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What is a ‘butterfly valve’?

- Mar 23, 2018 -

A flat plate, usually made of metal and round material, is mounted on a shaft across its diameter so that when the shaft is twisted, the plate is rotated through 90 degrees. The end of the shaft is mounted in a circular tube that allows the plate (butterfly) to open or close the tube.


It’s an apparatus with an actuated disk-shaped componet that opens and closes to regulate the the flow of a fluid.

For example, a carburetor has a butterfly valve that opens to allows an air/fuel mixture into the cylinders and closes (not entirely, as air still needs to get in) when idling.


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