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出典:Wiktionary
From the noise of its action.
snifting valve (複数形 snifting valves)
出典:Wikipedia
出典:『Wikipedia』 (2011/01/02 22:00 UTC 版)
A snifting valve (sometimes snifter valve) is an automatic anti-vacuum valve used in a steam locomotive when coasting. The word Snift imitates the sound made by the valve.
snifting valve