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。渣漿大冶泵用大冶機械密封的工作原理要求大冶機械密封內部無任何雜質，在組裝大冶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大冶機械密封嚴(yan)重漏泄。必要時可以制(zhi)作(zuo)工裝(zhuang)在組裝(zhuang)前水壓(ya)試驗，檢查(cha)動靜(jing)環座是否存在影響(xiang)密封的缺陷(xian)。

　　渣漿大冶泵用大冶機械密封由于密封面變形所引起的，而且大冶機械密封面泄漏的概率是很高的。如果泵在啟動時就發生大冶泵用大冶機械密封泄漏，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大冶機械密封的變(bian)形情(qing)況。如果發生變(bian)形，用平晶檢(jian)查密封(feng)面的干涉帶的變(bian)化情(qing)況，密封(feng)面變(bian)形存在于(yu)動環和(he)靜環之間。

　　壓缸體(ti)動(dong)(dong)(dong)(dong)(dong)(dong)態密(mi)(mi)封(feng)(feng)系統(tong)采用(yong)(yong)的(de)是(shi)主密(mi)(mi)封(feng)(feng)設(she)計，一般都用(yong)(yong)U型密(mi)(mi)封(feng)(feng)圈(quan)。液壓缸體(ti)的(de)往復(fu)(fu)式動(dong)(dong)(dong)(dong)(dong)(dong)態密(mi)(mi)封(feng)(feng)系統(tong)的(de)設(she)計，開始使用(yong)(yong)了更加復(fu)(fu)雜的(de)U型圈(quan)和(he)同軸(zhou)(zhou)密(mi)(mi)封(feng)(feng)組(zu)件的(de)復(fu)(fu)合式設(she)計。密(mi)(mi)封(feng)(feng)的(de)靜(jing)環(huan)(huan)(huan)(huan)(huan)通常固定在(zai)殼(ke)體(ti)上，動(dong)(dong)(dong)(dong)(dong)(dong)環(huan)(huan)(huan)(huan)(huan)通過彈(dan)簧、彈(dan)簧座與(yu)(yu)軸(zhou)(zhou)一同旋轉。靜(jing)環(huan)(huan)(huan)(huan)(huan)與(yu)(yu)殼(ke)體(ti)、動(dong)(dong)(dong)(dong)(dong)(dong)環(huan)(huan)(huan)(huan)(huan)與(yu)(yu)軸(zhou)(zhou)形成的(de)間(jian)隙用(yong)(yong)成型填料(liao)密(mi)(mi)封(feng)(feng)。在(zai)動(dong)(dong)(dong)(dong)(dong)(dong)環(huan)(huan)(huan)(huan)(huan)和(he)靜(jing)環(huan)(huan)(huan)(huan)(huan)接(jie)觸的(de)端面形成相對滑動(dong)(dong)(dong)(dong)(dong)(dong)面，即動(dong)(dong)(dong)(dong)(dong)(dong)密(mi)(mi)封(feng)(feng)面。為保證密(mi)(mi)封(feng)(feng)良(liang)好(hao)，動(dong)(dong)(dong)(dong)(dong)(dong)密(mi)(mi)封(feng)(feng)面應十分平直和(he)光潔。彈(dan)簧力和(he)被密(mi)(mi)封(feng)(feng)的(de)流體(ti)壓力使動(dong)(dong)(dong)(dong)(dong)(dong)環(huan)(huan)(huan)(huan)(huan)貼緊靜(jing)環(huan)(huan)(huan)(huan)(huan)。因動(dong)(dong)(dong)(dong)(dong)(dong)環(huan)(huan)(huan)(huan)(huan)與(yu)(yu)軸(zhou)(zhou)通過彈(dan)簧連(lian)接(jie)，動(dong)(dong)(dong)(dong)(dong)(dong)環(huan)(huan)(huan)(huan)(huan)和(he)靜(jing)環(huan)(huan)(huan)(huan)(huan)間(jian)貼合性(xing)受軸(zhou)(zhou)的(de)振動(dong)(dong)(dong)(dong)(dong)(dong)和(he)擺動(dong)(dong)(dong)(dong)(dong)(dong)影(ying)響較小。靜(jing)環(huan)(huan)(huan)(huan)(huan)一般常用(yong)(yong)潤滑性(xing)好(hao)的(de)軟質(zhi)(zhi)材(cai)(cai)料(liao)如石墨、填充(chong)聚四氟乙(yi)烯等，動(dong)(dong)(dong)(dong)(dong)(dong)環(huan)(huan)(huan)(huan)(huan)多用(yong)(yong)硬質(zhi)(zhi)合金、陶瓷等材(cai)(cai)料(liao)制造。