flap valve

How to use flap valve in a sentence

• 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

• It is advisable to provide the bell with a blow or flap valve opening toward the interior.

  Gas-Engines and Producer-Gas Plants | R. E. Mathot

• Refrigerator waste pipes, except in tenement houses, and all safe-waste pipes, must have brass flap valve on the lower ends.

  Elements of Plumbing | Samuel Dibble

• The base of the funnel is closed by a flap valve C hinged at D.

  Acetylene, The Principles Of Its Generation And Use | F. H. Leeds

• 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