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。渣漿泵用射洪機械密封的工作原理要求射洪機械密封內部無任何雜質，在組裝射洪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射洪機械密封嚴重(zhong)漏泄。必要時可以(yi)制作工裝在(zai)組裝前(qian)水壓試驗(yan)，檢(jian)查動靜(jing)環(huan)座是否存在(zai)影(ying)響密(mi)封的(de)缺陷。

　　渣漿射洪泵用射洪機械密封由于密封面變形所引起的，而且射洪機械密封面泄漏的概率是很高的。如果泵在啟動時就發生射洪泵用射洪機械密封泄漏，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射洪機械密封的(de)(de)變(bian)(bian)形情(qing)況。如果發生變(bian)(bian)形，用(yong)平(ping)晶(jing)檢(jian)查密封面的(de)(de)干(gan)涉帶的(de)(de)變(bian)(bian)化情(qing)況，密封面變(bian)(bian)形存在(zai)于(yu)動環(huan)和靜環(huan)之間。

　　壓(ya)缸體(ti)(ti)動(dong)(dong)態(tai)密(mi)(mi)(mi)封(feng)系統采用(yong)(yong)(yong)的(de)是主密(mi)(mi)(mi)封(feng)設計，一般都用(yong)(yong)(yong)U型密(mi)(mi)(mi)封(feng)圈。液壓(ya)缸體(ti)(ti)的(de)往復式動(dong)(dong)態(tai)密(mi)(mi)(mi)封(feng)系統的(de)設計，開始使用(yong)(yong)(yong)了更加復雜(za)的(de)U型圈和同軸(zhou)密(mi)(mi)(mi)封(feng)組件的(de)復合式設計。密(mi)(mi)(mi)封(feng)的(de)靜環(huan)(huan)(huan)(huan)(huan)通(tong)常固定在殼體(ti)(ti)上，動(dong)(dong)環(huan)(huan)(huan)(huan)(huan)通(tong)過(guo)彈(dan)簧(huang)、彈(dan)簧(huang)座與(yu)軸(zhou)一同旋轉。靜環(huan)(huan)(huan)(huan)(huan)與(yu)殼體(ti)(ti)、動(dong)(dong)環(huan)(huan)(huan)(huan)(huan)與(yu)軸(zhou)形成(cheng)的(de)間隙用(yong)(yong)(yong)成(cheng)型填(tian)料(liao)(liao)密(mi)(mi)(mi)封(feng)。在動(dong)(dong)環(huan)(huan)(huan)(huan)(huan)和靜環(huan)(huan)(huan)(huan)(huan)接觸的(de)端(duan)面(mian)形成(cheng)相對(dui)滑動(dong)(dong)面(mian)，即動(dong)(dong)密(mi)(mi)(mi)封(feng)面(mian)。為保證密(mi)(mi)(mi)封(feng)良好，動(dong)(dong)密(mi)(mi)(mi)封(feng)面(mian)應十分平直和光潔。彈(dan)簧(huang)力(li)和被密(mi)(mi)(mi)封(feng)的(de)流體(ti)(ti)壓(ya)力(li)使動(dong)(dong)環(huan)(huan)(huan)(huan)(huan)貼(tie)緊(jin)靜環(huan)(huan)(huan)(huan)(huan)。因動(dong)(dong)環(huan)(huan)(huan)(huan)(huan)與(yu)軸(zhou)通(tong)過(guo)彈(dan)簧(huang)連接，動(dong)(dong)環(huan)(huan)(huan)(huan)(huan)和靜環(huan)(huan)(huan)(huan)(huan)間貼(tie)合性(xing)受軸(zhou)的(de)振動(dong)(dong)和擺動(dong)(dong)影響較小。靜環(huan)(huan)(huan)(huan)(huan)一般常用(yong)(yong)(yong)潤滑性(xing)好的(de)軟(ruan)質(zhi)材(cai)(cai)料(liao)(liao)如石墨(mo)、填(tian)充(chong)聚四氟乙烯等(deng)，動(dong)(dong)環(huan)(huan)(huan)(huan)(huan)多(duo)用(yong)(yong)(yong)硬質(zhi)合金、陶瓷(ci)等(deng)材(cai)(cai)料(liao)(liao)制造。