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。渣漿永嘉泵用永嘉機械密封的工作原理要求永嘉機械密封內部無任何雜質，在組裝永嘉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永嘉機械密封嚴重漏泄。必(bi)要時可以制作工裝在組裝前水壓(ya)試(shi)驗(yan)，檢查動靜環座是否(fou)存在影響密封的(de)缺陷(xian)。

　　渣漿永嘉泵用永嘉機械密封由于密封面變形所引起的，而且永嘉機械密封面泄漏的概率是很高的。如果泵在啟動時就發生永嘉泵用永嘉機械密封泄漏，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永嘉機械密封的(de)變形(xing)情況。如果(guo)發生變形(xing)，用平晶(jing)檢查(cha)密(mi)封面(mian)的(de)干涉帶(dai)的(de)變化情況，密(mi)封面(mian)變形(xing)存在于動環(huan)和靜環(huan)之間(jian)。

　　壓缸(gang)體動(dong)(dong)(dong)(dong)態密(mi)封(feng)系(xi)統采用(yong)(yong)的(de)是(shi)主密(mi)封(feng)設計(ji)，一般都用(yong)(yong)U型密(mi)封(feng)圈。液壓缸(gang)體的(de)往(wang)復式動(dong)(dong)(dong)(dong)態密(mi)封(feng)系(xi)統的(de)設計(ji)，開始使用(yong)(yong)了更(geng)加復雜(za)的(de)U型圈和(he)同軸(zhou)密(mi)封(feng)組件的(de)復合式設計(ji)。密(mi)封(feng)的(de)靜環(huan)(huan)(huan)(huan)通(tong)常(chang)固定在(zai)殼體上(shang)，動(dong)(dong)(dong)(dong)環(huan)(huan)(huan)(huan)通(tong)過彈簧(huang)、彈簧(huang)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(yong)(yong)成(cheng)(cheng)型填料密(mi)封(feng)。在(zai)動(dong)(dong)(dong)(dong)環(huan)(huan)(huan)(huan)和(he)靜環(huan)(huan)(huan)(huan)接觸的(de)端面形成(cheng)(cheng)相(xiang)對滑(hua)動(dong)(dong)(dong)(dong)面，即動(dong)(dong)(dong)(dong)密(mi)封(feng)面。為保證密(mi)封(feng)良(liang)好(hao)(hao)，動(dong)(dong)(dong)(dong)密(mi)封(feng)面應十分平直和(he)光潔。彈簧(huang)力和(he)被密(mi)封(feng)的(de)流體壓力使動(dong)(dong)(dong)(dong)環(huan)(huan)(huan)(huan)貼緊靜環(huan)(huan)(huan)(huan)。因動(dong)(dong)(dong)(dong)環(huan)(huan)(huan)(huan)與軸(zhou)通(tong)過彈簧(huang)連接，動(dong)(dong)(dong)(dong)環(huan)(huan)(huan)(huan)和(he)靜環(huan)(huan)(huan)(huan)間(jian)貼合性(xing)受軸(zhou)的(de)振動(dong)(dong)(dong)(dong)和(he)擺動(dong)(dong)(dong)(dong)影響較小。靜環(huan)(huan)(huan)(huan)一般常(chang)用(yong)(yong)潤(run)滑(hua)性(xing)好(hao)(hao)的(de)軟質材(cai)料如石墨(mo)、填充聚四(si)氟乙烯等，動(dong)(dong)(dong)(dong)環(huan)(huan)(huan)(huan)多用(yong)(yong)硬質合金(jin)、陶瓷等材(cai)料制(zhi)造。