Check valve having internal float
US5318407A · kind A · utility
2Cited by
21References
17Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 8, 1992 |
| Grant date | Jun 7, 1994 |
| Priority date | — |
| Expiry date | Sep 8, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/7927
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
The present invention provides a check valve which, when placed at the end of a pump suction pipe, allows the pump to draw fluid therethrough from a continuously replenished, below-ground fluid source. When the fluid in the fluid source has been depleted to a level below that which allows fluid to be drawn therefrom by the pump, the present check valve maintains the suction pipe full of fluid. The check valve also maintains the suction pipe full of fluid when the pump has been shut off. In this manner, the pump can resume drawing fluid from the fluid source without the need for priming.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.