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。渣漿南票泵用南票機械密封的工作原理要求南票機械密封內部無任何雜質，在組裝南票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南票機械密封嚴(yan)重漏泄。必(bi)要時可(ke)以制作工裝在(zai)組裝前水壓試驗，檢查動靜(jing)環座是(shi)否存在(zai)影響密(mi)封的缺陷。

　　渣漿南票泵用南票機械密封由于密封面變形所引起的，而且南票機械密封面泄漏的概率是很高的。如果泵在啟動時就發生南票泵用南票機械密封泄漏，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南票機械密封的(de)變(bian)(bian)(bian)形情況。如果(guo)發生變(bian)(bian)(bian)形，用(yong)平(ping)晶檢查密(mi)封面的(de)干涉帶的(de)變(bian)(bian)(bian)化情況，密(mi)封面變(bian)(bian)(bian)形存在于動環(huan)和靜環(huan)之間(jian)。

　　壓缸(gang)體(ti)動(dong)(dong)(dong)(dong)態密(mi)(mi)(mi)(mi)封(feng)系(xi)(xi)統采(cai)用(yong)的(de)(de)(de)(de)(de)是主密(mi)(mi)(mi)(mi)封(feng)設(she)計，一(yi)般(ban)都用(yong)U型密(mi)(mi)(mi)(mi)封(feng)圈。液(ye)壓缸(gang)體(ti)的(de)(de)(de)(de)(de)往復(fu)式(shi)動(dong)(dong)(dong)(dong)態密(mi)(mi)(mi)(mi)封(feng)系(xi)(xi)統的(de)(de)(de)(de)(de)設(she)計，開始使用(yong)了更(geng)加復(fu)雜的(de)(de)(de)(de)(de)U型圈和同軸密(mi)(mi)(mi)(mi)封(feng)組(zu)件的(de)(de)(de)(de)(de)復(fu)合式(shi)設(she)計。密(mi)(mi)(mi)(mi)封(feng)的(de)(de)(de)(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(dan)簧、彈(dan)簧座與(yu)(yu)(yu)軸一(yi)同旋轉。靜(jing)(jing)環(huan)(huan)(huan)(huan)(huan)與(yu)(yu)(yu)殼(ke)體(ti)、動(dong)(dong)(dong)(dong)環(huan)(huan)(huan)(huan)(huan)與(yu)(yu)(yu)軸形成(cheng)(cheng)的(de)(de)(de)(de)(de)間(jian)隙用(yong)成(cheng)(cheng)型填料(liao)密(mi)(mi)(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)(de)(de)(de)端面(mian)形成(cheng)(cheng)相對滑動(dong)(dong)(dong)(dong)面(mian)，即動(dong)(dong)(dong)(dong)密(mi)(mi)(mi)(mi)封(feng)面(mian)。為保證(zheng)密(mi)(mi)(mi)(mi)封(feng)良好，動(dong)(dong)(dong)(dong)密(mi)(mi)(mi)(mi)封(feng)面(mian)應(ying)十分平直和光潔。彈(dan)簧力和被密(mi)(mi)(mi)(mi)封(feng)的(de)(de)(de)(de)(de)流(liu)體(ti)壓力使動(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)(yu)軸通過彈(dan)簧連接，動(dong)(dong)(dong)(dong)環(huan)(huan)(huan)(huan)(huan)和靜(jing)(jing)環(huan)(huan)(huan)(huan)(huan)間(jian)貼合性(xing)(xing)受軸的(de)(de)(de)(de)(de)振(zhen)動(dong)(dong)(dong)(dong)和擺動(dong)(dong)(dong)(dong)影(ying)響較小。靜(jing)(jing)環(huan)(huan)(huan)(huan)(huan)一(yi)般(ban)常用(yong)潤滑性(xing)(xing)好的(de)(de)(de)(de)(de)軟質材料(liao)如石墨、填充聚(ju)四氟(fu)乙(yi)烯等，動(dong)(dong)(dong)(dong)環(huan)(huan)(huan)(huan)(huan)多用(yong)硬質合金(jin)、陶瓷等材料(liao)制造。