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Butterfly valve is closed parts ( valve flap or disc for disc ), around the valve axis of rotation to achieve the open and close a valve, in the pipeline mainly as shut off and throttling effect. 蝶阀是指关闭件(阀瓣或蝶板)为圆盘,围绕阀轴旋转来达到开启与关闭的一种阀,在管道上主要起切断和节流作用。