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。渣漿昌寧泵用昌寧機械密封的工作原理要求昌寧機械密封內部無任何雜質，在組裝昌寧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昌寧機械密封嚴重漏泄。必要時可以制作工裝(zhuang)在組裝(zhuang)前水壓(ya)試驗，檢查(cha)動靜環座是否存(cun)在影(ying)響密(mi)封的缺陷。

　　渣漿昌寧泵用昌寧機械密封由于密封面變形所引起的，而且昌寧機械密封面泄漏的概率是很高的。如果泵在啟動時就發生昌寧泵用昌寧機械密封泄漏，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昌寧機械密封的(de)(de)變(bian)形情況(kuang)。如果發生變(bian)形，用(yong)平晶檢查(cha)密(mi)封(feng)面(mian)(mian)的(de)(de)干(gan)涉帶(dai)的(de)(de)變(bian)化情況(kuang)，密(mi)封(feng)面(mian)(mian)變(bian)形存(cun)在于動(dong)環和靜環之間(jian)。

　　壓(ya)缸(gang)體(ti)動(dong)(dong)(dong)(dong)(dong)態密(mi)(mi)(mi)封(feng)系統采用(yong)(yong)的(de)(de)是(shi)主(zhu)密(mi)(mi)(mi)封(feng)設(she)(she)計(ji)，一般都用(yong)(yong)U型密(mi)(mi)(mi)封(feng)圈。液壓(ya)缸(gang)體(ti)的(de)(de)往復式動(dong)(dong)(dong)(dong)(dong)態密(mi)(mi)(mi)封(feng)系統的(de)(de)設(she)(she)計(ji)，開始使用(yong)(yong)了更加復雜的(de)(de)U型圈和(he)(he)同軸密(mi)(mi)(mi)封(feng)組件的(de)(de)復合(he)式設(she)(she)計(ji)。密(mi)(mi)(mi)封(feng)的(de)(de)靜環(huan)(huan)(huan)通(tong)常(chang)固定在(zai)殼(ke)體(ti)上，動(dong)(dong)(dong)(dong)(dong)環(huan)(huan)(huan)通(tong)過(guo)彈簧(huang)、彈簧(huang)座與(yu)(yu)軸一同旋轉。靜環(huan)(huan)(huan)與(yu)(yu)殼(ke)體(ti)、動(dong)(dong)(dong)(dong)(dong)環(huan)(huan)(huan)與(yu)(yu)軸形(xing)成(cheng)的(de)(de)間隙用(yong)(yong)成(cheng)型填料密(mi)(mi)(mi)封(feng)。在(zai)動(dong)(dong)(dong)(dong)(dong)環(huan)(huan)(huan)和(he)(he)靜環(huan)(huan)(huan)接觸的(de)(de)端面(mian)形(xing)成(cheng)相對滑動(dong)(dong)(dong)(dong)(dong)面(mian)，即動(dong)(dong)(dong)(dong)(dong)密(mi)(mi)(mi)封(feng)面(mian)。為保(bao)證密(mi)(mi)(mi)封(feng)良好，動(dong)(dong)(dong)(dong)(dong)密(mi)(mi)(mi)封(feng)面(mian)應十分平直和(he)(he)光潔。彈簧(huang)力和(he)(he)被密(mi)(mi)(mi)封(feng)的(de)(de)流體(ti)壓(ya)力使動(dong)(dong)(dong)(dong)(dong)環(huan)(huan)(huan)貼緊靜環(huan)(huan)(huan)。因動(dong)(dong)(dong)(dong)(dong)環(huan)(huan)(huan)與(yu)(yu)軸通(tong)過(guo)彈簧(huang)連接，動(dong)(dong)(dong)(dong)(dong)環(huan)(huan)(huan)和(he)(he)靜環(huan)(huan)(huan)間貼合(he)性受軸的(de)(de)振動(dong)(dong)(dong)(dong)(dong)和(he)(he)擺動(dong)(dong)(dong)(dong)(dong)影響較小(xiao)。靜環(huan)(huan)(huan)一般常(chang)用(yong)(yong)潤滑性好的(de)(de)軟質材(cai)料如石墨、填充聚四氟乙烯等(deng)，動(dong)(dong)(dong)(dong)(dong)環(huan)(huan)(huan)多用(yong)(yong)硬(ying)質合(he)金(jin)、陶瓷等(deng)材(cai)料制造。