flap valve
noun
Origin of flap valve
First recorded in 1865–70
Words nearby flap valve
flanny,
flap,
flap amputation,
flap door,
flap operation,
flap valve,
flapdoodle,
flapdragon,
flaperon,
flapjack,
flapless amputation
Example sentences from the Web for flap valve
At o is a delivery valve, opening outwards, which is often a ball-valve but sometimes a flap-valve.
This blow-hole has a flap-valve, which the noxious blast opens, as often as it passes out.
De Re Metallica |Georgius AgricolaA 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