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SINCE 1828
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flap valve

noun
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variants: or less commonly flapper valve

Definition of flap valve

: a valve (as in a pump) composed of a disk hinged on one edge and swinging one way only

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“Flap valve.” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/flap%20valve. Accessed 25 January 2020.

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