评论3

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  whs1

  楼主 2008/11/30 8:20:29

• 

  Doncloud

  楼主 2009/2/15 0:24:43

  光电编码器

  
  

  A Butterfly Valve （蝶阀）is from a family of valves called quarter turn valves. The "butterfly" is a metal disc mounted on a rod. When the valve is closed, the disc is turned so that it completely blocks off the passageway. When the valve is open, the disc is rotated a quarter turn so that it allows unrestricted passage. The position of the disc is effected from outside the valve.

  
  

  Globe Valve, Solenoid Valve, Ball Valve, Check Valve, Plug Valve
  Tantex Corporation, 欢迎选购。

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  comorg

  楼主 2009/2/15 14:51:21