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。渣漿沅陵泵用沅陵機械密封的工作原理要求沅陵機械密封內部無任何雜質，在組裝沅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沅陵機械密封嚴重漏泄。必(bi)要時可以制(zhi)作工裝(zhuang)在(zai)組(zu)裝(zhuang)前水壓試驗，檢(jian)查動靜環座是否存在(zai)影響密封的缺陷(xian)。

　　渣漿沅陵泵用沅陵機械密封由于密封面變形所引起的，而且沅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沅陵泵用沅陵機械密封泄漏，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沅陵機械密封的(de)變(bian)形(xing)情(qing)況。如果(guo)發生變(bian)形(xing)，用(yong)平(ping)晶檢查密封面的(de)干涉帶的(de)變(bian)化(hua)情(qing)況，密封面變(bian)形(xing)存在(zai)于動環和靜環之間。

　　壓缸體(ti)(ti)(ti)動(dong)(dong)(dong)(dong)(dong)態(tai)密(mi)(mi)封(feng)系(xi)(xi)統(tong)采用(yong)的是主密(mi)(mi)封(feng)設計，一般(ban)(ban)都用(yong)U型(xing)密(mi)(mi)封(feng)圈。液壓缸體(ti)(ti)(ti)的往復(fu)式(shi)動(dong)(dong)(dong)(dong)(dong)態(tai)密(mi)(mi)封(feng)系(xi)(xi)統(tong)的設計，開始使用(yong)了(le)更加(jia)復(fu)雜的U型(xing)圈和(he)(he)同軸密(mi)(mi)封(feng)組件的復(fu)合(he)式(shi)設計。密(mi)(mi)封(feng)的靜(jing)環(huan)(huan)通常固定在(zai)殼體(ti)(ti)(ti)上，動(dong)(dong)(dong)(dong)(dong)環(huan)(huan)通過彈簧(huang)(huang)、彈簧(huang)(huang)座(zuo)與(yu)軸一同旋轉。靜(jing)環(huan)(huan)與(yu)殼體(ti)(ti)(ti)、動(dong)(dong)(dong)(dong)(dong)環(huan)(huan)與(yu)軸形(xing)成的間隙用(yong)成型(xing)填料密(mi)(mi)封(feng)。在(zai)動(dong)(dong)(dong)(dong)(dong)環(huan)(huan)和(he)(he)靜(jing)環(huan)(huan)接觸的端面形(xing)成相對(dui)滑(hua)動(dong)(dong)(dong)(dong)(dong)面，即動(dong)(dong)(dong)(dong)(dong)密(mi)(mi)封(feng)面。為(wei)保證密(mi)(mi)封(feng)良好，動(dong)(dong)(dong)(dong)(dong)密(mi)(mi)封(feng)面應十分平直(zhi)和(he)(he)光潔。彈簧(huang)(huang)力和(he)(he)被(bei)密(mi)(mi)封(feng)的流體(ti)(ti)(ti)壓力使動(dong)(dong)(dong)(dong)(dong)環(huan)(huan)貼緊靜(jing)環(huan)(huan)。因動(dong)(dong)(dong)(dong)(dong)環(huan)(huan)與(yu)軸通過彈簧(huang)(huang)連接，動(dong)(dong)(dong)(dong)(dong)環(huan)(huan)和(he)(he)靜(jing)環(huan)(huan)間貼合(he)性受軸的振動(dong)(dong)(dong)(dong)(dong)和(he)(he)擺動(dong)(dong)(dong)(dong)(dong)影響較小。靜(jing)環(huan)(huan)一般(ban)(ban)常用(yong)潤(run)滑(hua)性好的軟(ruan)質(zhi)材(cai)料如(ru)石(shi)墨、填充聚四氟(fu)乙烯等，動(dong)(dong)(dong)(dong)(dong)環(huan)(huan)多(duo)用(yong)硬質(zhi)合(he)金、陶瓷等材(cai)料制造。