渣(zha)的相(xiang)(xiang)(xiang)對密(mi)(mi)度小(xiao)于液體媒(mei)質相(xiang)(xiang)(xiang)對密(mi)(mi)度時，能(neng)用過(guo)濾裝置去除殘(can)渣(zha)；而當殘(can)渣(zha)的相(xiang)(xiang)(xiang)對密(mi)(mi)度超過(guo)液體媒(mei)質相(xiang)(xiang)(xiang)對密(mi)(mi)度時，可(ke)選(xuan)用旋液分(fen)離(li)設備或網式過(guo)濾器去除殘(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。借助臨渭機械密封可以用雙端臨渭機械密封代(dai)替密(mi)封(feng)介(jie)質(zhi)，將(jiang)難(nan)以直接密(mi)封(feng)的(de)介(jie)質(zhi)轉化為密(mi)封(feng)潤滑性能好(hao)、清(qing)潔的(de)密(mi)封(feng)液體介(jie)質(zhi)。