曲松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。在曲松機械密封系(xi)(xi)(xi)統(tong)(tong)(tong)中(zhong)，上述(shu)系(xi)(xi)(xi)統(tong)(tong)(tong)并(bing)不(bu)同時包(bao)括在(zai)內。密(mi)封(feng)(feng)(feng)系(xi)(xi)(xi)統(tong)(tong)(tong)的(de)(de)選(xuan)擇主(zhu)要取決于主(zhu)密(mi)封(feng)(feng)(feng)件的(de)(de)應(ying)用(yong)(yong)范圍。例如，如果主(zhu)密(mi)封(feng)(feng)(feng)用(yong)(yong)于高溫液體，密(mi)封(feng)(feng)(feng)系(xi)(xi)(xi)統(tong)(tong)(tong)應(ying)確(que)(que)保(bao)降低(di)(di)主(zhu)密(mi)封(feng)(feng)(feng)的(de)(de)環(huan)境溫度(du)，即采用(yong)(yong)溫度(du)控(kong)制(zhi)(zhi)系(xi)(xi)(xi)統(tong)(tong)(tong)。如果主(zhu)密(mi)封(feng)(feng)(feng)用(yong)(yong)于固體雜(za)質含量(liang)(liang)高的(de)(de)工作介質，密(mi)封(feng)(feng)(feng)系(xi)(xi)(xi)統(tong)(tong)(tong)應(ying)確(que)(que)保(bao)在(zai)主(zhu)密(mi)封(feng)(feng)(feng)前降低(di)(di)固體雜(za)質含量(liang)(liang)，即采用(yong)(yong)除雜(za)系(xi)(xi)(xi)統(tong)(tong)(tong)。在(zai)腐(fu)(fu)蝕(shi)性(xing)介質中(zhong)，密(mi)封(feng)(feng)(feng)系(xi)(xi)(xi)統(tong)(tong)(tong)必須確(que)(que)保(bao)主(zhu)密(mi)封(feng)(feng)(feng)降低(di)(di)腐(fu)(fu)蝕(shi)速率或消除腐(fu)(fu)蝕(shi)，即使用(yong)(yong)流體而(er)不(bu)是堵(du)塞流體系(xi)(xi)(xi)統(tong)(tong)(tong)；在(zai)高壓密(mi)封(feng)(feng)(feng)裝置(zhi)中(zhong)，輔助(zhu)系(xi)(xi)(xi)統(tong)(tong)(tong)應(ying)確(que)(que)保(bao)多級降壓和其他措施(shi)，即壓力控(kong)制(zhi)(zhi)系(xi)(xi)(xi)統(tong)(tong)(tong)。

　　曲松機械密封的三個主要功(gong)能如下(xia)：

　　1、沖洗功能，沖洗是曲松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。一般的曲松機械密封應該沖(chong)(chong)洗，特別是對(dui)于(yu)輕烴泵，沖(chong)(chong)洗時達到隔離介(jie)(jie)質(zhi)(zhi)、冷(leng)卻和改善潤(run)滑的(de)(de)目(mu)的(de)(de)。隔離介(jie)(jie)質(zhi)(zhi)的(de)(de)目(mu)的(de)(de)可以通過(guo)將與介(jie)(jie)質(zhi)(zhi)相容的(de)(de)液體(ti)引入密封腔(qiang)進(jin)行外部循環沖(chong)(chong)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、污垢等雜質對曲松機械密封造成(cheng)的(de)(de)危害非常(chang)嚴重，可能導致密(mi)(mi)封端面的(de)(de)磨損，也可能堵塞寒冷密(mi)(mi)封系統的(de)(de)管線。密(mi)(mi)封性系統軟件具(ju)有去除殘(can)(can)渣(zha)、保持液(ye)(ye)體清潔的(de)(de)作用。當(dang)殘(can)(can)渣(zha)的(de)(de)相對密(mi)(mi)度(du)小于(yu)液(ye)(ye)體媒質(zhi)相對密(mi)(mi)度(du)時，能用過(guo)濾裝置(zhi)去除殘(can)(can)渣(zha)；而當(dang)殘(can)(can)渣(zha)的(de)(de)相對密(mi)(mi)度(du)超過(guo)液(ye)(ye)體媒質(zhi)相對密(mi)(mi)度(du)時，可選(xuan)用旋液(ye)(ye)分離(li)設備或網(wang)式過(guo)濾器去除殘(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。借助曲松機械密封可以用雙端曲松機械密封代替密(mi)(mi)封(feng)介質，將難(nan)以直接密(mi)(mi)封(feng)的介質轉化為密(mi)(mi)封(feng)潤滑性(xing)能好、清潔的密(mi)(mi)封(feng)液體介質。