應城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。在應城機械密封系(xi)(xi)(xi)(xi)(xi)統(tong)(tong)(tong)(tong)中，上述系(xi)(xi)(xi)(xi)(xi)統(tong)(tong)(tong)(tong)并(bing)不同時包括在(zai)(zai)內。密(mi)(mi)(mi)(mi)封(feng)系(xi)(xi)(xi)(xi)(xi)統(tong)(tong)(tong)(tong)的(de)(de)選擇主(zhu)要(yao)取決于主(zhu)密(mi)(mi)(mi)(mi)封(feng)件的(de)(de)應用(yong)范(fan)圍。例如，如果主(zhu)密(mi)(mi)(mi)(mi)封(feng)用(yong)于高(gao)溫液體(ti)(ti)，密(mi)(mi)(mi)(mi)封(feng)系(xi)(xi)(xi)(xi)(xi)統(tong)(tong)(tong)(tong)應確(que)保(bao)(bao)降低(di)主(zhu)密(mi)(mi)(mi)(mi)封(feng)的(de)(de)環境溫度，即采用(yong)溫度控(kong)制系(xi)(xi)(xi)(xi)(xi)統(tong)(tong)(tong)(tong)。如果主(zhu)密(mi)(mi)(mi)(mi)封(feng)用(yong)于固(gu)體(ti)(ti)雜(za)質(zhi)含量(liang)高(gao)的(de)(de)工作介質(zhi)，密(mi)(mi)(mi)(mi)封(feng)系(xi)(xi)(xi)(xi)(xi)統(tong)(tong)(tong)(tong)應確(que)保(bao)(bao)在(zai)(zai)主(zhu)密(mi)(mi)(mi)(mi)封(feng)前降低(di)固(gu)體(ti)(ti)雜(za)質(zhi)含量(liang)，即采用(yong)除(chu)雜(za)系(xi)(xi)(xi)(xi)(xi)統(tong)(tong)(tong)(tong)。在(zai)(zai)腐(fu)蝕(shi)性(xing)介質(zhi)中，密(mi)(mi)(mi)(mi)封(feng)系(xi)(xi)(xi)(xi)(xi)統(tong)(tong)(tong)(tong)必須確(que)保(bao)(bao)主(zhu)密(mi)(mi)(mi)(mi)封(feng)降低(di)腐(fu)蝕(shi)速率或消除(chu)腐(fu)蝕(shi)，即使用(yong)流(liu)體(ti)(ti)而不是堵(du)塞流(liu)體(ti)(ti)系(xi)(xi)(xi)(xi)(xi)統(tong)(tong)(tong)(tong)；在(zai)(zai)高(gao)壓密(mi)(mi)(mi)(mi)封(feng)裝置中，輔(fu)助系(xi)(xi)(xi)(xi)(xi)統(tong)(tong)(tong)(tong)應確(que)保(bao)(bao)多級降壓和其他措(cuo)施，即壓力(li)控(kong)制系(xi)(xi)(xi)(xi)(xi)統(tong)(tong)(tong)(tong)。

　　應城機械密封的三個主要功(gong)能如下：

　　1、沖洗功能，沖洗是應城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。一般的應城機械密封應該(gai)沖洗(xi)(xi)，特(te)別是對于(yu)輕烴泵，沖洗(xi)(xi)時達到隔(ge)離(li)介(jie)(jie)質、冷卻和(he)改(gai)善潤滑的(de)(de)目的(de)(de)。隔(ge)離(li)介(jie)(jie)質的(de)(de)目的(de)(de)可(ke)以(yi)通過(guo)將(jiang)與(yu)介(jie)(jie)質相(xiang)容的(de)(de)液體引入密封(feng)腔進行外部循環沖洗(xi)(xi)來(lai)實現。

　　2、除雜和過濾功能，密封流體中的微細固體粒子、污垢等雜質對應城機械密封造成的(de)危害非(fei)常嚴重，可(ke)能(neng)導(dao)致密(mi)(mi)封端面的(de)磨損，也可(ke)能(neng)堵塞寒(han)冷密(mi)(mi)封系(xi)統的(de)管線(xian)。密(mi)(mi)封性系(xi)統軟件(jian)具有去(qu)除(chu)殘(can)(can)渣(zha)(zha)、保持液體清潔的(de)作用。當殘(can)(can)渣(zha)(zha)的(de)相對密(mi)(mi)度小于液體媒(mei)質相對密(mi)(mi)度時，能(neng)用過(guo)濾裝置(zhi)去(qu)除(chu)殘(can)(can)渣(zha)(zha)；而當殘(can)(can)渣(zha)(zha)的(de)相對密(mi)(mi)度超過(guo)液體媒(mei)質相對密(mi)(mi)度時，可(ke)選用旋液分離設備或網式過(guo)濾器去(qu)除(chu)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。借助應城機械密封可以用雙端應城機械密封代替密封介質(zhi)，將難以(yi)直(zhi)接密封的介質(zhi)轉化為密封潤滑性能好、清潔的密封液體(ti)介質(zhi)。