Origin of safety valve
Examples from the Web for safety valve
It was a safety-valve which had worked satisfactorily at the right moment.The Twins of Suffering Creek|Ridgwell Cullum
Colonel Waring treated religious controversy as his safety-valve and needed no encouragement.Lady Lilith|Stephen McKenna
A provision is likewise made by which the steam escaping at the safety-valve is condensed and carried away to the feeding cistern.The Steam Engine Explained and Illustrated (Seventh Edition)|Dionysius Lardner
Their excretion seems to be in a certain sense a safety-valve function.
The man has a fervent and untrained imagination, which has never, in the practicalities of oil, had a safety-valve.The Story of an Untold Love|Paul Leicester Ford