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。渣漿泵用西陵機械密封的工作原理要求西陵機械密封內部無任何雜質，在組裝西陵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西陵機械密封嚴重漏泄。必要時可以制作工(gong)裝在(zai)(zai)組裝前水壓試(shi)驗，檢查動靜環座是(shi)否存在(zai)(zai)影響密封的(de)缺陷。

　　渣漿西陵泵用西陵機械密封由于密封面變形所引起的，而且西陵機械密封面泄漏的概率是很高的。如果泵在啟動時就發生西陵泵用西陵機械密封泄漏，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西陵機械密封的變(bian)形情(qing)況。如果發生變(bian)形，用平晶檢查密封(feng)面的干涉帶(dai)的變(bian)化(hua)情(qing)況，密封(feng)面變(bian)形存在(zai)于動環(huan)和靜環(huan)之間。

　　壓(ya)缸體動(dong)(dong)(dong)(dong)態密(mi)封(feng)系(xi)統采用(yong)的(de)是主密(mi)封(feng)設(she)計，一(yi)(yi)般都用(yong)U型(xing)密(mi)封(feng)圈。液壓(ya)缸體的(de)往復式動(dong)(dong)(dong)(dong)態密(mi)封(feng)系(xi)統的(de)設(she)計，開始使用(yong)了更加復雜(za)的(de)U型(xing)圈和(he)同軸(zhou)密(mi)封(feng)組件的(de)復合式設(she)計。密(mi)封(feng)的(de)靜(jing)(jing)環(huan)(huan)(huan)(huan)(huan)通常固定在(zai)殼體上(shang)，動(dong)(dong)(dong)(dong)環(huan)(huan)(huan)(huan)(huan)通過(guo)彈(dan)簧、彈(dan)簧座與(yu)(yu)軸(zhou)一(yi)(yi)同旋轉。靜(jing)(jing)環(huan)(huan)(huan)(huan)(huan)與(yu)(yu)殼體、動(dong)(dong)(dong)(dong)環(huan)(huan)(huan)(huan)(huan)與(yu)(yu)軸(zhou)形成的(de)間(jian)隙用(yong)成型(xing)填料密(mi)封(feng)。在(zai)動(dong)(dong)(dong)(dong)環(huan)(huan)(huan)(huan)(huan)和(he)靜(jing)(jing)環(huan)(huan)(huan)(huan)(huan)接觸(chu)的(de)端面形成相對滑動(dong)(dong)(dong)(dong)面，即(ji)動(dong)(dong)(dong)(dong)密(mi)封(feng)面。為保證密(mi)封(feng)良(liang)好，動(dong)(dong)(dong)(dong)密(mi)封(feng)面應十分平直和(he)光潔。彈(dan)簧力(li)和(he)被密(mi)封(feng)的(de)流體壓(ya)力(li)使動(dong)(dong)(dong)(dong)環(huan)(huan)(huan)(huan)(huan)貼緊靜(jing)(jing)環(huan)(huan)(huan)(huan)(huan)。因動(dong)(dong)(dong)(dong)環(huan)(huan)(huan)(huan)(huan)與(yu)(yu)軸(zhou)通過(guo)彈(dan)簧連(lian)接，動(dong)(dong)(dong)(dong)環(huan)(huan)(huan)(huan)(huan)和(he)靜(jing)(jing)環(huan)(huan)(huan)(huan)(huan)間(jian)貼合性受軸(zhou)的(de)振動(dong)(dong)(dong)(dong)和(he)擺動(dong)(dong)(dong)(dong)影(ying)響較小。靜(jing)(jing)環(huan)(huan)(huan)(huan)(huan)一(yi)(yi)般常用(yong)潤滑性好的(de)軟質材(cai)料如(ru)石墨(mo)、填充聚四(si)氟(fu)乙烯等，動(dong)(dong)(dong)(dong)環(huan)(huan)(huan)(huan)(huan)多(duo)用(yong)硬質合金(jin)、陶瓷等材(cai)料制造。