{
  "$type": "site.standard.document",
  "description": "Valve device, especially for a secondary air system of an internal combustion engine, which produces a fluid connection between an inlet channel and an outlet channel on lifting a valve-closing body from a valve seat comprises in the region of the valve seat at least one element (21) whose shape is…",
  "path": "/patents/1091203",
  "publishedAt": "2003-12-10T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "F01N3/22",
    "PIERBURG GMBH [DE]"
  ],
  "textContent": "Valve device, especially for a secondary air system of an internal combustion engine, which produces a fluid connection between an inlet channel and an outlet channel on lifting a valve-closing body from a valve seat comprises in the region of the valve seat at least one element (21) whose shape is changed by certain conditions. Preferred Features: The element extends or vibrates when air flows by and is a piezo generator. The element has a negative thermal expansion coefficient at temperatures below 0degreesC, i.e. it extends as the temperature drops, and is made of a carbon fiber composite.",
  "title": "Valve device"
}