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                應用知識
                截止閥的基本結構及使用注意事項
                發布時間:2013-09-09 12:13:24
                  截止閥是利用閥桿升降帶動閥頭,從而改變閥盤與閥座之間的距離達到啟閉控制的閥門,截止閥是在化工生產中使用范圍最廣的截斷類閥門。截止閥在實際生產中主要用于水、蒸汽、壓縮空氣等管路的控制,但不宜應用于粘度大易結晶的材料。
                  截止閥的結構較為復雜,但實際操作簡便省力,在調節流量和截斷通道方面有較好表現,啟閉速度慢極少出現水錘現象。截止閥的結構緊湊,外形有較明顯特點,閥門頂部設有手輪和閥桿,中間設有螺紋和填料函密封段。
                  截止閥在使用時判斷閥門啟閉狀態的主要方式,是觀察閥桿露出閥蓋的高度,以此來控制閥門的操作。閥桿與閥蓋連接的部分可能存在空隙,容易出現介質泄漏,這一點可以通過填料密封來解決。小型截止閥的閥桿螺紋設在閥體內,因此在使用中較多與介質接觸時間較長,容易被介質腐蝕。
                  截止閥的安裝要參考流體的方向,注意保持管路流體的低進高出,也就是從下向上流過閥座口。這樣安裝的目的是減少閥體內流體阻力從而降低閥門啟閉力,同時還能保持在閥門關閉時閥桿、填料函不與介質接觸,減少損壞和泄漏的發生。
                  截止閥在使用時,應注意以下三點:
                  1、截止閥在開啟前應進行泄漏檢查,確定閥門是否無泄漏缺陷、填料函是否無泄漏缺陷。
                  2、截止閥的閥桿操作如無法用人手完成,可使用專用的F扳手代替,但在F扳手仍無法開啟的情況下,切勿使用加長扳手強行開閉,以避免閥門的損壞甚至是安全事故的發生。
                  3、截止閥在應用于中壓汽管路時,在開啟前需進行冷凝水排除,之后對管道進行蒸汽預熱,預熱壓力保持在0.2至0.3MPA之間,這樣做的目的是避免溫度、壓力突然變化引起的密封件損壞,在確定狀態穩定后可將壓力調至所需水平。
                 
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