裝式球閥是現代科技領域的新型産物-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

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2014/12/16-裝式球閥是現代科技領域的新型産物

裝式球閥是現代科技領域的新型産物
  
  上裝式球閥整體式閥體設計,上裝式耳軸固定支持,法蘭或對接焊結構,适合用于天然氣管道,閥體是一體化,減少洩露點,維修方便,工藝先進,接受壓力高,使用範圍廣。
  
  上裝式球閥廣泛應用在石油和天然氣管線上,及采油、煉油、石化、化工、化纖、冶金、電力、核電、食品和造紙等裝置中。上裝式球閥在管線上拆卸簡單迅速,維修方便快捷。當閥門在管線上出現故障需要修理時,不必從管線上拆卸閥門,隻須拆掉中法蘭螺栓和螺母,将閥蓋和閥杆組合件一起從閥體中取下來,然後取出球體和閥座組合件。即可在線修理球體和閥座。這種維修節省了時間,将生産中的損失降到最低點。
  
  上裝式球閥分為浮動球球閥和固定球球閥
  
  上裝式球閥公稱尺寸≤DN200。其球體上施加一壓縮彈簧,壓縮彈簧的作用是在球體上施加預緊力,使閥座密封面在任何情況下都緊密接觸,密封性能好。閥座與閥體接觸面的楔角為10°,閥座能夠自鎖,在管路方向上,當閥座受到較大的壓力時,閥座不會産生任何位移。故這種結構的閥門既有閘閥的特點又有球閥的優點。在維修檢查中發現,閥體與閥座易出現洩漏,如果增加彈簧的預緊力,勢必增加球閥的關閉力矩。為了不增加球閥的關閉力矩,在閥座密封面背面加一橡膠O形圈,解決了閥座密封面背面洩漏問題。
  
  上裝式球閥的缺點是彈簧預緊力不能調整和控制,而且裝配時彈簧壓縮量大,裝配困難。為了解決這個問題,彈簧材料選用ANSI302代替304。ANSI302彈簧剛度好,其耐蝕性與304相近。另外,增加了彈簧座和調整螺母,在閥座外圓和彈簧座上分别車削螺紋,用調整螺母将彈簧壓緊到彈簧座内,将閥座組合件裝入閥體。由于安裝球體之前彈簧已被壓縮,所以安裝球體很方便。當球體裝配後,将調整螺母退出彈簧座,此時彈簧對球體預緊力較小。如果要增加預緊力,可用調整螺母進行調整。
  
  上裝式球閥結構特點及用途
  
  上裝式球閥密封性能好:金屬閥座尾端設置彈簧保證密封面有足夠的預頂力,閥門在使用過程中密封面磨損時,在彈簧作用下閥門保證良好的密封性能;而當介質壓力較高時,介質在球體産生的不平衡力保證密封。
  
  上裝式球閥采用下裝式閥杆,設置倒密封結構,能确保填料處可靠密封。
  
  上裝式球閥頂裝設計:隻要卸下閥蓋即可進行維修或更換零件。
  
  上裝式球閥廣泛适用于粉塵、顆粒、高粘度等介質。

 


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