safety valve

Coffee aficionados who monitor the temperature of their coffee drinks like the safety valve of a nuclear reactor will probably be happier with hot milk.

According to a company report, when water gushed into a drum holding hot coke — an oil byproduct — the reaction triggered a safety valve that relieved the pressure.

The field hospital was built, in part, as a safety valve for times like this.

This safety valve allows citizens to sound the alarm and challenge those whose views are hateful and totalitarian.

[W] thout an exchange-rate safety valve you need an alternate way to rebalance economies.

A feed-pump forced water into the boilers; each had a safety-valve with a lever and weight.

The engine boy having fixed the safety-valve while he fished for eels, caused an explosion of the boiler.

But Judge Leslie understood and had much sympathy for his pupil—possibly believed in the virtue of the safety-valve.

Variance appeared to be necessary to their existence; a safety-valve, for the ill humors they could not throw out upon others.

These he set in the embers, by the side of the former, first opening a safety-valve in each.