escape cock

Noun
  1. 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 (synset 104134734)
    is a type of:
    • 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
    same as: escape, escape valve, relief valve, safety valve

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