• Chambers's Twentieth Century Dictionary
    • Clack-valve a valve used in pumps, having a flap or a hinge which lifts up to let the fluid pass, but prevents the fluid from returning by falling back over the aperture
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Chambers's Twentieth Century Dictionary
From the sound.


In literature:

The sins o' four and forty years, all up an' down the seas, Clack an' repeat like valves half-fed.
"Verses 1889-1896" by Rudyard Kipling
The water is held in the cylinder by foot-valves or clack-valves.
"Farm Mechanics" by Herbert A. Shearer