"snifting valve" meaning in English

{
  "etymology_text": "From the noise of its action.",
  "forms": [
    {
      "form": "snifting valves",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "snifting valve (plural snifting valves)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Rail transportation",
          "orig": "en:Rail transportation",
          "parents": [
            "Transport",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "1946 March and April, “The Why and The Wherefore: Snifting Valves”, in Railway Magazine, page 127:",
          "text": "The small mounting behind the chimney of many L.N.E.R. locomotives is the \"snifting\" valve, or vacuum relief valve, provided to keep the superheater elements cool when the engine is running with steam shut off. When the engine is steaming, these valves, which are carried in small chambers connecting with the superheater header, are kept closed by the pressure of the steam; but as soon as the regulator is shut, the valves open, and admit cold air to the superheater pipes. Apart from this provision, the latter, when empty of steam, would be in danger of burning out by the action of the hot gases surrounding them, especially at the firebox end.",
          "type": "quote"
        }
      ],
      "glosses": [
        "A small valve opening into the atmosphere from the cylinder or condenser of a steam engine, to allow the escape of air when the piston makes a stroke."
      ],
      "id": "en-snifting_valve-en-noun-SvNYqnEM",
      "links": [
        [
          "rail transport",
          "rail transport"
        ],
        [
          "valve",
          "valve"
        ],
        [
          "atmosphere",
          "atmosphere"
        ],
        [
          "cylinder",
          "cylinder"
        ],
        [
          "condenser",
          "condenser"
        ],
        [
          "steam engine",
          "steam engine"
        ],
        [
          "piston",
          "piston"
        ],
        [
          "stroke",
          "stroke"
        ]
      ],
      "raw_glosses": [
        "(rail transport) A small valve opening into the atmosphere from the cylinder or condenser of a steam engine, to allow the escape of air when the piston makes a stroke."
      ],
      "synonyms": [
        {
          "word": "blow valve"
        },
        {
          "word": "snifter valve"
        },
        {
          "word": "tail valve"
        }
      ],
      "topics": [
        "rail-transport",
        "railways",
        "transport"
      ]
    }
  ],
  "word": "snifting valve"
}

{
  "etymology_text": "From the noise of its action.",
  "forms": [
    {
      "form": "snifting valves",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "snifting valve (plural snifting valves)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with quotations",
        "Pages with 1 entry",
        "Pages with entries",
        "en:Rail transportation"
      ],
      "examples": [
        {
          "ref": "1946 March and April, “The Why and The Wherefore: Snifting Valves”, in Railway Magazine, page 127:",
          "text": "The small mounting behind the chimney of many L.N.E.R. locomotives is the \"snifting\" valve, or vacuum relief valve, provided to keep the superheater elements cool when the engine is running with steam shut off. When the engine is steaming, these valves, which are carried in small chambers connecting with the superheater header, are kept closed by the pressure of the steam; but as soon as the regulator is shut, the valves open, and admit cold air to the superheater pipes. Apart from this provision, the latter, when empty of steam, would be in danger of burning out by the action of the hot gases surrounding them, especially at the firebox end.",
          "type": "quote"
        }
      ],
      "glosses": [
        "A small valve opening into the atmosphere from the cylinder or condenser of a steam engine, to allow the escape of air when the piston makes a stroke."
      ],
      "links": [
        [
          "rail transport",
          "rail transport"
        ],
        [
          "valve",
          "valve"
        ],
        [
          "atmosphere",
          "atmosphere"
        ],
        [
          "cylinder",
          "cylinder"
        ],
        [
          "condenser",
          "condenser"
        ],
        [
          "steam engine",
          "steam engine"
        ],
        [
          "piston",
          "piston"
        ],
        [
          "stroke",
          "stroke"
        ]
      ],
      "raw_glosses": [
        "(rail transport) A small valve opening into the atmosphere from the cylinder or condenser of a steam engine, to allow the escape of air when the piston makes a stroke."
      ],
      "topics": [
        "rail-transport",
        "railways",
        "transport"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "blow valve"
    },
    {
      "word": "snifter valve"
    },
    {
      "word": "tail valve"
    }
  ],
  "word": "snifting valve"
}