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。渣漿泵用劍閣機械密封的工作原理要求劍閣機械密封內部無任何雜質，在組裝劍閣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劍閣機械密封嚴重(zhong)漏泄。必要(yao)時(shi)可以制作工裝在組裝前水壓試(shi)驗，檢查(cha)動靜環座是否存在影響密封的缺陷。

　　渣漿劍閣泵用劍閣機械密封由于密封面變形所引起的，而且劍閣機械密封面泄漏的概率是很高的。如果泵在啟動時就發生劍閣泵用劍閣機械密封泄漏，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劍閣機械密封的變(bian)形情況。如果發生變(bian)形，用平晶檢查(cha)密(mi)封(feng)面的干涉帶的變(bian)化情況，密(mi)封(feng)面變(bian)形存(cun)在于動環和靜環之間。

　　壓(ya)缸體動(dong)(dong)(dong)(dong)態(tai)密封(feng)(feng)(feng)(feng)系統采用(yong)的(de)(de)(de)是主密封(feng)(feng)(feng)(feng)設計(ji)，一(yi)般(ban)都用(yong)U型(xing)(xing)密封(feng)(feng)(feng)(feng)圈。液壓(ya)缸體的(de)(de)(de)往(wang)復(fu)式(shi)動(dong)(dong)(dong)(dong)態(tai)密封(feng)(feng)(feng)(feng)系統的(de)(de)(de)設計(ji)，開始使用(yong)了更加(jia)復(fu)雜的(de)(de)(de)U型(xing)(xing)圈和(he)(he)(he)同(tong)軸(zhou)(zhou)密封(feng)(feng)(feng)(feng)組(zu)件(jian)的(de)(de)(de)復(fu)合(he)式(shi)設計(ji)。密封(feng)(feng)(feng)(feng)的(de)(de)(de)靜(jing)(jing)(jing)環(huan)(huan)(huan)(huan)通(tong)常(chang)固定在殼體上(shang)，動(dong)(dong)(dong)(dong)環(huan)(huan)(huan)(huan)通(tong)過彈簧(huang)、彈簧(huang)座與(yu)(yu)軸(zhou)(zhou)一(yi)同(tong)旋(xuan)轉(zhuan)。靜(jing)(jing)(jing)環(huan)(huan)(huan)(huan)與(yu)(yu)殼體、動(dong)(dong)(dong)(dong)環(huan)(huan)(huan)(huan)與(yu)(yu)軸(zhou)(zhou)形(xing)成的(de)(de)(de)間(jian)(jian)隙用(yong)成型(xing)(xing)填料(liao)密封(feng)(feng)(feng)(feng)。在動(dong)(dong)(dong)(dong)環(huan)(huan)(huan)(huan)和(he)(he)(he)靜(jing)(jing)(jing)環(huan)(huan)(huan)(huan)接觸的(de)(de)(de)端面(mian)形(xing)成相對滑(hua)動(dong)(dong)(dong)(dong)面(mian)，即(ji)動(dong)(dong)(dong)(dong)密封(feng)(feng)(feng)(feng)面(mian)。為保(bao)證(zheng)密封(feng)(feng)(feng)(feng)良好，動(dong)(dong)(dong)(dong)密封(feng)(feng)(feng)(feng)面(mian)應十分平直和(he)(he)(he)光潔。彈簧(huang)力和(he)(he)(he)被(bei)密封(feng)(feng)(feng)(feng)的(de)(de)(de)流(liu)體壓(ya)力使動(dong)(dong)(dong)(dong)環(huan)(huan)(huan)(huan)貼緊靜(jing)(jing)(jing)環(huan)(huan)(huan)(huan)。因動(dong)(dong)(dong)(dong)環(huan)(huan)(huan)(huan)與(yu)(yu)軸(zhou)(zhou)通(tong)過彈簧(huang)連接，動(dong)(dong)(dong)(dong)環(huan)(huan)(huan)(huan)和(he)(he)(he)靜(jing)(jing)(jing)環(huan)(huan)(huan)(huan)間(jian)(jian)貼合(he)性受軸(zhou)(zhou)的(de)(de)(de)振動(dong)(dong)(dong)(dong)和(he)(he)(he)擺動(dong)(dong)(dong)(dong)影響(xiang)較小。靜(jing)(jing)(jing)環(huan)(huan)(huan)(huan)一(yi)般(ban)常(chang)用(yong)潤滑(hua)性好的(de)(de)(de)軟質(zhi)材料(liao)如石墨、填充聚四氟(fu)乙烯等(deng)，動(dong)(dong)(dong)(dong)環(huan)(huan)(huan)(huan)多用(yong)硬質(zhi)合(he)金、陶(tao)瓷等(deng)材料(liao)制(zhi)造。