河曲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。在河曲機械密封系(xi)(xi)統(tong)(tong)(tong)(tong)中(zhong)(zhong)，上述(shu)系(xi)(xi)統(tong)(tong)(tong)(tong)并(bing)不(bu)同(tong)時包括在(zai)(zai)(zai)內。密(mi)(mi)封(feng)(feng)(feng)(feng)系(xi)(xi)統(tong)(tong)(tong)(tong)的選擇主(zhu)(zhu)要取(qu)決于主(zhu)(zhu)密(mi)(mi)封(feng)(feng)(feng)(feng)件的應用范圍。例如，如果(guo)主(zhu)(zhu)密(mi)(mi)封(feng)(feng)(feng)(feng)用于高(gao)溫(wen)液體(ti)，密(mi)(mi)封(feng)(feng)(feng)(feng)系(xi)(xi)統(tong)(tong)(tong)(tong)應確(que)保(bao)(bao)降(jiang)低(di)主(zhu)(zhu)密(mi)(mi)封(feng)(feng)(feng)(feng)的環境溫(wen)度(du)，即(ji)采(cai)用溫(wen)度(du)控制系(xi)(xi)統(tong)(tong)(tong)(tong)。如果(guo)主(zhu)(zhu)密(mi)(mi)封(feng)(feng)(feng)(feng)用于固(gu)體(ti)雜(za)質含量高(gao)的工(gong)作介質，密(mi)(mi)封(feng)(feng)(feng)(feng)系(xi)(xi)統(tong)(tong)(tong)(tong)應確(que)保(bao)(bao)在(zai)(zai)(zai)主(zhu)(zhu)密(mi)(mi)封(feng)(feng)(feng)(feng)前降(jiang)低(di)固(gu)體(ti)雜(za)質含量，即(ji)采(cai)用除(chu)雜(za)系(xi)(xi)統(tong)(tong)(tong)(tong)。在(zai)(zai)(zai)腐蝕(shi)(shi)(shi)性介質中(zhong)(zhong)，密(mi)(mi)封(feng)(feng)(feng)(feng)系(xi)(xi)統(tong)(tong)(tong)(tong)必須確(que)保(bao)(bao)主(zhu)(zhu)密(mi)(mi)封(feng)(feng)(feng)(feng)降(jiang)低(di)腐蝕(shi)(shi)(shi)速(su)率或消(xiao)除(chu)腐蝕(shi)(shi)(shi)，即(ji)使用流(liu)體(ti)而不(bu)是堵塞流(liu)體(ti)系(xi)(xi)統(tong)(tong)(tong)(tong)；在(zai)(zai)(zai)高(gao)壓密(mi)(mi)封(feng)(feng)(feng)(feng)裝置中(zhong)(zhong)，輔助(zhu)系(xi)(xi)統(tong)(tong)(tong)(tong)應確(que)保(bao)(bao)多級降(jiang)壓和(he)其他措施，即(ji)壓力控制系(xi)(xi)統(tong)(tong)(tong)(tong)。

　　河曲機械密封的三個主要功能如下(xia)：

　　1、沖洗功能，沖洗是河曲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。一般的河曲機械密封應該沖洗(xi)(xi)，特別(bie)是對于輕(qing)烴泵，沖洗(xi)(xi)時達到(dao)隔(ge)離(li)介質、冷卻(que)和(he)改(gai)善潤滑的目(mu)的。隔(ge)離(li)介質的目(mu)的可以通過將與介質相(xiang)容的液體引入(ru)密封腔進行外部循環沖洗(xi)(xi)來(lai)實(shi)現。

　　2、除雜和過濾功能，密封流體中的微細固體粒子、污垢等雜質對河曲機械密封造成的(de)(de)危(wei)害非常(chang)嚴(yan)重，可能導致(zhi)密(mi)(mi)封端面的(de)(de)磨損，也可能堵塞寒冷密(mi)(mi)封系統(tong)的(de)(de)管線。密(mi)(mi)封性系統(tong)軟件具有去除殘(can)(can)(can)渣、保(bao)持液體清潔的(de)(de)作用。當殘(can)(can)(can)渣的(de)(de)相對(dui)密(mi)(mi)度(du)小于液體媒(mei)質相對(dui)密(mi)(mi)度(du)時(shi)，能用過濾裝置去除殘(can)(can)(can)渣；而當殘(can)(can)(can)渣的(de)(de)相對(dui)密(mi)(mi)度(du)超過液體媒(mei)質相對(dui)密(mi)(mi)度(du)時(shi)，可選用旋液分(fen)離設備或網(wang)式過濾器去除殘(can)(can)(can)渣。

　　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。借助河曲機械密封可以用雙端河曲機械密封代(dai)替密(mi)封介(jie)質，將難以直(zhi)接密(mi)封的介(jie)質轉化為密(mi)封潤(run)滑(hua)性能(neng)好、清潔(jie)的密(mi)封液體介(jie)質。