原平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。在原平機械密封系(xi)統(tong)(tong)(tong)(tong)(tong)(tong)(tong)中(zhong)，上述系(xi)統(tong)(tong)(tong)(tong)(tong)(tong)(tong)并不(bu)同(tong)時包括(kuo)在(zai)(zai)內。密(mi)(mi)封(feng)(feng)(feng)系(xi)統(tong)(tong)(tong)(tong)(tong)(tong)(tong)的選擇主(zhu)要取決于主(zhu)密(mi)(mi)封(feng)(feng)(feng)件的應用(yong)范圍。例(li)如，如果主(zhu)密(mi)(mi)封(feng)(feng)(feng)用(yong)于高(gao)溫液體(ti)，密(mi)(mi)封(feng)(feng)(feng)系(xi)統(tong)(tong)(tong)(tong)(tong)(tong)(tong)應確保(bao)降(jiang)低(di)主(zhu)密(mi)(mi)封(feng)(feng)(feng)的環境溫度(du)，即采(cai)用(yong)溫度(du)控(kong)制系(xi)統(tong)(tong)(tong)(tong)(tong)(tong)(tong)。如果主(zhu)密(mi)(mi)封(feng)(feng)(feng)用(yong)于固體(ti)雜質含量高(gao)的工作介質，密(mi)(mi)封(feng)(feng)(feng)系(xi)統(tong)(tong)(tong)(tong)(tong)(tong)(tong)應確保(bao)在(zai)(zai)主(zhu)密(mi)(mi)封(feng)(feng)(feng)前降(jiang)低(di)固體(ti)雜質含量，即采(cai)用(yong)除雜系(xi)統(tong)(tong)(tong)(tong)(tong)(tong)(tong)。在(zai)(zai)腐蝕(shi)性介質中(zhong)，密(mi)(mi)封(feng)(feng)(feng)系(xi)統(tong)(tong)(tong)(tong)(tong)(tong)(tong)必須確保(bao)主(zhu)密(mi)(mi)封(feng)(feng)(feng)降(jiang)低(di)腐蝕(shi)速率(lv)或消除腐蝕(shi)，即使用(yong)流(liu)體(ti)而不(bu)是(shi)堵塞流(liu)體(ti)系(xi)統(tong)(tong)(tong)(tong)(tong)(tong)(tong)；在(zai)(zai)高(gao)壓(ya)密(mi)(mi)封(feng)(feng)(feng)裝置中(zhong)，輔助系(xi)統(tong)(tong)(tong)(tong)(tong)(tong)(tong)應確保(bao)多級降(jiang)壓(ya)和其他措施(shi)，即壓(ya)力控(kong)制系(xi)統(tong)(tong)(tong)(tong)(tong)(tong)(tong)。

　　原平機械密封的(de)三個主要功能如下：

　　1、沖洗功能，沖洗是原平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。一般的原平機械密封應該(gai)沖洗，特(te)別(bie)是(shi)對于輕(qing)烴泵，沖洗時達到隔離(li)介(jie)質(zhi)、冷卻和改善潤(run)滑的目的。隔離(li)介(jie)質(zhi)的目的可以通過(guo)將(jiang)與(yu)介(jie)質(zhi)相容的液(ye)體引入密封腔進行外部循(xun)環沖洗來(lai)實現。

　　2、除雜和過濾功能，密封流體中的微細固體粒子、污垢等雜質對原平機械密封造成的(de)(de)危害非常嚴重，可能導致密(mi)(mi)(mi)(mi)封端(duan)面的(de)(de)磨損，也可能堵塞(sai)寒(han)冷密(mi)(mi)(mi)(mi)封系統(tong)的(de)(de)管線。密(mi)(mi)(mi)(mi)封性系統(tong)軟件具有去(qu)除(chu)殘渣(zha)、保持液(ye)體清潔的(de)(de)作用(yong)(yong)。當殘渣(zha)的(de)(de)相(xiang)對(dui)密(mi)(mi)(mi)(mi)度(du)(du)小于液(ye)體媒(mei)質相(xiang)對(dui)密(mi)(mi)(mi)(mi)度(du)(du)時，能用(yong)(yong)過濾(lv)裝置去(qu)除(chu)殘渣(zha)；而當殘渣(zha)的(de)(de)相(xiang)對(dui)密(mi)(mi)(mi)(mi)度(du)(du)超(chao)過液(ye)體媒(mei)質相(xiang)對(dui)密(mi)(mi)(mi)(mi)度(du)(du)時，可選用(yong)(yong)旋液(ye)分離設備或網式過濾(lv)器去(qu)除(chu)殘渣(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。借助原平機械密封可以用雙端原平機械密封代替密封介(jie)(jie)質(zhi)，將(jiang)難以直接密封的介(jie)(jie)質(zhi)轉化為(wei)密封潤(run)滑性能好、清(qing)潔的密封液體介(jie)(jie)質(zhi)。