Automatic liquid pump with vapor flow prevention flow outlet valve
US5366349A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 25, 1993 |
| Grant date | Nov 22, 1994 |
| Priority date | — |
| Expiry date | Jun 25, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/7326
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An automatic liquid pump contained within a sealed pressure vessel. The pressure vessel includes a liquid inlet opening, a liquid outlet opening, a gas inlet and a gas outlet. A preloaded float-operated over-center valve mechanism closes the gas inlet valve and opens the gas outlet valve to permit vapor to vent through the gas outlet valve. The over-center valve mechanism alternately closes the gas outlet valve and opens the gas inlet valve to admit compressed gas into the sealed vessel to evacuate the liquid within the sealed vessel through the liquid outlet opening. A float valve is coupled to the liquid outlet opening for closing the liquid outlet opening when the liquid in the vessel drops below a first predetermined level. As a result, vapors are prevented from escaping through the liquid outlet opening under all operating conditions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.