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。渣漿卓尼泵用卓尼機械密封的工作原理要求卓尼機械密封內部無任何雜質，在組裝卓尼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卓尼機械密封嚴重漏泄。必(bi)要時可以(yi)制作(zuo)工(gong)裝(zhuang)在(zai)組裝(zhuang)前水壓試驗，檢查動靜(jing)環座是否存在(zai)影響密(mi)封的缺陷。

　　渣漿卓尼泵用卓尼機械密封由于密封面變形所引起的，而且卓尼機械密封面泄漏的概率是很高的。如果泵在啟動時就發生卓尼泵用卓尼機械密封泄漏，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卓尼機械密封的(de)變(bian)(bian)(bian)形情況。如果發生變(bian)(bian)(bian)形，用平晶檢查密封面(mian)的(de)干涉帶的(de)變(bian)(bian)(bian)化情況，密封面(mian)變(bian)(bian)(bian)形存在(zai)于動環和靜環之間(jian)。

　　壓(ya)缸(gang)體(ti)(ti)動(dong)(dong)(dong)態密(mi)(mi)(mi)封系統采用(yong)(yong)的(de)是(shi)主密(mi)(mi)(mi)封設計，一(yi)般(ban)都用(yong)(yong)U型密(mi)(mi)(mi)封圈。液壓(ya)缸(gang)體(ti)(ti)的(de)往復式動(dong)(dong)(dong)態密(mi)(mi)(mi)封系統的(de)設計，開始使用(yong)(yong)了更加復雜的(de)U型圈和(he)同(tong)軸(zhou)密(mi)(mi)(mi)封組(zu)件的(de)復合(he)(he)式設計。密(mi)(mi)(mi)封的(de)靜(jing)(jing)(jing)(jing)環(huan)(huan)(huan)(huan)(huan)通(tong)常固定在(zai)殼體(ti)(ti)上，動(dong)(dong)(dong)環(huan)(huan)(huan)(huan)(huan)通(tong)過彈簧(huang)、彈簧(huang)座與(yu)(yu)軸(zhou)一(yi)同(tong)旋(xuan)轉。靜(jing)(jing)(jing)(jing)環(huan)(huan)(huan)(huan)(huan)與(yu)(yu)殼體(ti)(ti)、動(dong)(dong)(dong)環(huan)(huan)(huan)(huan)(huan)與(yu)(yu)軸(zhou)形(xing)成的(de)間隙用(yong)(yong)成型填料(liao)(liao)密(mi)(mi)(mi)封。在(zai)動(dong)(dong)(dong)環(huan)(huan)(huan)(huan)(huan)和(he)靜(jing)(jing)(jing)(jing)環(huan)(huan)(huan)(huan)(huan)接觸的(de)端(duan)面(mian)形(xing)成相(xiang)對滑動(dong)(dong)(dong)面(mian)，即動(dong)(dong)(dong)密(mi)(mi)(mi)封面(mian)。為保證密(mi)(mi)(mi)封良好(hao)，動(dong)(dong)(dong)密(mi)(mi)(mi)封面(mian)應十分平直和(he)光潔。彈簧(huang)力和(he)被密(mi)(mi)(mi)封的(de)流體(ti)(ti)壓(ya)力使動(dong)(dong)(dong)環(huan)(huan)(huan)(huan)(huan)貼(tie)緊靜(jing)(jing)(jing)(jing)環(huan)(huan)(huan)(huan)(huan)。因動(dong)(dong)(dong)環(huan)(huan)(huan)(huan)(huan)與(yu)(yu)軸(zhou)通(tong)過彈簧(huang)連接，動(dong)(dong)(dong)環(huan)(huan)(huan)(huan)(huan)和(he)靜(jing)(jing)(jing)(jing)環(huan)(huan)(huan)(huan)(huan)間貼(tie)合(he)(he)性受(shou)軸(zhou)的(de)振動(dong)(dong)(dong)和(he)擺動(dong)(dong)(dong)影響較小。靜(jing)(jing)(jing)(jing)環(huan)(huan)(huan)(huan)(huan)一(yi)般(ban)常用(yong)(yong)潤滑性好(hao)的(de)軟(ruan)質(zhi)(zhi)材料(liao)(liao)如石墨、填充聚四氟乙烯等，動(dong)(dong)(dong)環(huan)(huan)(huan)(huan)(huan)多用(yong)(yong)硬質(zhi)(zhi)合(he)(he)金、陶(tao)瓷等材料(liao)(liao)制造。