Butterfly valve through the valve shaft rotation to drive the rotation of a disc-shaped disc, to open and close a valve, cut off from the main pipe and throttle with.

进口蝶阀是指通过阀轴旋转来带动一个圆盘形的蝶板的转动，达到开启与关闭的一种阀门，在管道上主要起切断和节流用。

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The only "wire" involved is the string previously rotating the throttle valve, which now is employed to rotate the Control Shaft (s), and this is all.

唯一的“线”涉及的是以前的字符串旋转节流阀，现在是用来控制旋转轴(s)，而这就是一切。

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