Dictionary.com
definitions
  • synonyms

flap valve

See more synonyms on Thesaurus.com
noun
  1. clack valve.
Show More

Origin of flap valve

First recorded in 1865–70
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for flap valve

Historical Examples

  • At o is a delivery valve, opening outwards, which is often a ball-valve but sometimes a flap-valve.

    Encyclopaedia Britannica, 11th Edition, Volume 14, Slice 1

    Various

  • A flap-valve nailed over a scupper-hole, serving to keep water from getting in, yet letting it out.

    The Sailor's Word-Book

    William Henry Smyth

  • This blow-hole has a flap-valve, which the noxious blast opens, as often as it passes out.

    De Re Metallica

    Georgius Agricola