"piston valve" meaning in English

{
  "forms": [
    {
      "form": "piston valves",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "piston valve (plural piston 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": "topical",
          "langcode": "en",
          "name": "Mechanisms",
          "orig": "en:Mechanisms",
          "parents": [
            "Machines",
            "Technology",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "1898, “A Plea for the Piston Valve”, in Bulletin of the International Railway Congress Association, volume 12",
          "text": "We already know that a balanced slide valve requires about half as much power to move it as an unbalanced valve, but the piston valve requires only about half as much as the balanced valve.",
          "type": "quotation"
        },
        {
          "ref": "1944 November and December, “Conversion of L.N.E.R. \"B16\" Class 4-6-0 Locomotives”, in Railway Magazine, page 349",
          "text": "The three cylinders of these engines are 18½ in. dia. by 26 in. stroke; and as the three piston valves were all between the frames, it resulted in the monoblock casting being weak, so far as the centre cylinder was concerned, with the result that the life of these castings left a good deal to be desired.",
          "type": "quotation"
        },
        {
          "ref": "2009, Mark C. Ely, Amy E. Van Deuren, Wind Talk for Brass, Types of Valves",
          "text": "Piston valves move up and down by means of a spring lining up holes or wind ways in the piston with holes in additional lengths of tubing.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "A valve which uses a hollow or double piston sliding in a cylinder to direct fluid along one of two paths"
      ],
      "id": "en-piston_valve-en-noun-qdttyz4l",
      "links": [
        [
          "valve",
          "valve"
        ],
        [
          "piston",
          "piston"
        ],
        [
          "sliding",
          "sliding"
        ],
        [
          "cylinder",
          "cylinder"
        ]
      ],
      "translations": [
        {
          "code": "ru",
          "lang": "Russian",
          "roman": "zolotnikóvyj klápan",
          "sense": "Translations",
          "tags": [
            "masculine"
          ],
          "topics": [
            "engineering",
            "physical-sciences",
            "natural-sciences"
          ],
          "word": "золотнико́вый кла́пан"
        },
        {
          "code": "ru",
          "lang": "Russian",
          "roman": "zolotník",
          "sense": "Translations",
          "topics": [
            "engineering",
            "physical-sciences",
            "natural-sciences"
          ],
          "word": "золотни́к"
        },
        {
          "code": "ru",
          "english": "musical instruments",
          "lang": "Russian",
          "roman": "pómpovyj véntilʹ",
          "sense": "Translations",
          "tags": [
            "masculine"
          ],
          "word": "по́мповый ве́нтиль"
        }
      ],
      "wikipedia": [
        "piston valve"
      ]
    }
  ],
  "word": "piston valve"
}

{
  "forms": [
    {
      "form": "piston valves",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "piston valve (plural piston 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",
        "Translation table header lacks gloss",
        "en:Mechanisms"
      ],
      "examples": [
        {
          "ref": "1898, “A Plea for the Piston Valve”, in Bulletin of the International Railway Congress Association, volume 12",
          "text": "We already know that a balanced slide valve requires about half as much power to move it as an unbalanced valve, but the piston valve requires only about half as much as the balanced valve.",
          "type": "quotation"
        },
        {
          "ref": "1944 November and December, “Conversion of L.N.E.R. \"B16\" Class 4-6-0 Locomotives”, in Railway Magazine, page 349",
          "text": "The three cylinders of these engines are 18½ in. dia. by 26 in. stroke; and as the three piston valves were all between the frames, it resulted in the monoblock casting being weak, so far as the centre cylinder was concerned, with the result that the life of these castings left a good deal to be desired.",
          "type": "quotation"
        },
        {
          "ref": "2009, Mark C. Ely, Amy E. Van Deuren, Wind Talk for Brass, Types of Valves",
          "text": "Piston valves move up and down by means of a spring lining up holes or wind ways in the piston with holes in additional lengths of tubing.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "A valve which uses a hollow or double piston sliding in a cylinder to direct fluid along one of two paths"
      ],
      "links": [
        [
          "valve",
          "valve"
        ],
        [
          "piston",
          "piston"
        ],
        [
          "sliding",
          "sliding"
        ],
        [
          "cylinder",
          "cylinder"
        ]
      ],
      "wikipedia": [
        "piston valve"
      ]
    }
  ],
  "translations": [
    {
      "code": "ru",
      "lang": "Russian",
      "roman": "zolotnikóvyj klápan",
      "sense": "Translations",
      "tags": [
        "masculine"
      ],
      "topics": [
        "engineering",
        "physical-sciences",
        "natural-sciences"
      ],
      "word": "золотнико́вый кла́пан"
    },
    {
      "code": "ru",
      "lang": "Russian",
      "roman": "zolotník",
      "sense": "Translations",
      "topics": [
        "engineering",
        "physical-sciences",
        "natural-sciences"
      ],
      "word": "золотни́к"
    },
    {
      "code": "ru",
      "english": "musical instruments",
      "lang": "Russian",
      "roman": "pómpovyj véntilʹ",
      "sense": "Translations",
      "tags": [
        "masculine"
      ],
      "word": "по́мповый ве́нтиль"
    }
  ],
  "word": "piston valve"
}