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                應用知識
                楔式閘閥的密封原理
                發布時間:2013-09-09 12:05:12
                楔式閘閥的密封原理是靠楔形閘板上的兩密封面和閥體上的兩密封面楔入時的緊密結合來達密封的。使用楔形閘板的目的是為了提高輔助的密封載荷,以使金屬硬密封楔式閘閥既能對高介質壓力,也能對低介質壓力進行密封。關閉時順時針旋轉閥桿,使閘閥密封面和閥體密封面密合而達到密封。但是,金屬密封的楔式閘閥由楔入作用所產生的進口端密封比壓受到介質的作用力往往不足以達到進口端密封.所以說金屬密封楔式閘閥屬單面強制密封。
                  楔式閘閥應用范圍:楔式閘閥廣泛適用于石油化工,火力發電廠等油品、水蒸氣管路上作接通或截斷管路中介質的啟閉裝置。
                  在各種類型的閥門中,閘閥是應用最廣泛的一種。它一般只適用于全開或全閉,不能作調節和節流使用。
                 
                  楔式閘閥一般用在對閥門的外形尺寸沒有嚴格要求,而且使用條件又比較苛刻的場合。如高溫高壓的工作介質,要求關閉件要保證長期密封的情況下等。
                 
                  通常,使用條件或要求密封性能可靠,高壓,高壓截止(壓差大)、低壓截止(壓差小),低噪聲、有氣穴和汽化現象、高溫介質、低溫(深冷)時,推薦使用楔式閘閥。如電力工業、石油煉制、石油化工、海洋石油、城市建設中的自來水工程和污水處理工程,化工等領域中應用較多。
                 
                  楔式閘閥結構特點:
                    1、結構緊湊、設計合理、閥門剛性好、通道流暢,流量系數小 
                    2、密封面采用不銹鋼和硬質合金,使用壽命長 
                    3、采用柔性石墨填料、密封可靠,操作輕便靈活 
                    4、驅動方式為手動、氣動、電動、齒輪傳動 
                    5、結構形式為彈性楔式單閘板、剛性楔式單閘板雙閘板型式
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