"jockey valve" meaning in English

{
  "forms": [
    {
      "form": "jockey valves",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "jockey valve (plural jockey 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"
        }
      ],
      "examples": [
        {
          "ref": "1946 March and April, “The Why and The Wherefore: Jockey-Valves”, in Railway Magazine, page 129",
          "text": "Jockey-valves of locomotive regulators are small auxiliary ports which can be opened by a suitable movement of the regulator-handle, when it is desired to pass no more than a limited amount of steam to the cylinders, as, for example, over level or slightly falling track with light loads. A jockey-valve enables such working to be conducted with more precision than is possible by a partial opening of the main regulator valve.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "A manually-controlled auxiliary valve on the regulator of a steam engine to control smaller amounts of steam than can be managed by the main valve."
      ],
      "id": "en-jockey_valve-en-noun-uT6vZaHg"
    }
  ],
  "word": "jockey valve"
}

{
  "forms": [
    {
      "form": "jockey valves",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "jockey valve (plural jockey 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"
      ],
      "examples": [
        {
          "ref": "1946 March and April, “The Why and The Wherefore: Jockey-Valves”, in Railway Magazine, page 129",
          "text": "Jockey-valves of locomotive regulators are small auxiliary ports which can be opened by a suitable movement of the regulator-handle, when it is desired to pass no more than a limited amount of steam to the cylinders, as, for example, over level or slightly falling track with light loads. A jockey-valve enables such working to be conducted with more precision than is possible by a partial opening of the main regulator valve.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "A manually-controlled auxiliary valve on the regulator of a steam engine to control smaller amounts of steam than can be managed by the main valve."
      ]
    }
  ],
  "word": "jockey valve"
}