孝感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。在孝感機械密封系統(tong)(tong)(tong)(tong)(tong)中(zhong)，上述系統(tong)(tong)(tong)(tong)(tong)并不(bu)同時包括(kuo)在(zai)內。密(mi)封(feng)(feng)(feng)(feng)(feng)系統(tong)(tong)(tong)(tong)(tong)的(de)(de)選(xuan)擇(ze)主(zhu)要取決于主(zhu)密(mi)封(feng)(feng)(feng)(feng)(feng)件(jian)的(de)(de)應(ying)(ying)用(yong)范圍。例如，如果主(zhu)密(mi)封(feng)(feng)(feng)(feng)(feng)用(yong)于高溫液體(ti)，密(mi)封(feng)(feng)(feng)(feng)(feng)系統(tong)(tong)(tong)(tong)(tong)應(ying)(ying)確保(bao)降(jiang)(jiang)低(di)主(zhu)密(mi)封(feng)(feng)(feng)(feng)(feng)的(de)(de)環境溫度(du)，即采用(yong)溫度(du)控制系統(tong)(tong)(tong)(tong)(tong)。如果主(zhu)密(mi)封(feng)(feng)(feng)(feng)(feng)用(yong)于固體(ti)雜(za)質含(han)量高的(de)(de)工(gong)作介質，密(mi)封(feng)(feng)(feng)(feng)(feng)系統(tong)(tong)(tong)(tong)(tong)應(ying)(ying)確保(bao)在(zai)主(zhu)密(mi)封(feng)(feng)(feng)(feng)(feng)前降(jiang)(jiang)低(di)固體(ti)雜(za)質含(han)量，即采用(yong)除雜(za)系統(tong)(tong)(tong)(tong)(tong)。在(zai)腐蝕(shi)(shi)性(xing)介質中(zhong)，密(mi)封(feng)(feng)(feng)(feng)(feng)系統(tong)(tong)(tong)(tong)(tong)必須確保(bao)主(zhu)密(mi)封(feng)(feng)(feng)(feng)(feng)降(jiang)(jiang)低(di)腐蝕(shi)(shi)速率或消除腐蝕(shi)(shi)，即使用(yong)流(liu)體(ti)而不(bu)是(shi)堵塞流(liu)體(ti)系統(tong)(tong)(tong)(tong)(tong)；在(zai)高壓(ya)密(mi)封(feng)(feng)(feng)(feng)(feng)裝(zhuang)置中(zhong)，輔助系統(tong)(tong)(tong)(tong)(tong)應(ying)(ying)確保(bao)多級降(jiang)(jiang)壓(ya)和(he)其他措施，即壓(ya)力(li)控制系統(tong)(tong)(tong)(tong)(tong)。

　　孝感機械密封的(de)三個(ge)主(zhu)要功能如下：

　　1、沖洗功能，沖洗是孝感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。一般的孝感機械密封應該沖(chong)洗(xi)，特別是對于輕烴泵，沖(chong)洗(xi)時達到隔離介(jie)質(zhi)、冷卻和改善潤滑的目(mu)的。隔離介(jie)質(zhi)的目(mu)的可以通過將(jiang)與介(jie)質(zhi)相容的液體引(yin)入密封腔進行外部循環沖(chong)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、污垢等雜質對孝感機械密封造成的(de)(de)危害非常嚴重，可能導致(zhi)密(mi)封端面的(de)(de)磨損(sun)，也可能堵塞寒冷密(mi)封系統(tong)的(de)(de)管線。密(mi)封性系統(tong)軟件(jian)具有去(qu)除(chu)殘(can)(can)渣(zha)、保持液(ye)體(ti)清潔的(de)(de)作用(yong)。當殘(can)(can)渣(zha)的(de)(de)相(xiang)對(dui)(dui)密(mi)度小(xiao)于液(ye)體(ti)媒(mei)質相(xiang)對(dui)(dui)密(mi)度時，能用(yong)過(guo)濾裝(zhuang)置(zhi)去(qu)除(chu)殘(can)(can)渣(zha)；而(er)當殘(can)(can)渣(zha)的(de)(de)相(xiang)對(dui)(dui)密(mi)度超過(guo)液(ye)體(ti)媒(mei)質相(xiang)對(dui)(dui)密(mi)度時，可選用(yong)旋液(ye)分離設備或網式過(guo)濾器去(qu)除(chu)殘(can)(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。借助孝感機械密封可以用雙端孝感機械密封代替密封介(jie)質，將難(nan)以(yi)直(zhi)接密封的(de)介(jie)質轉化為密封潤滑性能(neng)好、清潔的(de)密封液體(ti)介(jie)質。