因为阀瓣就像蝴蝶，因此也叫蝴蝶阀。
Because the valve is like a butterfly, also called the butterfly valve.
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。
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.
蝶阀上的这种旋转作用力取决于三个因素：(1)阀瓣与阀座密封的摩擦力；(2)轴承摩擦力；(3)动力矩。
This turning force in a butterfly valve is determined by three factors. (1) friction of the disc to seat for sealing (2) Bearing friction (3) Dynamic torque.
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