"clack valve" meaning in English

{
  "forms": [
    {
      "form": "clack valves",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "clack valve (plural clack 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": "Engineering",
          "orig": "en:Engineering",
          "parents": [
            "Applied sciences",
            "Technology",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "1946 March and April, “The Why and The Wherefore: Clack-Boxes”, in Railway Magazine, page 129:",
          "text": "The connecting pipe between a locomotive injector and the boiler, through which the water is forced into the boiler against the steam pressure within, is provided with a \"clack-valve,\" which allows the water to pass in the inward direction only and not the outward; this is housed in a \"clack-box\". No question of \"advantages or disadvantages\" attaches to the use of a clack-box; it is a necessary part of locomotive equipment.",
          "type": "quote"
        },
        {
          "ref": "1959 September, P. Ransome-Wallis, “The British Railways Class \"9\" 2-10-0s”, in Trains Illustrated, page 420:",
          "text": "The feed water enters the back and cool end of the preheater and passes forward to the front and hot end, after which it enters the boiler through a clack valve.",
          "type": "quote"
        }
      ],
      "glosses": [
        "A valve; especially one hinged at one edge, which, when raised from its seat, falls with a clacking sound."
      ],
      "id": "en-clack_valve-en-noun-hUB2qntw",
      "links": [
        [
          "engineering",
          "engineering#Noun"
        ],
        [
          "valve",
          "valve"
        ],
        [
          "hinged",
          "hinged"
        ],
        [
          "seat",
          "seat"
        ]
      ],
      "raw_glosses": [
        "(engineering) A valve; especially one hinged at one edge, which, when raised from its seat, falls with a clacking sound."
      ],
      "related": [
        {
          "word": "clack box"
        }
      ],
      "topics": [
        "engineering",
        "natural-sciences",
        "physical-sciences"
      ]
    }
  ],
  "word": "clack valve"
}

{
  "forms": [
    {
      "form": "clack valves",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "clack valve (plural clack valves)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "clack box"
    }
  ],
  "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:Engineering"
      ],
      "examples": [
        {
          "ref": "1946 March and April, “The Why and The Wherefore: Clack-Boxes”, in Railway Magazine, page 129:",
          "text": "The connecting pipe between a locomotive injector and the boiler, through which the water is forced into the boiler against the steam pressure within, is provided with a \"clack-valve,\" which allows the water to pass in the inward direction only and not the outward; this is housed in a \"clack-box\". No question of \"advantages or disadvantages\" attaches to the use of a clack-box; it is a necessary part of locomotive equipment.",
          "type": "quote"
        },
        {
          "ref": "1959 September, P. Ransome-Wallis, “The British Railways Class \"9\" 2-10-0s”, in Trains Illustrated, page 420:",
          "text": "The feed water enters the back and cool end of the preheater and passes forward to the front and hot end, after which it enters the boiler through a clack valve.",
          "type": "quote"
        }
      ],
      "glosses": [
        "A valve; especially one hinged at one edge, which, when raised from its seat, falls with a clacking sound."
      ],
      "links": [
        [
          "engineering",
          "engineering#Noun"
        ],
        [
          "valve",
          "valve"
        ],
        [
          "hinged",
          "hinged"
        ],
        [
          "seat",
          "seat"
        ]
      ],
      "raw_glosses": [
        "(engineering) A valve; especially one hinged at one edge, which, when raised from its seat, falls with a clacking sound."
      ],
      "topics": [
        "engineering",
        "natural-sciences",
        "physical-sciences"
      ]
    }
  ],
  "word": "clack valve"
}