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SD341X telescopic type method blue butterfly valve is set telescopic device and flange type butterfly valve function Yu one of multifunctional hard sealed butterfly valve, country machine valve in flange butterfly valve based Shang additional telescopic section, can elimination pipeline hot stress, special applies Yu replaced old pipeline Shang of valve, now has widely for oil, and chemical, and medicine, and power, and to drainage, and gas tube road, can automatically compensation pipeline thermal expansion and contraction, is regulation flow and closure media of best device