clack valve

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noun

a valve having a hinged flap permitting flow only in the direction in which the flap opens.

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Also called flap valve.

Origin of clack valve

First recorded in 1855–60

Such and such a time, such and such a day, then trouble with the valve.
Alfred Hitchcock’s Fade to Black: The Great Director’s Final Days|David Freeman|December 13, 2014|DAILY BEAST
The flawed valve was rapidly replaced by a more robust system.
The Exemplary Plane at the Heart of the MH370 Mystery|Clive Irving|March 27, 2014|DAILY BEAST
This safety valve allows citizens to sound the alarm and challenge those whose views are hateful and totalitarian.
The Opponents of Militant Islamism Are Often As Bigoted as Their Targets|Jacob Mchangama|December 7, 2013|DAILY BEAST
I need to get a head shot so he won't have a chance to clack himself off [blow himself up].
Meet the Man Who Killed Bin Laden|David Frum|February 11, 2013|DAILY BEAST

A look at some of the craziest, funniest, and most bizarre moments with Click and Clack.
‘Car Talk’ Hosts to Retire: Best Moments With NPR’s Laughing Mechanics|Caitlin Dickson|June 9, 2012|DAILY BEAST
A feed-pump forced water into the boilers; each had a safety-valve with a lever and weight.
Life of Richard Trevithick, Volume II (of 2)|Francis Trevithick
The valve-seat H has formed on its lower surface two crescent shaped long and narrow slits.
The Recent Revolution in Organ Building|George Laing Miller
The discharge-valve was then opened for a moment, allowing a blast of steam to escape, reducing the pressure say to one-half.
Life of Richard Trevithick, Volume II (of 2)|Francis Trevithick
The valve open while the plunger-pole ascended 20 inches, then went the remainder of the 10-feet stroke expansive.
Life of Richard Trevithick, Volume II (of 2)|Francis Trevithick
The engine boy having fixed the safety-valve while he fished for eels, caused an explosion of the boiler.
Life of Richard Trevithick, Volume II (of 2)|Francis Trevithick