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球閥原理

球閥的結構及工作原理

球閥

 球閥是一種只需要旋轉 90 度的操作和很小的轉動力矩就能關閉嚴密,完全直通的閥體內腔為介質提供了阻力很小、直通的流道。通常認為球閥最適宜直接做開閉使用,但近來的發展已將球閥設計成使它具有節流和控制流量之用。球閥的主要特點是本身結構緊湊,易于操作和維修,適用于水、溶劑、酸和天然氣等一般工作介質,而且還適用于工作條件惡劣的介質,如氧氣、過氧化氫、甲烷和乙烯等。球閥閥體可以是整體的,也可以是組合式的。

發展演變與工作原理

QIUFASHIYOUXUANSAIFAYANBIANERLAI。TAJUYOUXIANGTONGDEXUANZHUAN 90 DUTIDONGZUO,BUTONGDESHIXUANSAITISHIQIUTI,YOUYUANXINGTONGKONGHUOTONGDAOTONGGUOQIZHOUXIAN。QIUMIANHETONGDAOKOUDEBILIYINGGAISHIZHEYANGDE,JIDANGQIUXUANZHUAN 90 DUSHI,ZAIJIN、CHUKOUCHUYINGQUANBUCHENGXIANQIUMIAN,CONGERJIEDUANLIUDONG。

優點

  • 流體阻力小,其阻力系數與同長度的管段相等;
  • 結構簡單、體積小、重量輕;
  • 緊密可靠,目前球閥的密封面材料廣泛使用塑料、密封性好,在真空系統中也已廣泛使用;
  • 操作方便,開閉迅速,從全開到全關只要旋轉 90°,便于遠距離的控制;
  • 維修方便,球閥結構簡單,密封圈一般都是活動的,拆卸更換都比較方便;
  • 在全開或全閉時,球體和閥座的密封面與介質隔離,介質通過時,不會引起閥門密封面的侵蝕;
  • 適用范圍廣,通徑從小到幾毫米,大到幾米,從高真空至高壓力都可應用。



  球閥是由旋塞閥演變而來的,它的啟閉件作為一個球體,利用球體繞閥桿的軸線 度實現開啟和關閉的目的,不同的是旋塞體是球體,有圓形或通道通過其軸線。球面和通道口的比例應該是這樣的,即當球旋轉 90 度時,在進、出口處應全部呈現球面,從而截斷流動。球閥的作用在管道上主要用于切斷、分配和改變介質流動方向,設計成 V 形開口的球閥還具有良好的流量調節功能。

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