電動調節閥外洩解決方法-資訊--格業閥門有限公司_鸭脖电竞

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電動調節閥外洩解決方法

發布時間:2017-11-07 03:40:12   訪問:623

 在現代化工廠的自動控制中,調節閥起着十分重要的作用,這些工廠的生産取決于流動着的介質正确分配和控制。這些控制無論是能量的交換、壓力的降低或者是簡單的容器加料,都需要某些最終控制元件去完成。
調節閥屬于控制閥系列,主要作用是調節介質的壓力、流量、溫度等參數,是工藝環路中最終的控制元件。如何解決電動調節閥外洩的問題
  1)增加密封油脂法
  對未使用密封油脂的電動調節閥,可考慮增加密封油脂來提高閥杆密封性能。
  2)增加填料法
  為提高填料對閥杆的密封性能,可采用增加填料的方法。通常是采用雙層、多層混合填料形式,單純增加數量,如将3片增到5片,效果并不明顯。
  3)更換石墨填料法
  大量使用的四氟填料,因其工作溫度在-20~200℃範圍内,當溫度在上、下限,變化較大時,其密封性便明顯下降,老化快,壽命短。柔性石墨填料可克服這些缺點且使用壽命長。因而有的工廠全部将四氟填料改為石墨填料,甚至新購回的調節閥也将其中的四氟填料換成石墨填料後使用。但使用石墨填料的回差大,初時有的還産生爬行現象,對此必須有所考慮。
  4)改變流向,置P2在閥杆端法
  當△P較大,P1又較大時,密封P1顯然比密封P2困難.因此,可采取改變流向的方法,将P1在閥杆端改為P2在閥杆端,這對壓力高、壓差大的閥是較有效的.如波紋管閥就通常應考慮密封P2。
  5)采用透鏡墊密封法
  對于上、下蓋的密封,閥座與上、下閥體的密封.若為平面密封,在高溫高壓下,密封性差,引起外洩,可以改用透鏡墊密封,能得到滿意的效果。
  6)更換密封墊片
  至今,大部分密封墊片仍采用石棉闆,在高溫下,密封性能較差,壽命也短,引起外洩。遇到這種情況,可改用纏繞墊片,“O”形環等,現在許多廠已采用。

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