"retaining valve" meaning in English

{
  "forms": [
    {
      "form": "retaining valves",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "retaining valve (plural retaining 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": "Mechanical engineering",
          "orig": "en:Mechanical engineering",
          "parents": [
            "Engineering",
            "Applied sciences",
            "Technology",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Rail transportation",
          "orig": "en:Rail transportation",
          "parents": [
            "Transport",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A device that retains some air pressure in a train's air brake cylinders even when the automatic brake valve is set to the fully-released position, used on steep downgrades to allow a degree of continuous braking effort to be maintained without depleting the pressure in the train's brakepipe (which would result in the loss of nearly all braking ability, causing a runaway)."
      ],
      "id": "en-retaining_valve-en-noun-G9LjpdFH",
      "links": [
        [
          "rail transport",
          "rail transport"
        ],
        [
          "mechanical engineering",
          "mechanical engineering"
        ],
        [
          "air",
          "air"
        ],
        [
          "pressure",
          "pressure"
        ],
        [
          "train",
          "train"
        ],
        [
          "air brake",
          "air brake"
        ],
        [
          "cylinder",
          "cylinder"
        ],
        [
          "downgrade",
          "downgrade"
        ],
        [
          "depleting",
          "deplete"
        ],
        [
          "brakepipe",
          "brakepipe"
        ],
        [
          "runaway",
          "runaway"
        ]
      ],
      "raw_glosses": [
        "(rail transport, mechanical engineering) A device that retains some air pressure in a train's air brake cylinders even when the automatic brake valve is set to the fully-released position, used on steep downgrades to allow a degree of continuous braking effort to be maintained without depleting the pressure in the train's brakepipe (which would result in the loss of nearly all braking ability, causing a runaway)."
      ],
      "synonyms": [
        {
          "word": "retainer"
        }
      ],
      "topics": [
        "engineering",
        "mechanical",
        "mechanical-engineering",
        "natural-sciences",
        "physical-sciences",
        "rail-transport",
        "railways",
        "transport"
      ]
    }
  ],
  "word": "retaining valve"
}

{
  "forms": [
    {
      "form": "retaining valves",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "retaining valve (plural retaining 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",
        "en:Mechanical engineering",
        "en:Rail transportation"
      ],
      "glosses": [
        "A device that retains some air pressure in a train's air brake cylinders even when the automatic brake valve is set to the fully-released position, used on steep downgrades to allow a degree of continuous braking effort to be maintained without depleting the pressure in the train's brakepipe (which would result in the loss of nearly all braking ability, causing a runaway)."
      ],
      "links": [
        [
          "rail transport",
          "rail transport"
        ],
        [
          "mechanical engineering",
          "mechanical engineering"
        ],
        [
          "air",
          "air"
        ],
        [
          "pressure",
          "pressure"
        ],
        [
          "train",
          "train"
        ],
        [
          "air brake",
          "air brake"
        ],
        [
          "cylinder",
          "cylinder"
        ],
        [
          "downgrade",
          "downgrade"
        ],
        [
          "depleting",
          "deplete"
        ],
        [
          "brakepipe",
          "brakepipe"
        ],
        [
          "runaway",
          "runaway"
        ]
      ],
      "raw_glosses": [
        "(rail transport, mechanical engineering) A device that retains some air pressure in a train's air brake cylinders even when the automatic brake valve is set to the fully-released position, used on steep downgrades to allow a degree of continuous braking effort to be maintained without depleting the pressure in the train's brakepipe (which would result in the loss of nearly all braking ability, causing a runaway)."
      ],
      "topics": [
        "engineering",
        "mechanical",
        "mechanical-engineering",
        "natural-sciences",
        "physical-sciences",
        "rail-transport",
        "railways",
        "transport"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "retainer"
    }
  ],
  "word": "retaining valve"
}