"valve gear" meaning in English

{
  "forms": [
    {
      "form": "valve gears",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "~"
      },
      "expansion": "valve gear (countable and uncountable, plural valve gears)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "langcode": "en",
          "name": "Mechanical engineering",
          "orig": "en:Mechanical engineering",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "bold_text_offsets": [
            [
              38,
              48
            ]
          ],
          "ref": "1956 April, “\"Merchant Navy\" Class Pacific Modified”, in Railway Magazine, page 209:",
          "text": "Three independent sets of Walschaerts valve gear are provided, those for the outside cylinders being driven by return cranks placed on the driving crankpins, and by crosshead arms attached to the crossheads.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "The mechanism of a steam engine that operates the inlet and exhaust valves to admit steam into the cylinder and allow exhaust steam to escape, respectively, at the correct points in the cycle."
      ],
      "id": "en-valve_gear-en-noun-u8-xe~jP",
      "links": [
        [
          "mechanical engineering",
          "mechanical engineering"
        ],
        [
          "mechanism",
          "mechanism"
        ],
        [
          "steam engine",
          "steam engine"
        ],
        [
          "inlet",
          "inlet valve"
        ],
        [
          "exhaust valve",
          "exhaust valve"
        ],
        [
          "steam",
          "steam"
        ],
        [
          "cylinder",
          "cylinder"
        ],
        [
          "exhaust",
          "exhaust"
        ],
        [
          "cycle",
          "cycle"
        ]
      ],
      "raw_glosses": [
        "(mechanical engineering) The mechanism of a steam engine that operates the inlet and exhaust valves to admit steam into the cylinder and allow exhaust steam to escape, respectively, at the correct points in the cycle."
      ],
      "tags": [
        "countable",
        "uncountable"
      ],
      "topics": [
        "engineering",
        "mechanical",
        "mechanical-engineering",
        "natural-sciences",
        "physical-sciences"
      ]
    }
  ],
  "word": "valve gear"
}

{
  "forms": [
    {
      "form": "valve gears",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "~"
      },
      "expansion": "valve gear (countable and uncountable, plural valve gears)",
      "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",
        "English uncountable nouns",
        "Pages with 1 entry",
        "Pages with entries",
        "en:Mechanical engineering"
      ],
      "examples": [
        {
          "bold_text_offsets": [
            [
              38,
              48
            ]
          ],
          "ref": "1956 April, “\"Merchant Navy\" Class Pacific Modified”, in Railway Magazine, page 209:",
          "text": "Three independent sets of Walschaerts valve gear are provided, those for the outside cylinders being driven by return cranks placed on the driving crankpins, and by crosshead arms attached to the crossheads.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "The mechanism of a steam engine that operates the inlet and exhaust valves to admit steam into the cylinder and allow exhaust steam to escape, respectively, at the correct points in the cycle."
      ],
      "links": [
        [
          "mechanical engineering",
          "mechanical engineering"
        ],
        [
          "mechanism",
          "mechanism"
        ],
        [
          "steam engine",
          "steam engine"
        ],
        [
          "inlet",
          "inlet valve"
        ],
        [
          "exhaust valve",
          "exhaust valve"
        ],
        [
          "steam",
          "steam"
        ],
        [
          "cylinder",
          "cylinder"
        ],
        [
          "exhaust",
          "exhaust"
        ],
        [
          "cycle",
          "cycle"
        ]
      ],
      "raw_glosses": [
        "(mechanical engineering) The mechanism of a steam engine that operates the inlet and exhaust valves to admit steam into the cylinder and allow exhaust steam to escape, respectively, at the correct points in the cycle."
      ],
      "tags": [
        "countable",
        "uncountable"
      ],
      "topics": [
        "engineering",
        "mechanical",
        "mechanical-engineering",
        "natural-sciences",
        "physical-sciences"
      ]
    }
  ],
  "word": "valve gear"
}