龍安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。在龍安機械密封系(xi)統(tong)(tong)(tong)中(zhong)(zhong)，上述系(xi)統(tong)(tong)(tong)并不同時包(bao)括在內。密(mi)(mi)封(feng)(feng)系(xi)統(tong)(tong)(tong)的選擇(ze)主(zhu)(zhu)要取決(jue)于(yu)主(zhu)(zhu)密(mi)(mi)封(feng)(feng)件的應(ying)用(yong)(yong)(yong)范圍。例(li)如(ru)，如(ru)果主(zhu)(zhu)密(mi)(mi)封(feng)(feng)用(yong)(yong)(yong)于(yu)高溫(wen)液體(ti)，密(mi)(mi)封(feng)(feng)系(xi)統(tong)(tong)(tong)應(ying)確(que)保降(jiang)低(di)主(zhu)(zhu)密(mi)(mi)封(feng)(feng)的環境溫(wen)度(du)，即(ji)(ji)采用(yong)(yong)(yong)溫(wen)度(du)控(kong)制(zhi)系(xi)統(tong)(tong)(tong)。如(ru)果主(zhu)(zhu)密(mi)(mi)封(feng)(feng)用(yong)(yong)(yong)于(yu)固體(ti)雜質(zhi)含(han)量高的工作介質(zhi)，密(mi)(mi)封(feng)(feng)系(xi)統(tong)(tong)(tong)應(ying)確(que)保在主(zhu)(zhu)密(mi)(mi)封(feng)(feng)前降(jiang)低(di)固體(ti)雜質(zhi)含(han)量，即(ji)(ji)采用(yong)(yong)(yong)除雜系(xi)統(tong)(tong)(tong)。在腐(fu)蝕(shi)性介質(zhi)中(zhong)(zhong)，密(mi)(mi)封(feng)(feng)系(xi)統(tong)(tong)(tong)必須確(que)保主(zhu)(zhu)密(mi)(mi)封(feng)(feng)降(jiang)低(di)腐(fu)蝕(shi)速率或消除腐(fu)蝕(shi)，即(ji)(ji)使用(yong)(yong)(yong)流體(ti)而不是堵塞流體(ti)系(xi)統(tong)(tong)(tong)；在高壓(ya)密(mi)(mi)封(feng)(feng)裝置中(zhong)(zhong)，輔助系(xi)統(tong)(tong)(tong)應(ying)確(que)保多級降(jiang)壓(ya)和(he)其(qi)他措施(shi)，即(ji)(ji)壓(ya)力控(kong)制(zhi)系(xi)統(tong)(tong)(tong)。

　　龍安機械密封的三個主要功能(neng)如下：

　　1、沖洗功能，沖洗是龍安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。一般的龍安機械密封應該沖(chong)洗，特別(bie)是對(dui)于輕(qing)烴(jing)泵(beng)，沖(chong)洗時達(da)到隔(ge)離(li)介(jie)(jie)(jie)質、冷卻(que)和改善潤滑的(de)目(mu)的(de)。隔(ge)離(li)介(jie)(jie)(jie)質的(de)目(mu)的(de)可以通過將(jiang)與介(jie)(jie)(jie)質相容的(de)液體(ti)引入密封腔進行外部(bu)循環沖(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、污垢等雜質對龍安機械密封造成的(de)危害(hai)非常嚴重，可(ke)能(neng)(neng)導致密封(feng)(feng)端面的(de)磨(mo)損，也可(ke)能(neng)(neng)堵塞寒冷(leng)密封(feng)(feng)系(xi)(xi)統(tong)的(de)管線。密封(feng)(feng)性系(xi)(xi)統(tong)軟(ruan)件(jian)具(ju)有去除(chu)殘(can)(can)(can)渣(zha)、保持(chi)液體清潔(jie)的(de)作(zuo)用。當殘(can)(can)(can)渣(zha)的(de)相(xiang)對(dui)(dui)密度(du)小于液體媒質相(xiang)對(dui)(dui)密度(du)時，能(neng)(neng)用過濾裝(zhuang)置去除(chu)殘(can)(can)(can)渣(zha)；而(er)當殘(can)(can)(can)渣(zha)的(de)相(xiang)對(dui)(dui)密度(du)超過液體媒質相(xiang)對(dui)(dui)密度(du)時，可(ke)選用旋液分(fen)離設備(bei)或網式過濾器(qi)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。借助龍安機械密封可以用雙端龍安機械密封代(dai)替密封(feng)介(jie)質，將(jiang)難(nan)以直接密封(feng)的介(jie)質轉化為密封(feng)潤(run)滑性能好、清潔(jie)的密封(feng)液(ye)體介(jie)質。