Ecology valve and system in an aircraft engine fuel system
US6619025B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 14, 2001 |
| Grant date | Sep 16, 2003 |
| Priority date | — |
| Expiry date | Dec 14, 2021 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T50/60
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
The present invention is directed toward an ecology valve that drains working fuel to the sump chamber of the ecology valve upon engine shut down. The ecology valve has a piston slidable in the piston chamber between shut-off and run positions. The piston divides the piston chamber into a sump chamber and an actuation chamber. Upon engine shut down, the piston slides toward the shut-off position and suctions sufficient fuel from the fuel manifold into the sump chamber to prevent coking of the nozzles. Upon the next engine start up, the actuation chamber is pressurized which drives the piston toward the run position and returns fuel contained in sump chamber to the fuel manifold. A drain passageway opens and fluidically connects the actuation chamber to sump chamber when the piston is sliding toward the shut-off position which allows fuel contained in the actuation chamber to drain to the sump chamber.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.