{
  "$type": "site.standard.document",
  "description": "A nozzle needle (3) of a fuel injector (10) is driven in a controlled manner by changing back pressure applied thereto. The back pressure is controlled by a pressure control valve (102) driven by stacked piezoelectric elements (51). A valve body (11) of the pressure control valve is disposed in a…",
  "path": "/patents/1085890",
  "publishedAt": "2004-06-30T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "F02M47/027",
    "DENSO CORP [JP]"
  ],
  "textContent": "A nozzle needle (3) of a fuel injector (10) is driven in a controlled manner by changing back pressure applied thereto. The back pressure is controlled by a pressure control valve (102) driven by stacked piezoelectric elements (51). A valve body (11) of the pressure control valve is disposed in a valve chamber (21) having a drain port (22) and a high pressure port (23) which are selectively closed. A diameter D1 of a drain seat (14), a diameter D2 of a high pressure seat (15), and a diameter D3 of a piston portion (12) connected to the valve body are set to satisfy a relation: D1 ≥ D2 ≥ D3. In this manner, operation of the pressure control valve is stabilized, and thereby the fuel injector is smoothly and stably operated.",
  "title": "Pressure control valve for controlling operation of fuel injector"
}