1. safety valve - Noun
2. safety valve - Verb
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
Source: WordNetsafety-valve
I don't believe in life after death. But I do believe in some grinding destiny that watches over us on earth. If I didn't, the safety valve would give and the boiler would explode. Hedy Lamarr
It's the safety valve of middle life, and the solace of age. Mary Roberts Rinehart
No matter how much restriction civilization imposes on the individual, he nevertheless finds some way to circumvent it. Wit is the best safety valve modern man has evolved the more civilization, the more repression, the more need there is for wit. Sigmund Freud
“A living experiment meaning that we are seeing in these very particular times if people use this and it keeps them safe and if it acts as a safety valve in many different respects and it will help us make decisions for the long-term.” Source: Internet
"If not, you're taking away a safety valve." Source: Internet
For first generation pressure cookers with a weighted valve or "jiggler", the primary safety valve or regulator is usually a weighted stopper, commonly called "the rocker" or "vent weight". Source: Internet