水力控制閥的分類特點-上海冠高閥門制造有限公司_168体育网页版

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168体育网页版

網站地圖 | XML地圖 | 英文版冠高閥門.中國 | Shanghai GuanGao Valve Manufacturing Co., Ltd.
2013/8/3-水力控制閥的分類特點

水力控制閥按結構可分為隔膜型和活塞型兩類,工作原理相同,都是以上下遊壓力差△P為動力,由導閥控制,使隔膜(活塞)液壓式差動操作,完全由水力自動調節,從而使主閥閥盤完全開啟或完全關閉或處于調節狀态。當進入隔膜(活塞)上方控制室内的壓力水被排到大氣或下遊低壓區時,作用在閥盤底部和隔膜下方的壓力值就大于上方的壓力值,所以将主閥閥盤推到完全開啟的位置;當進入隔膜(活塞)上方控制室内的壓力水不能排到大氣或下遊低壓區時,作用在隔膜(活塞)上方的壓力值就大于下方的壓力值,所以就會把主閥閥盤壓到完全關閉的位置;當隔膜(活塞)上方控制室内的壓力值處于入口壓力與出口壓力中間時,主閥閥盤就處于調節狀态,其調節位置取決于導管系統中的針閥和可調導閥的聯合控制作用。可調導閥可以通過下遊的出口壓力并随它的變化而開大或關小其自身的小閥口,從而改變隔膜(活塞)上方控制室的壓力值,控制方閥閥盤的調節位置。使用,首先要注意選型。選型不當,會造成阻水和漏氣現象。選用水力控制閥時,必須按設備每小時的耗汽量乘以選用倍率2-3倍為最大凝結水量,來選擇水力控制閥的排水量。才能保證水力控制閥在開車時能盡快排出凝結水,迅速提高加熱設備的溫度。水力控制閥排放能量不夠,會造成凝結水不能及時排出,降低加熱設備的熱效率。
選用水力控制閥時,不能以公稱壓力選水力控制閥,因為公稱壓力隻能表示水力控制閥體殼承受壓力等級,水力控制閥公稱壓力與工作壓力的差别很大。所以要根據工作壓差來選擇水力控制閥的排水量。工作壓差是指水力控制閥前的工作壓力減去水力控制閥出口背壓的差值。 選擇水力控制閥要求準确無誤地阻汽排水,靈敏度高,能提高蒸汽利用率,不洩漏蒸汽,工作性能可靠,背壓率高、使用壽命長、維修方便是首選的條件。


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168体育

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