Fuel line check valve system for relief of diurnal pressure
US7444995B2 · kind B2 · utility
1Cited by
5References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 23, 2007 |
| Grant date | Nov 4, 2008 |
| Priority date | — |
| Expiry date | May 23, 2027 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/7869
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
Prior art fuel line check valves remain closed after engine off and cool down. Diurnal heating and the resultant pressure increase in the fuel line causes fuel vapor emissions through small openings in the fuel line (e.g., at the injector tips). The invention provides a check valve for a vehicle fuel line which opens in response to engine cooling and remains open while the engine is off to relieve subsequent increasing pressure in the fuel line due to diurnal heating thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.