Description

A butterfly valve is a valve which can be used for isolating or regulating flow. The closing mechanism takes the form of a disk.

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• A butterfly valve is from a family of valves called quarter-turn valves.

• In operation, the valve is fully open or closed when the disc is rotated a quarter turn. The "butterfly" is a metal disc mounted on a rod.

• When the valve is closed, the disc is turned so that it completely blocks off the passageway. When the valve is fully open, the disc is rotated a quarter turn so that it allows an almost unrestricted passage of the fluid. The valve may also be opened incrementally to throttle flow.