escape valve

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Noun1.Escape valve - a valve in a container in which pressure can build up (as a steam boiler)escape valve - a valve in a container in which pressure can build up (as a steam boiler); it opens automatically when the pressure reaches a dangerous level
regulator - any of various controls or devices for regulating or controlling fluid flow, pressure, temperature, etc.
valve - control consisting of a mechanical device for controlling the flow of a fluid
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References in classic literature ?
There is no visible deck, even: nothing but a long, black, ugly roof covered with burnt-out feathery sparks; above which tower two iron chimneys, and a hoarse escape valve, and a glass steerage-house.
Hissing like the escape valve of a steam engine, the mighty creature fell turning and twisting into the sea below, my arrow buried completely in its carcass.
Opening the buoyancy escape valves I permitted her to come slowly to the ground, and as she touched, Dejah Thoris and I stepped from her deck and, hand in hand, turned back across the frozen waste toward the city of Kadabra.
This is done to alleviate any guilt in taking a life and giving the soldiers' conscience an escape valve. Never has it happened that all the weapons were loaded with duds.
With an embargo in place, the next exodus is being plotted as we speak, and like Fidel and RaE[bar]l Castro once did, the Venezuelan dictator will encourage it as the escape valve he needs for hardship and discontent.
It has a super thick 5mm crystal and a helium escape Valve (something only a serious diver would ever need).
Since many couples are beset with misunderstanding and unresolved conflicts, there must be an escape valve in marriage--divorce.
Yet even the overtly protectionist anti-dumping measures allowed under existing trade rules have not been overly damaging to trade, while providing an escape valve for political pressure.
Precisely the same thoughts occur to an individual when it is time to die, but transposed to the collective fate of humanity there always seems to be an escape valve in the form of survivors.
Clark's five-minutes-to-midnight 'intervention' just before the bid deadline - with so called 'binding commitments' from Melrose and one voluntary offer -- really amounts to a political escape valve to let him not block the deal under existing powers.
There is an automatic helium escape valve on the right-hand side of the case for saturation diving.
At a December meeting of the Senate Criminal Justice Committee, Brandes was careful to remind his colleagues that the measure doesn't do away with minimum mandatories, and that the escape valve would be rarely used, since most trafficking cases end in plea bargains.