vacuum valve
noun1
A non-return valve allowing atmospheric air into a boiler, if a cold boiler reduces its internal pressure on cooling down.
Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.
noun
A non-return valve allowing atmospheric air into a boiler, if a cold boiler reduces its internal pressure on cooling down.
Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.
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