equilibrium valve

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noun

(in a reciprocating engine) a valve opening a passage from one end of a cylinder to the other to equalize pressure upon both faces of the piston.

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Origin of equilibrium valve

First recorded in 1870–75

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
A tense, dynamic equilibrium between the U.S. and China seems more likely than a clear displacement of the former by the latter.
Why China Won’t Eclipse the United States|Ali Wyne|June 12, 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
But how many of us, thus sunk in despair, have not been vaulted back to equilibrium by another look at Groundhog Day?
Harold Ramis’s ‘Groundhog Day’ Is About as Perfect as a Movie Gets|Malcolm Jones|February 25, 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
Industrial society is therefore mobile, elastic, standing at any moment in a temporary and unstable equilibrium.
The Unsolved Riddle of Social Justice|Stephen Leacock
But the balanced forces once displaced would be seen constantly to come to an equilibrium at a new point.
The Unsolved Riddle of Social Justice|Stephen Leacock
It is a very simple plan, and will be perfectly tight; it is by restoring an equilibrium on both sides of the piston.
Life of Richard Trevithick, Volume II (of 2)|Francis Trevithick
Michael, for sudden joy and excitement, was wellnigh thrown from his equilibrium.
Blackwood's Edinburgh Magazine, No. CCCXXXIX. January, 1844. Vol. LV.|Various
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