手動對夾式通風蝶閥，普遍適用于建材、玻璃、礦山、電力、輕工、造紙等行業的通風、環保工程等管道系統中。對管道中氣體介質按不同控制信號調節流量大小和切斷。

  This valve is widely used in the pipe system such as venting and environment protection in building material, glass, mining, power, light industry and papermaking departments. It can change the flow and cut off gas medium in the pipe by the different control signal.

結構特點：

Structure characteristic:

  手動對夾式通風蝶閥，采用優質碳素鋼焊接。具有重量輕、結構緊湊、流阻損失小、操作靈活、指示方位明確、維護方便、使用壽命長等優點,可任意安裝，特別適合架空管道。配用蝸輪傳動裝置切換，開關輕松自如,任意調節閥門開度,是調節流量的理想設備。

  The valve is welded in fine carbon steel, having the features of light weight, compact structure, endurance, little in the lost of flow resistance, definite direction, easy to maintenance and long life. It can be installed at any angle, especially suitable for aerial piping. The valve is used with worm gearing device to form a complete set to realize switching freely and adjusting open angle of valve arbitrarily. It is the ideal equipment of adjusting flow.

性能參數：

Performance parameter:

l  S表示蝸輪傳動

l  S denotes worm wheel transmission

GDTD---S外形連接尺寸：

Appearance joint dimensions: