{
  "$type": "site.standard.document",
  "coverImage": {
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  "description": "A rail-vehicle ventilation system that reduces discomfort, felt by passengers, resulting from sudden changes of the vehicle-internal pressure when the vehicle-external pressure changes suddenly, without stopping ventilation for a long time, shuts off an air-supply valve and an exhaust valve in a…",
  "path": "/patents/1413414",
  "publishedAt": "2024-12-18T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "B60H1/00371",
    "HITACHI LTD [JP]"
  ],
  "textContent": "A rail-vehicle ventilation system that reduces discomfort, felt by passengers, resulting from sudden changes of the vehicle-internal pressure when the vehicle-external pressure changes suddenly, without stopping ventilation for a long time, shuts off an air-supply valve and an exhaust valve in a case where a variation in the vehicle-external pressure is equal to or larger than a tolerance, and opens the air-supply valve and the exhaust valve in a case where the pressure difference between the outside of the vehicle and the inside of the vehicle is within a tolerance range. Thereby, the rail-vehicle ventilation system suppresses propagation of a sudden pressure change outside the vehicle to the inside of the vehicle without stopping ventilation for a long time.",
  "title": "VENTILATION DEVICE FOR RAILWAY VEHICLES"
}