邊壩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。在邊壩機械密封系(xi)(xi)(xi)統(tong)(tong)(tong)(tong)中(zhong)，上(shang)述系(xi)(xi)(xi)統(tong)(tong)(tong)(tong)并(bing)不(bu)同(tong)時包括(kuo)在內。密(mi)(mi)(mi)封(feng)系(xi)(xi)(xi)統(tong)(tong)(tong)(tong)的選擇主(zhu)(zhu)(zhu)要取決于(yu)主(zhu)(zhu)(zhu)密(mi)(mi)(mi)封(feng)件的應(ying)用范(fan)圍。例如，如果主(zhu)(zhu)(zhu)密(mi)(mi)(mi)封(feng)用于(yu)高(gao)溫液體，密(mi)(mi)(mi)封(feng)系(xi)(xi)(xi)統(tong)(tong)(tong)(tong)應(ying)確(que)(que)保降(jiang)(jiang)(jiang)低(di)主(zhu)(zhu)(zhu)密(mi)(mi)(mi)封(feng)的環境溫度，即(ji)采(cai)用溫度控制系(xi)(xi)(xi)統(tong)(tong)(tong)(tong)。如果主(zhu)(zhu)(zhu)密(mi)(mi)(mi)封(feng)用于(yu)固體雜質(zhi)含(han)(han)量(liang)高(gao)的工作介質(zhi)，密(mi)(mi)(mi)封(feng)系(xi)(xi)(xi)統(tong)(tong)(tong)(tong)應(ying)確(que)(que)保在主(zhu)(zhu)(zhu)密(mi)(mi)(mi)封(feng)前降(jiang)(jiang)(jiang)低(di)固體雜質(zhi)含(han)(han)量(liang)，即(ji)采(cai)用除雜系(xi)(xi)(xi)統(tong)(tong)(tong)(tong)。在腐蝕性介質(zhi)中(zhong)，密(mi)(mi)(mi)封(feng)系(xi)(xi)(xi)統(tong)(tong)(tong)(tong)必須(xu)確(que)(que)保主(zhu)(zhu)(zhu)密(mi)(mi)(mi)封(feng)降(jiang)(jiang)(jiang)低(di)腐蝕速率或(huo)消除腐蝕，即(ji)使用流體而不(bu)是堵塞流體系(xi)(xi)(xi)統(tong)(tong)(tong)(tong)；在高(gao)壓密(mi)(mi)(mi)封(feng)裝(zhuang)置(zhi)中(zhong)，輔助(zhu)系(xi)(xi)(xi)統(tong)(tong)(tong)(tong)應(ying)確(que)(que)保多級降(jiang)(jiang)(jiang)壓和其他(ta)措(cuo)施，即(ji)壓力控制系(xi)(xi)(xi)統(tong)(tong)(tong)(tong)。

　　邊壩機械密封的三個主要功能如下(xia)：

　　1、沖洗功能，沖洗是邊壩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。一般的邊壩機械密封應該沖洗，特(te)別是對于輕烴泵，沖洗時(shi)達(da)到隔(ge)(ge)離介質(zhi)、冷(leng)卻(que)和改善(shan)潤滑的(de)(de)(de)目的(de)(de)(de)。隔(ge)(ge)離介質(zhi)的(de)(de)(de)目的(de)(de)(de)可(ke)以(yi)通過將與(yu)介質(zhi)相容的(de)(de)(de)液(ye)體引入密封腔進(jin)行外部循環(huan)沖洗來實現。

　　2、除雜和過濾功能，密封流體中的微細固體粒子、污垢等雜質對邊壩機械密封造成的(de)(de)危害非常嚴重，可(ke)能(neng)導致密封(feng)(feng)端面的(de)(de)磨損，也可(ke)能(neng)堵塞寒冷密封(feng)(feng)系統的(de)(de)管線。密封(feng)(feng)性系統軟件具有去除(chu)殘(can)(can)(can)渣(zha)、保持液(ye)體(ti)清潔的(de)(de)作用。當殘(can)(can)(can)渣(zha)的(de)(de)相對密度(du)小于液(ye)體(ti)媒質相對密度(du)時，能(neng)用過(guo)濾(lv)裝置去除(chu)殘(can)(can)(can)渣(zha)；而當殘(can)(can)(can)渣(zha)的(de)(de)相對密度(du)超(chao)過(guo)液(ye)體(ti)媒質相對密度(du)時，可(ke)選用旋液(ye)分離設備或(huo)網式過(guo)濾(lv)器去除(chu)殘(can)(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。借助邊壩機械密封可以用雙端邊壩機械密封代替(ti)密封(feng)介(jie)質，將難(nan)以直接密封(feng)的介(jie)質轉化為(wei)密封(feng)潤滑性能好、清潔(jie)的密封(feng)液(ye)體介(jie)質。