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。渣漿泵用中陽機械密封的工作原理要求中陽機械密封內部無任何雜質，在組裝中陽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中陽機械密封嚴重漏泄(xie)。必要時可以制作(zuo)工裝在組裝前水壓試驗，檢查動靜(jing)環座是否存在影響密封的缺陷(xian)。

　　渣漿中陽泵用中陽機械密封由于密封面變形所引起的，而且中陽機械密封面泄漏的概率是很高的。如果泵在啟動時就發生中陽泵用中陽機械密封泄漏，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中陽機械密封的(de)變(bian)(bian)(bian)形情(qing)況。如果發生變(bian)(bian)(bian)形，用平晶檢查密(mi)封(feng)面(mian)的(de)干涉帶的(de)變(bian)(bian)(bian)化情(qing)況，密(mi)封(feng)面(mian)變(bian)(bian)(bian)形存在于動環和(he)靜環之間。

　　壓缸體動(dong)(dong)(dong)(dong)態(tai)密(mi)(mi)(mi)(mi)封(feng)系統采(cai)用的(de)是主密(mi)(mi)(mi)(mi)封(feng)設計(ji)，一般都用U型密(mi)(mi)(mi)(mi)封(feng)圈。液壓缸體的(de)往(wang)復式動(dong)(dong)(dong)(dong)態(tai)密(mi)(mi)(mi)(mi)封(feng)系統的(de)設計(ji)，開始使用了(le)更加復雜(za)的(de)U型圈和(he)同軸(zhou)密(mi)(mi)(mi)(mi)封(feng)組件(jian)的(de)復合式設計(ji)。密(mi)(mi)(mi)(mi)封(feng)的(de)靜環(huan)(huan)(huan)(huan)通(tong)常固定在殼體上，動(dong)(dong)(dong)(dong)環(huan)(huan)(huan)(huan)通(tong)過彈簧、彈簧座與軸(zhou)一同旋轉。靜環(huan)(huan)(huan)(huan)與殼體、動(dong)(dong)(dong)(dong)環(huan)(huan)(huan)(huan)與軸(zhou)形成(cheng)(cheng)的(de)間(jian)隙用成(cheng)(cheng)型填(tian)料(liao)密(mi)(mi)(mi)(mi)封(feng)。在動(dong)(dong)(dong)(dong)環(huan)(huan)(huan)(huan)和(he)靜環(huan)(huan)(huan)(huan)接觸的(de)端面(mian)形成(cheng)(cheng)相(xiang)對(dui)滑動(dong)(dong)(dong)(dong)面(mian)，即(ji)動(dong)(dong)(dong)(dong)密(mi)(mi)(mi)(mi)封(feng)面(mian)。為保(bao)證密(mi)(mi)(mi)(mi)封(feng)良(liang)好，動(dong)(dong)(dong)(dong)密(mi)(mi)(mi)(mi)封(feng)面(mian)應十(shi)分平直和(he)光潔。彈簧力(li)和(he)被密(mi)(mi)(mi)(mi)封(feng)的(de)流體壓力(li)使動(dong)(dong)(dong)(dong)環(huan)(huan)(huan)(huan)貼(tie)緊(jin)靜環(huan)(huan)(huan)(huan)。因動(dong)(dong)(dong)(dong)環(huan)(huan)(huan)(huan)與軸(zhou)通(tong)過彈簧連接，動(dong)(dong)(dong)(dong)環(huan)(huan)(huan)(huan)和(he)靜環(huan)(huan)(huan)(huan)間(jian)貼(tie)合性(xing)受軸(zhou)的(de)振(zhen)動(dong)(dong)(dong)(dong)和(he)擺動(dong)(dong)(dong)(dong)影響較小(xiao)。靜環(huan)(huan)(huan)(huan)一般常用潤滑性(xing)好的(de)軟(ruan)質(zhi)材料(liao)如(ru)石墨、填(tian)充(chong)聚四氟乙烯等(deng)(deng)，動(dong)(dong)(dong)(dong)環(huan)(huan)(huan)(huan)多用硬質(zhi)合金、陶瓷等(deng)(deng)材料(liao)制造。