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。渣漿當陽泵用當陽機械密封的工作原理要求當陽機械密封內部無任何雜質，在組裝當陽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當陽機械密封嚴重漏泄。必要時(shi)可以制作工裝在組裝前水壓(ya)試驗，檢查動靜環座是(shi)否存在影(ying)響密封的(de)缺陷。

　　渣漿當陽泵用當陽機械密封由于密封面變形所引起的，而且當陽機械密封面泄漏的概率是很高的。如果泵在啟動時就發生當陽泵用當陽機械密封泄漏，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當陽機械密封的(de)(de)變(bian)形情況。如(ru)果發生(sheng)變(bian)形，用平晶檢查(cha)密封(feng)面(mian)的(de)(de)干(gan)涉(she)帶的(de)(de)變(bian)化情況，密封(feng)面(mian)變(bian)形存在(zai)于動(dong)環和靜環之間。

　　壓缸體(ti)動(dong)(dong)(dong)(dong)態密(mi)(mi)(mi)封(feng)系統采用(yong)(yong)的(de)(de)是主(zhu)密(mi)(mi)(mi)封(feng)設(she)計，一(yi)般都用(yong)(yong)U型密(mi)(mi)(mi)封(feng)圈(quan)。液壓缸體(ti)的(de)(de)往復式(shi)動(dong)(dong)(dong)(dong)態密(mi)(mi)(mi)封(feng)系統的(de)(de)設(she)計，開始使用(yong)(yong)了(le)更加復雜(za)的(de)(de)U型圈(quan)和(he)(he)同軸(zhou)密(mi)(mi)(mi)封(feng)組件的(de)(de)復合式(shi)設(she)計。密(mi)(mi)(mi)封(feng)的(de)(de)靜(jing)(jing)(jing)環(huan)(huan)(huan)通常固(gu)定在殼體(ti)上，動(dong)(dong)(dong)(dong)環(huan)(huan)(huan)通過彈簧(huang)(huang)、彈簧(huang)(huang)座與(yu)軸(zhou)一(yi)同旋轉。靜(jing)(jing)(jing)環(huan)(huan)(huan)與(yu)殼體(ti)、動(dong)(dong)(dong)(dong)環(huan)(huan)(huan)與(yu)軸(zhou)形成的(de)(de)間隙用(yong)(yong)成型填料密(mi)(mi)(mi)封(feng)。在動(dong)(dong)(dong)(dong)環(huan)(huan)(huan)和(he)(he)靜(jing)(jing)(jing)環(huan)(huan)(huan)接觸的(de)(de)端面(mian)形成相對滑動(dong)(dong)(dong)(dong)面(mian)，即動(dong)(dong)(dong)(dong)密(mi)(mi)(mi)封(feng)面(mian)。為保證(zheng)密(mi)(mi)(mi)封(feng)良(liang)好，動(dong)(dong)(dong)(dong)密(mi)(mi)(mi)封(feng)面(mian)應十分平直和(he)(he)光(guang)潔。彈簧(huang)(huang)力和(he)(he)被密(mi)(mi)(mi)封(feng)的(de)(de)流(liu)體(ti)壓力使動(dong)(dong)(dong)(dong)環(huan)(huan)(huan)貼緊靜(jing)(jing)(jing)環(huan)(huan)(huan)。因動(dong)(dong)(dong)(dong)環(huan)(huan)(huan)與(yu)軸(zhou)通過彈簧(huang)(huang)連接，動(dong)(dong)(dong)(dong)環(huan)(huan)(huan)和(he)(he)靜(jing)(jing)(jing)環(huan)(huan)(huan)間貼合性受軸(zhou)的(de)(de)振動(dong)(dong)(dong)(dong)和(he)(he)擺動(dong)(dong)(dong)(dong)影響較小(xiao)。靜(jing)(jing)(jing)環(huan)(huan)(huan)一(yi)般常用(yong)(yong)潤滑性好的(de)(de)軟質材料如(ru)石墨、填充聚(ju)四氟乙烯等，動(dong)(dong)(dong)(dong)環(huan)(huan)(huan)多用(yong)(yong)硬質合金、陶瓷等材料制造。