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。渣漿瑪多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(yao)時(shi)可以制作工裝(zhuang)在(zai)組裝(zhuang)前水壓試驗，檢查動靜環座是否(fou)存在(zai)影響(xiang)密封的缺陷。

　　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變形(xing)情況(kuang)。如果發生變形(xing)，用平晶檢查密封面的干(gan)涉(she)帶的變化情況(kuang)，密封面變形(xing)存在(zai)于動環和(he)靜(jing)環之(zhi)間。

　　壓缸體動(dong)(dong)(dong)(dong)(dong)(dong)態密(mi)(mi)(mi)封(feng)(feng)系統采用(yong)的(de)(de)(de)(de)是(shi)主密(mi)(mi)(mi)封(feng)(feng)設計，一般(ban)都用(yong)U型密(mi)(mi)(mi)封(feng)(feng)圈。液壓缸體的(de)(de)(de)(de)往復(fu)式動(dong)(dong)(dong)(dong)(dong)(dong)態密(mi)(mi)(mi)封(feng)(feng)系統的(de)(de)(de)(de)設計，開始使用(yong)了更(geng)加復(fu)雜的(de)(de)(de)(de)U型圈和(he)(he)同(tong)軸(zhou)密(mi)(mi)(mi)封(feng)(feng)組件(jian)的(de)(de)(de)(de)復(fu)合(he)式設計。密(mi)(mi)(mi)封(feng)(feng)的(de)(de)(de)(de)靜(jing)環(huan)(huan)通常固定在(zai)殼體上，動(dong)(dong)(dong)(dong)(dong)(dong)環(huan)(huan)通過(guo)彈(dan)簧(huang)、彈(dan)簧(huang)座與軸(zhou)一同(tong)旋轉。靜(jing)環(huan)(huan)與殼體、動(dong)(dong)(dong)(dong)(dong)(dong)環(huan)(huan)與軸(zhou)形成的(de)(de)(de)(de)間(jian)隙用(yong)成型填料密(mi)(mi)(mi)封(feng)(feng)。在(zai)動(dong)(dong)(dong)(dong)(dong)(dong)環(huan)(huan)和(he)(he)靜(jing)環(huan)(huan)接觸的(de)(de)(de)(de)端面形成相對滑(hua)動(dong)(dong)(dong)(dong)(dong)(dong)面，即(ji)動(dong)(dong)(dong)(dong)(dong)(dong)密(mi)(mi)(mi)封(feng)(feng)面。為保證密(mi)(mi)(mi)封(feng)(feng)良好，動(dong)(dong)(dong)(dong)(dong)(dong)密(mi)(mi)(mi)封(feng)(feng)面應十分平直(zhi)和(he)(he)光潔。彈(dan)簧(huang)力和(he)(he)被密(mi)(mi)(mi)封(feng)(feng)的(de)(de)(de)(de)流(liu)體壓力使動(dong)(dong)(dong)(dong)(dong)(dong)環(huan)(huan)貼緊靜(jing)環(huan)(huan)。因動(dong)(dong)(dong)(dong)(dong)(dong)環(huan)(huan)與軸(zhou)通過(guo)彈(dan)簧(huang)連接，動(dong)(dong)(dong)(dong)(dong)(dong)環(huan)(huan)和(he)(he)靜(jing)環(huan)(huan)間(jian)貼合(he)性受軸(zhou)的(de)(de)(de)(de)振動(dong)(dong)(dong)(dong)(dong)(dong)和(he)(he)擺動(dong)(dong)(dong)(dong)(dong)(dong)影(ying)響(xiang)較小。靜(jing)環(huan)(huan)一般(ban)常用(yong)潤滑(hua)性好的(de)(de)(de)(de)軟(ruan)質材料如石墨(mo)、填充(chong)聚四氟乙烯等，動(dong)(dong)(dong)(dong)(dong)(dong)環(huan)(huan)多(duo)用(yong)硬質合(he)金、陶瓷等材料制(zhi)造。