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。渣漿泵用長嶺機械密封的工作原理要求長嶺機械密封內部無任何雜質，在組裝長嶺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長嶺機械密封嚴重漏泄。必要時可(ke)以制作工(gong)裝(zhuang)在組裝(zhuang)前水(shui)壓試驗，檢查動靜(jing)環座(zuo)是(shi)否(fou)存在影響密封的缺陷。

　　渣漿長嶺泵用長嶺機械密封由于密封面變形所引起的，而且長嶺機械密封面泄漏的概率是很高的。如果泵在啟動時就發生長嶺泵用長嶺機械密封泄漏，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長嶺機械密封的(de)(de)變形情(qing)況。如果發生變形，用平晶檢查密封(feng)面(mian)的(de)(de)干(gan)涉(she)帶(dai)的(de)(de)變化(hua)情(qing)況，密封(feng)面(mian)變形存在于動(dong)環(huan)和靜環(huan)之間。

　　壓缸體(ti)動(dong)(dong)(dong)(dong)態密(mi)(mi)(mi)封(feng)系(xi)統采(cai)用(yong)的(de)(de)是主密(mi)(mi)(mi)封(feng)設計(ji)，一般(ban)都用(yong)U型密(mi)(mi)(mi)封(feng)圈。液壓缸體(ti)的(de)(de)往復式(shi)動(dong)(dong)(dong)(dong)態密(mi)(mi)(mi)封(feng)系(xi)統的(de)(de)設計(ji)，開始(shi)使(shi)用(yong)了更(geng)加復雜的(de)(de)U型圈和(he)同軸(zhou)密(mi)(mi)(mi)封(feng)組件的(de)(de)復合式(shi)設計(ji)。密(mi)(mi)(mi)封(feng)的(de)(de)靜(jing)(jing)環(huan)(huan)(huan)通常固定在殼(ke)體(ti)上，動(dong)(dong)(dong)(dong)環(huan)(huan)(huan)通過彈(dan)簧(huang)、彈(dan)簧(huang)座與(yu)軸(zhou)一同旋轉。靜(jing)(jing)環(huan)(huan)(huan)與(yu)殼(ke)體(ti)、動(dong)(dong)(dong)(dong)環(huan)(huan)(huan)與(yu)軸(zhou)形成(cheng)的(de)(de)間(jian)(jian)隙用(yong)成(cheng)型填(tian)料(liao)(liao)密(mi)(mi)(mi)封(feng)。在動(dong)(dong)(dong)(dong)環(huan)(huan)(huan)和(he)靜(jing)(jing)環(huan)(huan)(huan)接觸的(de)(de)端面形成(cheng)相對滑動(dong)(dong)(dong)(dong)面，即動(dong)(dong)(dong)(dong)密(mi)(mi)(mi)封(feng)面。為(wei)保證密(mi)(mi)(mi)封(feng)良好(hao)，動(dong)(dong)(dong)(dong)密(mi)(mi)(mi)封(feng)面應(ying)十分平直和(he)光潔(jie)。彈(dan)簧(huang)力(li)和(he)被密(mi)(mi)(mi)封(feng)的(de)(de)流體(ti)壓力(li)使(shi)動(dong)(dong)(dong)(dong)環(huan)(huan)(huan)貼(tie)(tie)緊靜(jing)(jing)環(huan)(huan)(huan)。因(yin)動(dong)(dong)(dong)(dong)環(huan)(huan)(huan)與(yu)軸(zhou)通過彈(dan)簧(huang)連接，動(dong)(dong)(dong)(dong)環(huan)(huan)(huan)和(he)靜(jing)(jing)環(huan)(huan)(huan)間(jian)(jian)貼(tie)(tie)合性受軸(zhou)的(de)(de)振(zhen)動(dong)(dong)(dong)(dong)和(he)擺動(dong)(dong)(dong)(dong)影響較小。靜(jing)(jing)環(huan)(huan)(huan)一般(ban)常用(yong)潤滑性好(hao)的(de)(de)軟質材(cai)(cai)料(liao)(liao)如(ru)石墨、填(tian)充聚四氟乙(yi)烯(xi)等，動(dong)(dong)(dong)(dong)環(huan)(huan)(huan)多用(yong)硬(ying)質合金、陶瓷等材(cai)(cai)料(liao)(liao)制造。