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。渣漿城固泵用城固機械密封的工作原理要求城固機械密封內部無任何雜質，在組裝城固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城固機械密封嚴(yan)重漏泄。必要(yao)時可(ke)以(yi)制作(zuo)工(gong)裝(zhuang)在(zai)(zai)組裝(zhuang)前(qian)水壓試驗，檢(jian)查動(dong)靜(jing)環座是否存在(zai)(zai)影響(xiang)密封的缺陷。

　　渣漿城固泵用城固機械密封由于密封面變形所引起的，而且城固機械密封面泄漏的概率是很高的。如果泵在啟動時就發生城固泵用城固機械密封泄漏，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城固機械密封的變(bian)形(xing)情況。如果發生(sheng)變(bian)形(xing)，用平(ping)晶檢查(cha)密(mi)(mi)封面(mian)的干涉帶(dai)的變(bian)化(hua)情況，密(mi)(mi)封面(mian)變(bian)形(xing)存在于動環和(he)靜環之間。

　　壓缸(gang)體動(dong)(dong)(dong)(dong)態(tai)密(mi)(mi)封(feng)(feng)系統采用的(de)是主密(mi)(mi)封(feng)(feng)設計，一(yi)般都(dou)用U型(xing)密(mi)(mi)封(feng)(feng)圈。液壓缸(gang)體的(de)往復(fu)(fu)式動(dong)(dong)(dong)(dong)態(tai)密(mi)(mi)封(feng)(feng)系統的(de)設計，開始使用了(le)更加復(fu)(fu)雜(za)的(de)U型(xing)圈和(he)(he)同軸(zhou)(zhou)密(mi)(mi)封(feng)(feng)組件的(de)復(fu)(fu)合(he)式設計。密(mi)(mi)封(feng)(feng)的(de)靜環(huan)(huan)(huan)(huan)(huan)通常固定在殼體上(shang)，動(dong)(dong)(dong)(dong)環(huan)(huan)(huan)(huan)(huan)通過(guo)彈簧、彈簧座與軸(zhou)(zhou)一(yi)同旋轉(zhuan)。靜環(huan)(huan)(huan)(huan)(huan)與殼體、動(dong)(dong)(dong)(dong)環(huan)(huan)(huan)(huan)(huan)與軸(zhou)(zhou)形成(cheng)的(de)間隙用成(cheng)型(xing)填料(liao)密(mi)(mi)封(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(chu)的(de)端面形成(cheng)相對(dui)滑動(dong)(dong)(dong)(dong)面，即動(dong)(dong)(dong)(dong)密(mi)(mi)封(feng)(feng)面。為保證密(mi)(mi)封(feng)(feng)良好，動(dong)(dong)(dong)(dong)密(mi)(mi)封(feng)(feng)面應十分平直和(he)(he)光潔。彈簧力和(he)(he)被密(mi)(mi)封(feng)(feng)的(de)流體壓力使動(dong)(dong)(dong)(dong)環(huan)(huan)(huan)(huan)(huan)貼緊靜環(huan)(huan)(huan)(huan)(huan)。因動(dong)(dong)(dong)(dong)環(huan)(huan)(huan)(huan)(huan)與軸(zhou)(zhou)通過(guo)彈簧連接，動(dong)(dong)(dong)(dong)環(huan)(huan)(huan)(huan)(huan)和(he)(he)靜環(huan)(huan)(huan)(huan)(huan)間貼合(he)性(xing)受軸(zhou)(zhou)的(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(yi)般常用潤滑性(xing)好的(de)軟(ruan)質(zhi)材(cai)料(liao)如石墨、填充聚四(si)氟乙烯等(deng)，動(dong)(dong)(dong)(dong)環(huan)(huan)(huan)(huan)(huan)多用硬(ying)質(zhi)合(he)金、陶(tao)瓷等(deng)材(cai)料(liao)制造(zao)。