flap valve

noun

1. clack valve.

Word History and Origins

Origin of flap valve¹

First recorded in 1865–70

Example Sentences

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

From Project Gutenberg

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

From Project Gutenberg

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

From Project Gutenberg

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

From Project Gutenberg

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

From Project Gutenberg