反壓狀態是不良的工作狀態，介質中的顆粒、雜質很容易進入密封面，使密封失效。磨軸的主要件為橡膠波紋管，且由于上端密封面處于不良潤滑狀態，動靜環之間的摩擦力矩大于橡膠波紋管與軸之間的傳遞轉矩，從而發生相對轉動。動、靜環輔助密封由于受到污水中的弱酸、弱堿的腐蝕，橡膠件已無彈性。渣漿雙臺子泵用雙臺子機械密封的工作原理要求雙臺子機械密封內部無任何雜質，在組裝雙臺子機械密封前要徹底清掃動環、靜環、軸套等部件，檢查動靜環表面是否存在劃痕、裂紋等缺陷，這些缺陷存在會造成雙臺子機械密封嚴重漏泄。必要時可以制(zhi)作工裝在組裝前水壓試驗，檢查動(dong)靜環座是否(fou)存(cun)在影響密封的缺陷。

　　渣漿雙臺子泵用雙臺子機械密封由于密封面變形所引起的，而且雙臺子機械密封面泄漏的概率是很高的。如果泵在啟動時就發生雙臺子泵用雙臺子機械密封泄漏，而拆查密封面時看不見有損壞的地方，這時就應該用平晶檢查雙臺子機械密封的(de)變形(xing)情況。如(ru)果發生變形(xing)，用(yong)平晶檢(jian)查(cha)密封面的(de)干涉帶的(de)變化(hua)情況，密封面變形(xing)存在于(yu)動環和(he)靜環之間(jian)。

　　壓(ya)缸(gang)體動(dong)(dong)(dong)(dong)(dong)態密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)系統采用(yong)的(de)(de)(de)(de)是(shi)主密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)設(she)計(ji)(ji)，一般都用(yong)U型密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)圈。液(ye)壓(ya)缸(gang)體的(de)(de)(de)(de)往復式(shi)動(dong)(dong)(dong)(dong)(dong)態密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)系統的(de)(de)(de)(de)設(she)計(ji)(ji)，開(kai)始使用(yong)了更加復雜的(de)(de)(de)(de)U型圈和(he)同軸密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)組件的(de)(de)(de)(de)復合(he)式(shi)設(she)計(ji)(ji)。密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)的(de)(de)(de)(de)靜(jing)(jing)環(huan)(huan)(huan)(huan)通(tong)常固定在殼(ke)體上，動(dong)(dong)(dong)(dong)(dong)環(huan)(huan)(huan)(huan)通(tong)過(guo)(guo)彈(dan)(dan)簧、彈(dan)(dan)簧座與(yu)軸一同旋(xuan)轉。靜(jing)(jing)環(huan)(huan)(huan)(huan)與(yu)殼(ke)體、動(dong)(dong)(dong)(dong)(dong)環(huan)(huan)(huan)(huan)與(yu)軸形成(cheng)的(de)(de)(de)(de)間隙(xi)用(yong)成(cheng)型填料(liao)密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)。在動(dong)(dong)(dong)(dong)(dong)環(huan)(huan)(huan)(huan)和(he)靜(jing)(jing)環(huan)(huan)(huan)(huan)接觸的(de)(de)(de)(de)端面(mian)(mian)形成(cheng)相對滑動(dong)(dong)(dong)(dong)(dong)面(mian)(mian)，即動(dong)(dong)(dong)(dong)(dong)密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)面(mian)(mian)。為保證密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)良(liang)好(hao)(hao)，動(dong)(dong)(dong)(dong)(dong)密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)面(mian)(mian)應十分平直(zhi)和(he)光潔(jie)。彈(dan)(dan)簧力和(he)被(bei)密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)的(de)(de)(de)(de)流體壓(ya)力使動(dong)(dong)(dong)(dong)(dong)環(huan)(huan)(huan)(huan)貼緊靜(jing)(jing)環(huan)(huan)(huan)(huan)。因(yin)動(dong)(dong)(dong)(dong)(dong)環(huan)(huan)(huan)(huan)與(yu)軸通(tong)過(guo)(guo)彈(dan)(dan)簧連接，動(dong)(dong)(dong)(dong)(dong)環(huan)(huan)(huan)(huan)和(he)靜(jing)(jing)環(huan)(huan)(huan)(huan)間貼合(he)性受軸的(de)(de)(de)(de)振動(dong)(dong)(dong)(dong)(dong)和(he)擺動(dong)(dong)(dong)(dong)(dong)影響(xiang)較(jiao)小。靜(jing)(jing)環(huan)(huan)(huan)(huan)一般常用(yong)潤滑性好(hao)(hao)的(de)(de)(de)(de)軟(ruan)質材料(liao)如石墨、填充(chong)聚四氟乙(yi)烯(xi)等，動(dong)(dong)(dong)(dong)(dong)環(huan)(huan)(huan)(huan)多(duo)用(yong)硬質合(he)金、陶瓷等材料(liao)制造。