Telescopic butterfly valve for the flange butterfly valve and pipe expansion of the two functions as a whole, that can play a throttling effect, but also solve the temperature difference caused by the elimination of internal forces, which play a telescopic effect. The valve can be used in power, metallurgy, petroleum, chemical, gas, urban heating, water and paper making, textile, medicine, food, water supply and drainage, energy, all non-corrosive gases, liquids, semi-fluids and solid powder pipelines and containers Use as regulation and closure. Can be installed at any position, from the media, the impact of flow, and the other for the installation of two flange valve spacing adjustment. 1, novel design, unique structure. 2, small size, light weight. 3, light and labor-saving operation, opening and closing quickly. 4, sealing parts can be adjusted and replaced, reliable sealing performance, small flow resistance, energy saving.
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