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。渣漿泵用蘆山機械密封的工作原理要求蘆山機械密封內部無任何雜質，在組裝蘆山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蘆山機械密封嚴重漏泄(xie)。必要時(shi)可以制作工裝在(zai)組裝前水(shui)壓(ya)試驗(yan)，檢查動靜環座是否存在(zai)影響密封的缺陷。

　　渣漿蘆山泵用蘆山機械密封由于密封面變形所引起的，而且蘆山機械密封面泄漏的概率是很高的。如果泵在啟動時就發生蘆山泵用蘆山機械密封泄漏，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蘆山機械密封的變形情況(kuang)(kuang)。如(ru)果發(fa)生變形，用平晶檢查密封面的干涉帶的變化情況(kuang)(kuang)，密封面變形存在于動環和靜(jing)環之間。

　　壓(ya)缸(gang)(gang)體(ti)動(dong)(dong)(dong)(dong)(dong)(dong)態(tai)密(mi)(mi)封(feng)(feng)(feng)(feng)系統采用(yong)(yong)的(de)(de)是主(zhu)密(mi)(mi)封(feng)(feng)(feng)(feng)設(she)計，一般都用(yong)(yong)U型密(mi)(mi)封(feng)(feng)(feng)(feng)圈。液壓(ya)缸(gang)(gang)體(ti)的(de)(de)往復(fu)(fu)式(shi)動(dong)(dong)(dong)(dong)(dong)(dong)態(tai)密(mi)(mi)封(feng)(feng)(feng)(feng)系統的(de)(de)設(she)計，開(kai)始使用(yong)(yong)了更(geng)加復(fu)(fu)雜的(de)(de)U型圈和(he)同軸(zhou)(zhou)(zhou)密(mi)(mi)封(feng)(feng)(feng)(feng)組(zu)件(jian)的(de)(de)復(fu)(fu)合式(shi)設(she)計。密(mi)(mi)封(feng)(feng)(feng)(feng)的(de)(de)靜(jing)(jing)環(huan)(huan)通(tong)常固定在殼(ke)體(ti)上(shang)，動(dong)(dong)(dong)(dong)(dong)(dong)環(huan)(huan)通(tong)過彈簧、彈簧座與軸(zhou)(zhou)(zhou)一同旋轉。靜(jing)(jing)環(huan)(huan)與殼(ke)體(ti)、動(dong)(dong)(dong)(dong)(dong)(dong)環(huan)(huan)與軸(zhou)(zhou)(zhou)形成(cheng)的(de)(de)間隙用(yong)(yong)成(cheng)型填(tian)料密(mi)(mi)封(feng)(feng)(feng)(feng)。在動(dong)(dong)(dong)(dong)(dong)(dong)環(huan)(huan)和(he)靜(jing)(jing)環(huan)(huan)接觸的(de)(de)端面(mian)(mian)形成(cheng)相對滑(hua)(hua)動(dong)(dong)(dong)(dong)(dong)(dong)面(mian)(mian)，即動(dong)(dong)(dong)(dong)(dong)(dong)密(mi)(mi)封(feng)(feng)(feng)(feng)面(mian)(mian)。為保證密(mi)(mi)封(feng)(feng)(feng)(feng)良好(hao)，動(dong)(dong)(dong)(dong)(dong)(dong)密(mi)(mi)封(feng)(feng)(feng)(feng)面(mian)(mian)應十分平(ping)直(zhi)和(he)光潔(jie)。彈簧力(li)和(he)被密(mi)(mi)封(feng)(feng)(feng)(feng)的(de)(de)流體(ti)壓(ya)力(li)使動(dong)(dong)(dong)(dong)(dong)(dong)環(huan)(huan)貼緊(jin)靜(jing)(jing)環(huan)(huan)。因動(dong)(dong)(dong)(dong)(dong)(dong)環(huan)(huan)與軸(zhou)(zhou)(zhou)通(tong)過彈簧連接，動(dong)(dong)(dong)(dong)(dong)(dong)環(huan)(huan)和(he)靜(jing)(jing)環(huan)(huan)間貼合性受(shou)軸(zhou)(zhou)(zhou)的(de)(de)振動(dong)(dong)(dong)(dong)(dong)(dong)和(he)擺動(dong)(dong)(dong)(dong)(dong)(dong)影響較(jiao)小。靜(jing)(jing)環(huan)(huan)一般常用(yong)(yong)潤滑(hua)(hua)性好(hao)的(de)(de)軟質(zhi)材料如石(shi)墨、填(tian)充聚四氟乙烯等，動(dong)(dong)(dong)(dong)(dong)(dong)環(huan)(huan)多用(yong)(yong)硬質(zhi)合金、陶瓷等材料制造。