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。渣漿泵用成都機械密封的工作原理要求成都機械密封內部無任何雜質，在組裝成都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成都機械密封嚴重(zhong)漏泄。必要時可(ke)以制作(zuo)工(gong)裝在組裝前(qian)水壓試驗(yan)，檢查(cha)動(dong)靜環座(zuo)是否存在影響密封的缺陷(xian)。

　　渣漿成都泵用成都機械密封由于密封面變形所引起的，而且成都機械密封面泄漏的概率是很高的。如果泵在啟動時就發生成都泵用成都機械密封泄漏，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成都機械密封的(de)變(bian)形情況(kuang)。如果發生變(bian)形，用(yong)平(ping)晶檢查(cha)密(mi)封面的(de)干(gan)涉帶的(de)變(bian)化情況(kuang)，密(mi)封面變(bian)形存在(zai)于動環(huan)和靜環(huan)之間(jian)。

　　壓缸(gang)體動(dong)(dong)(dong)(dong)態密(mi)(mi)(mi)封(feng)(feng)(feng)系(xi)統采(cai)用(yong)(yong)的(de)(de)(de)(de)是主密(mi)(mi)(mi)封(feng)(feng)(feng)設(she)(she)計(ji)，一般都用(yong)(yong)U型(xing)密(mi)(mi)(mi)封(feng)(feng)(feng)圈(quan)。液(ye)壓缸(gang)體的(de)(de)(de)(de)往復式動(dong)(dong)(dong)(dong)態密(mi)(mi)(mi)封(feng)(feng)(feng)系(xi)統的(de)(de)(de)(de)設(she)(she)計(ji)，開始使(shi)用(yong)(yong)了更(geng)加(jia)復雜的(de)(de)(de)(de)U型(xing)圈(quan)和(he)(he)同軸(zhou)密(mi)(mi)(mi)封(feng)(feng)(feng)組件的(de)(de)(de)(de)復合式設(she)(she)計(ji)。密(mi)(mi)(mi)封(feng)(feng)(feng)的(de)(de)(de)(de)靜環(huan)(huan)(huan)(huan)(huan)通(tong)常固定(ding)在殼(ke)(ke)體上，動(dong)(dong)(dong)(dong)環(huan)(huan)(huan)(huan)(huan)通(tong)過(guo)(guo)彈(dan)(dan)簧、彈(dan)(dan)簧座與軸(zhou)一同旋轉(zhuan)。靜環(huan)(huan)(huan)(huan)(huan)與殼(ke)(ke)體、動(dong)(dong)(dong)(dong)環(huan)(huan)(huan)(huan)(huan)與軸(zhou)形(xing)成的(de)(de)(de)(de)間隙用(yong)(yong)成型(xing)填料密(mi)(mi)(mi)封(feng)(feng)(feng)。在動(dong)(dong)(dong)(dong)環(huan)(huan)(huan)(huan)(huan)和(he)(he)靜環(huan)(huan)(huan)(huan)(huan)接觸的(de)(de)(de)(de)端(duan)面形(xing)成相對滑動(dong)(dong)(dong)(dong)面，即(ji)動(dong)(dong)(dong)(dong)密(mi)(mi)(mi)封(feng)(feng)(feng)面。為保證(zheng)密(mi)(mi)(mi)封(feng)(feng)(feng)良好，動(dong)(dong)(dong)(dong)密(mi)(mi)(mi)封(feng)(feng)(feng)面應十分平直和(he)(he)光潔。彈(dan)(dan)簧力和(he)(he)被密(mi)(mi)(mi)封(feng)(feng)(feng)的(de)(de)(de)(de)流體壓力使(shi)動(dong)(dong)(dong)(dong)環(huan)(huan)(huan)(huan)(huan)貼緊(jin)靜環(huan)(huan)(huan)(huan)(huan)。因動(dong)(dong)(dong)(dong)環(huan)(huan)(huan)(huan)(huan)與軸(zhou)通(tong)過(guo)(guo)彈(dan)(dan)簧連接，動(dong)(dong)(dong)(dong)環(huan)(huan)(huan)(huan)(huan)和(he)(he)靜環(huan)(huan)(huan)(huan)(huan)間貼合性受軸(zhou)的(de)(de)(de)(de)振動(dong)(dong)(dong)(dong)和(he)(he)擺動(dong)(dong)(dong)(dong)影響較小。靜環(huan)(huan)(huan)(huan)(huan)一般常用(yong)(yong)潤(run)滑性好的(de)(de)(de)(de)軟質(zhi)材料如石墨、填充(chong)聚(ju)四氟乙烯等，動(dong)(dong)(dong)(dong)環(huan)(huan)(huan)(huan)(huan)多(duo)用(yong)(yong)硬質(zhi)合金、陶(tao)瓷等材料制造(zao)。