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                應用知識
                高溫高壓閘閥的試壓方法
                發布時間:2013-09-09 12:11:45
                  閥門的殼體試驗是為了檢驗整個殼體的耐壓能力。在殼體試驗之前,不允許對閥門涂漆或使用其他防止滲漏的涂層。但允許進行無密封作用的化學防銹處理。在試驗過程中,不得對閥門施加影響試驗結果的外力。試驗在保壓和檢測期間應維持不變。用液體試驗時,應盡量排除閥門體腔內的氣體。在達到保壓時間后,殼體不得發生滲漏或引起結構損傷。
                  強度試驗的方法和步驟:用液體試驗時,閥門試壓充水時,要將閥內空氣排凈。試驗臺上部壓盤,有排氣孔,用小閥門開閉??諝馀艃舻臉酥臼?,排氣孔中出來的全部都是水。關閉排氣孔后,開始升壓。升壓過程要緩慢,不要急劇。達到規定壓力后,檢查殼體(包括填料函及閥體與閥蓋的聯接處)、是否滲漏,閥體外表面、閥蓋、填料、絲堵孔等各處有無泄漏及滲汗現象,承壓部位有無變形。無可見泄漏、變形;保壓,壓力不變為合格。隨后打開排放閥,使體腔內壓力緩慢降至零。
                  密封試驗是檢驗啟閉件和閥體密封副密封性能的試驗。將閥壓緊后,試壓泵工作,從試壓泵的壓力表上,可以讀出閥門承受壓力的數字。密封試驗之前,應除去密封面上的油漬。密封試驗應在殼體試驗后進行,閥門體腔內完全充滿試驗介質,然后關閉閥門,向閥門一端施加試驗壓力,達到規定試驗壓力和規定保壓時間后,然后應關閉上密封并向閥體內腔打壓,使壓力逐漸升高至產品圖規定壓力(不允許使壓力急劇地增加),試驗持續一定時間,在閥門加壓試驗介質的下游端(在該密封副的另一側)檢測閥門的泄漏無可見泄漏為合格。隨后打開排放閥,使體腔內壓力緩慢降至零。將閥門顛倒過來,試驗相反一側,閥門體腔內完全充滿試驗介質,然后關閉閥門,向閥門一端施加試驗壓力,達到規定壓力后,在閥門加壓試驗介質的下游端檢測閥門的泄漏。
                  上密封的試驗方法和步驟
                  封閉閥門進口和出口,放松填料壓蓋,閥門處于全開狀態,使上密封關閉,給體腔充滿試驗介質,并逐漸加壓到規定的試驗壓力,使壓力逐漸升高至產品圖規定壓力(不允許使壓力急劇地增加),試驗持續一定時間,檢查填料處有無泄漏。無可見泄漏為合格。隨后打開排放閥,使體腔內壓力緩慢降至零。
                  觀察上密封處是否有泄漏。
                  試驗合格后,應及時排凈內部積水,并吹干,關閉閥門,封閉出入口,并作出明顯標記(已試過壓的標記)。
                 
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