Three position fuel line check valve for relief of diurnal pressure
US7246607B2 · kind B2 · utility
9Cited by
6References
2Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 31, 2005 |
| Grant date | Jul 24, 2007 |
| Priority date | — |
| Expiry date | Oct 31, 2025 |
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.