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。渣漿泵用瑪多機械密封的工作原理要求瑪多機械密封內部無任何雜質，在組裝瑪多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瑪多機械密封嚴重漏泄。必要時可以制作工裝(zhuang)在(zai)組裝(zhuang)前水壓試(shi)驗，檢(jian)查(cha)動靜環座是否(fou)存(cun)在(zai)影響(xiang)密封的缺(que)陷。

　　渣漿瑪多泵用瑪多機械密封由于密封面變形所引起的，而且瑪多機械密封面泄漏的概率是很高的。如果泵在啟動時就發生瑪多泵用瑪多機械密封泄漏，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瑪多機械密封的(de)變(bian)(bian)形(xing)情(qing)況(kuang)。如果發生變(bian)(bian)形(xing)，用平晶檢(jian)查(cha)密封面的(de)干涉帶的(de)變(bian)(bian)化(hua)情(qing)況(kuang)，密封面變(bian)(bian)形(xing)存(cun)在(zai)于(yu)動環和(he)靜環之間(jian)。

　　壓(ya)缸(gang)體(ti)動(dong)(dong)(dong)態(tai)密(mi)(mi)(mi)(mi)封(feng)系(xi)統采用(yong)(yong)的(de)(de)(de)是主密(mi)(mi)(mi)(mi)封(feng)設(she)(she)計(ji)，一(yi)般都用(yong)(yong)U型(xing)(xing)密(mi)(mi)(mi)(mi)封(feng)圈。液壓(ya)缸(gang)體(ti)的(de)(de)(de)往復式(shi)動(dong)(dong)(dong)態(tai)密(mi)(mi)(mi)(mi)封(feng)系(xi)統的(de)(de)(de)設(she)(she)計(ji)，開始使用(yong)(yong)了更加復雜的(de)(de)(de)U型(xing)(xing)圈和(he)同軸密(mi)(mi)(mi)(mi)封(feng)組件的(de)(de)(de)復合(he)式(shi)設(she)(she)計(ji)。密(mi)(mi)(mi)(mi)封(feng)的(de)(de)(de)靜(jing)(jing)環(huan)(huan)(huan)通(tong)常固定(ding)在殼體(ti)上，動(dong)(dong)(dong)環(huan)(huan)(huan)通(tong)過(guo)彈簧(huang)(huang)、彈簧(huang)(huang)座(zuo)與軸一(yi)同旋轉。靜(jing)(jing)環(huan)(huan)(huan)與殼體(ti)、動(dong)(dong)(dong)環(huan)(huan)(huan)與軸形(xing)成的(de)(de)(de)間(jian)隙用(yong)(yong)成型(xing)(xing)填(tian)料密(mi)(mi)(mi)(mi)封(feng)。在動(dong)(dong)(dong)環(huan)(huan)(huan)和(he)靜(jing)(jing)環(huan)(huan)(huan)接(jie)觸(chu)的(de)(de)(de)端面(mian)(mian)形(xing)成相對(dui)滑動(dong)(dong)(dong)面(mian)(mian)，即動(dong)(dong)(dong)密(mi)(mi)(mi)(mi)封(feng)面(mian)(mian)。為保證密(mi)(mi)(mi)(mi)封(feng)良好，動(dong)(dong)(dong)密(mi)(mi)(mi)(mi)封(feng)面(mian)(mian)應十(shi)分平直和(he)光(guang)潔。彈簧(huang)(huang)力和(he)被密(mi)(mi)(mi)(mi)封(feng)的(de)(de)(de)流體(ti)壓(ya)力使動(dong)(dong)(dong)環(huan)(huan)(huan)貼(tie)緊靜(jing)(jing)環(huan)(huan)(huan)。因動(dong)(dong)(dong)環(huan)(huan)(huan)與軸通(tong)過(guo)彈簧(huang)(huang)連接(jie)，動(dong)(dong)(dong)環(huan)(huan)(huan)和(he)靜(jing)(jing)環(huan)(huan)(huan)間(jian)貼(tie)合(he)性受軸的(de)(de)(de)振動(dong)(dong)(dong)和(he)擺動(dong)(dong)(dong)影響(xiang)較小。靜(jing)(jing)環(huan)(huan)(huan)一(yi)般常用(yong)(yong)潤滑性好的(de)(de)(de)軟質材(cai)料如石墨、填(tian)充聚四氟乙烯等，動(dong)(dong)(dong)環(huan)(huan)(huan)多用(yong)(yong)硬(ying)質合(he)金、陶瓷等材(cai)料制(zhi)造。