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。渣漿泵用新縣機械密封的工作原理要求新縣機械密封內部無任何雜質，在組裝新縣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新縣機械密封嚴(yan)重漏泄(xie)。必要時可(ke)以制(zhi)作工裝(zhuang)在(zai)組裝(zhuang)前水(shui)壓試驗，檢(jian)查動靜環座是否存在(zai)影響密封的缺陷(xian)。

　　渣漿新縣泵用新縣機械密封由于密封面變形所引起的，而且新縣機械密封面泄漏的概率是很高的。如果泵在啟動時就發生新縣泵用新縣機械密封泄漏，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新縣機械密封的(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)干涉帶的(de)變(bian)(bian)化情況，密封面(mian)變(bian)(bian)形存在于動環和靜環之間。

　　壓(ya)缸體(ti)動(dong)(dong)(dong)(dong)態密(mi)(mi)封(feng)系統(tong)采用(yong)的(de)(de)是(shi)主(zhu)密(mi)(mi)封(feng)設計，一(yi)般都(dou)用(yong)U型(xing)密(mi)(mi)封(feng)圈。液壓(ya)缸體(ti)的(de)(de)往復式動(dong)(dong)(dong)(dong)態密(mi)(mi)封(feng)系統(tong)的(de)(de)設計，開始使(shi)用(yong)了更(geng)加復雜的(de)(de)U型(xing)圈和同軸(zhou)密(mi)(mi)封(feng)組件的(de)(de)復合式設計。密(mi)(mi)封(feng)的(de)(de)靜(jing)(jing)環(huan)(huan)(huan)(huan)(huan)通常固定在殼(ke)體(ti)上，動(dong)(dong)(dong)(dong)環(huan)(huan)(huan)(huan)(huan)通過彈簧(huang)、彈簧(huang)座與(yu)軸(zhou)一(yi)同旋轉。靜(jing)(jing)環(huan)(huan)(huan)(huan)(huan)與(yu)殼(ke)體(ti)、動(dong)(dong)(dong)(dong)環(huan)(huan)(huan)(huan)(huan)與(yu)軸(zhou)形成的(de)(de)間隙用(yong)成型(xing)填(tian)料密(mi)(mi)封(feng)。在動(dong)(dong)(dong)(dong)環(huan)(huan)(huan)(huan)(huan)和靜(jing)(jing)環(huan)(huan)(huan)(huan)(huan)接觸的(de)(de)端面(mian)(mian)形成相對滑動(dong)(dong)(dong)(dong)面(mian)(mian)，即動(dong)(dong)(dong)(dong)密(mi)(mi)封(feng)面(mian)(mian)。為保(bao)證密(mi)(mi)封(feng)良(liang)好(hao)(hao)，動(dong)(dong)(dong)(dong)密(mi)(mi)封(feng)面(mian)(mian)應十分平(ping)直和光潔。彈簧(huang)力和被密(mi)(mi)封(feng)的(de)(de)流體(ti)壓(ya)力使(shi)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)軸(zhou)通過彈簧(huang)連接，動(dong)(dong)(dong)(dong)環(huan)(huan)(huan)(huan)(huan)和靜(jing)(jing)環(huan)(huan)(huan)(huan)(huan)間貼合性受軸(zhou)的(de)(de)振動(dong)(dong)(dong)(dong)和擺動(dong)(dong)(dong)(dong)影響較小。靜(jing)(jing)環(huan)(huan)(huan)(huan)(huan)一(yi)般常用(yong)潤(run)滑性好(hao)(hao)的(de)(de)軟質材料如石(shi)墨、填(tian)充聚四(si)氟乙(yi)烯等，動(dong)(dong)(dong)(dong)環(huan)(huan)(huan)(huan)(huan)多用(yong)硬(ying)質合金、陶瓷等材料制造。