A Butterfly Valve is a cylindrical housing, which can resemble a tube or a disk. A metal rod passes across the cylinder, when viewed from the end, following the diameter line of the circles formed by the ends of the cylinder. A circular, metal disk that fits very precisely within the cylinder is mounted on the rod, and the rod and disk assembly pivot. The disk of metal that forms the valve vaguely resembles a Butterfly, with the metal rod representing the body and each half of the metal disk representing the wings, and is the source of the name of this type of valve.

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