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。渣漿泵用泗水機械密封的工作原理要求泗水機械密封內部無任何雜質，在組裝泗水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泗水機械密封嚴重漏(lou)泄。必要時可以制作工(gong)裝(zhuang)(zhuang)在組裝(zhuang)(zhuang)前水(shui)壓試驗(yan)，檢查動靜環座是否存(cun)在影響密封的缺陷(xian)。

　　渣漿泗水泵用泗水機械密封由于密封面變形所引起的，而且泗水機械密封面泄漏的概率是很高的。如果泵在啟動時就發生泗水泵用泗水機械密封泄漏，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泗水機械密封的(de)變(bian)(bian)形情況。如果發生(sheng)變(bian)(bian)形，用平晶檢查密封面(mian)的(de)干涉帶(dai)的(de)變(bian)(bian)化情況，密封面(mian)變(bian)(bian)形存在于動環(huan)和(he)靜環(huan)之(zhi)間。

　　壓缸體(ti)動(dong)(dong)態密(mi)封(feng)(feng)系(xi)統采(cai)用(yong)(yong)(yong)的(de)是主密(mi)封(feng)(feng)設計，一般都用(yong)(yong)(yong)U型密(mi)封(feng)(feng)圈。液壓缸體(ti)的(de)往復式動(dong)(dong)態密(mi)封(feng)(feng)系(xi)統的(de)設計，開始(shi)使用(yong)(yong)(yong)了更加復雜的(de)U型圈和(he)同軸(zhou)密(mi)封(feng)(feng)組件的(de)復合(he)式設計。密(mi)封(feng)(feng)的(de)靜(jing)(jing)環(huan)(huan)(huan)(huan)(huan)通(tong)(tong)常固(gu)定在(zai)殼體(ti)上，動(dong)(dong)環(huan)(huan)(huan)(huan)(huan)通(tong)(tong)過彈簧(huang)、彈簧(huang)座與軸(zhou)一同旋轉。靜(jing)(jing)環(huan)(huan)(huan)(huan)(huan)與殼體(ti)、動(dong)(dong)環(huan)(huan)(huan)(huan)(huan)與軸(zhou)形(xing)成的(de)間隙用(yong)(yong)(yong)成型填料密(mi)封(feng)(feng)。在(zai)動(dong)(dong)環(huan)(huan)(huan)(huan)(huan)和(he)靜(jing)(jing)環(huan)(huan)(huan)(huan)(huan)接觸的(de)端面形(xing)成相(xiang)對滑(hua)動(dong)(dong)面，即(ji)動(dong)(dong)密(mi)封(feng)(feng)面。為保證(zheng)密(mi)封(feng)(feng)良好(hao)，動(dong)(dong)密(mi)封(feng)(feng)面應(ying)十分(fen)平直(zhi)和(he)光潔。彈簧(huang)力和(he)被密(mi)封(feng)(feng)的(de)流體(ti)壓力使動(dong)(dong)環(huan)(huan)(huan)(huan)(huan)貼緊靜(jing)(jing)環(huan)(huan)(huan)(huan)(huan)。因動(dong)(dong)環(huan)(huan)(huan)(huan)(huan)與軸(zhou)通(tong)(tong)過彈簧(huang)連接，動(dong)(dong)環(huan)(huan)(huan)(huan)(huan)和(he)靜(jing)(jing)環(huan)(huan)(huan)(huan)(huan)間貼合(he)性受軸(zhou)的(de)振(zhen)動(dong)(dong)和(he)擺(bai)動(dong)(dong)影響較小。靜(jing)(jing)環(huan)(huan)(huan)(huan)(huan)一般常用(yong)(yong)(yong)潤滑(hua)性好(hao)的(de)軟質(zhi)材料如石墨(mo)、填充聚四氟乙烯等(deng)，動(dong)(dong)環(huan)(huan)(huan)(huan)(huan)多用(yong)(yong)(yong)硬質(zhi)合(he)金、陶瓷等(deng)材料制造。