沈陽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。在沈陽機械密封系(xi)(xi)(xi)統(tong)(tong)(tong)(tong)(tong)(tong)(tong)中(zhong)，上(shang)述(shu)系(xi)(xi)(xi)統(tong)(tong)(tong)(tong)(tong)(tong)(tong)并不同時包(bao)括(kuo)在內。密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)系(xi)(xi)(xi)統(tong)(tong)(tong)(tong)(tong)(tong)(tong)的選擇主(zhu)要取(qu)決(jue)于主(zhu)密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)件的應用(yong)(yong)范圍。例如，如果(guo)主(zhu)密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)用(yong)(yong)于高(gao)溫(wen)(wen)液體(ti)，密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)系(xi)(xi)(xi)統(tong)(tong)(tong)(tong)(tong)(tong)(tong)應確(que)保(bao)降(jiang)低主(zhu)密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)的環境溫(wen)(wen)度，即采用(yong)(yong)溫(wen)(wen)度控制(zhi)系(xi)(xi)(xi)統(tong)(tong)(tong)(tong)(tong)(tong)(tong)。如果(guo)主(zhu)密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)用(yong)(yong)于固(gu)(gu)體(ti)雜(za)質(zhi)含量(liang)高(gao)的工作介質(zhi)，密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)系(xi)(xi)(xi)統(tong)(tong)(tong)(tong)(tong)(tong)(tong)應確(que)保(bao)在主(zhu)密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)前降(jiang)低固(gu)(gu)體(ti)雜(za)質(zhi)含量(liang)，即采用(yong)(yong)除雜(za)系(xi)(xi)(xi)統(tong)(tong)(tong)(tong)(tong)(tong)(tong)。在腐蝕性介質(zhi)中(zhong)，密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)系(xi)(xi)(xi)統(tong)(tong)(tong)(tong)(tong)(tong)(tong)必須確(que)保(bao)主(zhu)密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)降(jiang)低腐蝕速率或消(xiao)除腐蝕，即使用(yong)(yong)流體(ti)而不是(shi)堵塞(sai)流體(ti)系(xi)(xi)(xi)統(tong)(tong)(tong)(tong)(tong)(tong)(tong)；在高(gao)壓密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)裝置中(zhong)，輔助系(xi)(xi)(xi)統(tong)(tong)(tong)(tong)(tong)(tong)(tong)應確(que)保(bao)多級降(jiang)壓和(he)其他措(cuo)施，即壓力控制(zhi)系(xi)(xi)(xi)統(tong)(tong)(tong)(tong)(tong)(tong)(tong)。

　　沈陽機械密封的三個主要(yao)功(gong)能如下(xia)：

　　1、沖洗功能，沖洗是沈陽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。一般的沈陽機械密封應(ying)該沖洗，特別是對于輕烴泵，沖洗時達到隔離(li)介質、冷卻和改善潤滑的目的。隔離(li)介質的目的可以通過將與介質相容的液體引入密封腔進行外部循環沖洗來(lai)實現。

　　2、除雜和過濾功能，密封流體中的微細固體粒子、污垢等雜質對沈陽機械密封造成的(de)(de)(de)危害非(fei)常嚴(yan)重，可(ke)能導致密(mi)封(feng)端(duan)面的(de)(de)(de)磨損，也可(ke)能堵(du)塞寒冷密(mi)封(feng)系統的(de)(de)(de)管線。密(mi)封(feng)性系統軟件(jian)具有去除(chu)殘(can)渣(zha)、保(bao)持(chi)液體清(qing)潔的(de)(de)(de)作用(yong)。當殘(can)渣(zha)的(de)(de)(de)相對密(mi)度(du)小于(yu)液體媒質(zhi)相對密(mi)度(du)時，能用(yong)過(guo)濾裝置(zhi)去除(chu)殘(can)渣(zha)；而(er)當殘(can)渣(zha)的(de)(de)(de)相對密(mi)度(du)超過(guo)液體媒質(zhi)相對密(mi)度(du)時，可(ke)選用(yong)旋(xuan)液分離(li)設(she)備或網式過(guo)濾器去除(chu)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。借助沈陽機械密封可以用雙端沈陽機械密封代替密(mi)封介質，將(jiang)難以直接密(mi)封的介質轉化為密(mi)封潤滑性能(neng)好、清(qing)潔的密(mi)封液體介質。