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。渣漿泵用濱海機械密封的工作原理要求濱海機械密封內部無任何雜質，在組裝濱海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濱海機械密封嚴(yan)重(zhong)漏泄。必要時(shi)可以制作工裝(zhuang)在組(zu)裝(zhuang)前水壓試驗，檢查動靜(jing)環座是否存在影響密封的缺陷。

　　渣漿濱海泵用濱海機械密封由于密封面變形所引起的，而且濱海機械密封面泄漏的概率是很高的。如果泵在啟動時就發生濱海泵用濱海機械密封泄漏，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濱海機械密封的(de)變(bian)形(xing)(xing)情況(kuang)。如(ru)果發(fa)生變(bian)形(xing)(xing)，用平晶檢查密(mi)封面(mian)的(de)干涉帶的(de)變(bian)化情況(kuang)，密(mi)封面(mian)變(bian)形(xing)(xing)存在于動環(huan)和靜環(huan)之間(jian)。

　　壓缸(gang)體(ti)動(dong)(dong)(dong)(dong)態密(mi)(mi)(mi)封(feng)(feng)系(xi)統采用的(de)(de)(de)是主密(mi)(mi)(mi)封(feng)(feng)設計(ji)，一(yi)(yi)般都(dou)用U型密(mi)(mi)(mi)封(feng)(feng)圈(quan)。液壓缸(gang)體(ti)的(de)(de)(de)往(wang)復(fu)式動(dong)(dong)(dong)(dong)態密(mi)(mi)(mi)封(feng)(feng)系(xi)統的(de)(de)(de)設計(ji)，開始使用了更加(jia)復(fu)雜的(de)(de)(de)U型圈(quan)和同軸密(mi)(mi)(mi)封(feng)(feng)組件的(de)(de)(de)復(fu)合(he)式設計(ji)。密(mi)(mi)(mi)封(feng)(feng)的(de)(de)(de)靜(jing)環(huan)(huan)(huan)(huan)通(tong)(tong)常(chang)固定在殼(ke)(ke)體(ti)上(shang)，動(dong)(dong)(dong)(dong)環(huan)(huan)(huan)(huan)通(tong)(tong)過彈簧(huang)、彈簧(huang)座與(yu)軸一(yi)(yi)同旋轉。靜(jing)環(huan)(huan)(huan)(huan)與(yu)殼(ke)(ke)體(ti)、動(dong)(dong)(dong)(dong)環(huan)(huan)(huan)(huan)與(yu)軸形(xing)(xing)成的(de)(de)(de)間(jian)隙(xi)用成型填料密(mi)(mi)(mi)封(feng)(feng)。在動(dong)(dong)(dong)(dong)環(huan)(huan)(huan)(huan)和靜(jing)環(huan)(huan)(huan)(huan)接觸的(de)(de)(de)端(duan)面(mian)(mian)形(xing)(xing)成相對滑(hua)動(dong)(dong)(dong)(dong)面(mian)(mian)，即動(dong)(dong)(dong)(dong)密(mi)(mi)(mi)封(feng)(feng)面(mian)(mian)。為保證密(mi)(mi)(mi)封(feng)(feng)良好(hao)，動(dong)(dong)(dong)(dong)密(mi)(mi)(mi)封(feng)(feng)面(mian)(mian)應十分平直和光潔。彈簧(huang)力(li)和被密(mi)(mi)(mi)封(feng)(feng)的(de)(de)(de)流體(ti)壓力(li)使動(dong)(dong)(dong)(dong)環(huan)(huan)(huan)(huan)貼(tie)緊靜(jing)環(huan)(huan)(huan)(huan)。因動(dong)(dong)(dong)(dong)環(huan)(huan)(huan)(huan)與(yu)軸通(tong)(tong)過彈簧(huang)連接，動(dong)(dong)(dong)(dong)環(huan)(huan)(huan)(huan)和靜(jing)環(huan)(huan)(huan)(huan)間(jian)貼(tie)合(he)性受軸的(de)(de)(de)振動(dong)(dong)(dong)(dong)和擺動(dong)(dong)(dong)(dong)影(ying)響(xiang)較小。靜(jing)環(huan)(huan)(huan)(huan)一(yi)(yi)般常(chang)用潤(run)滑(hua)性好(hao)的(de)(de)(de)軟(ruan)質材(cai)料如石(shi)墨(mo)、填充聚四氟(fu)乙烯等，動(dong)(dong)(dong)(dong)環(huan)(huan)(huan)(huan)多用硬質合(he)金、陶瓷等材(cai)料制造。