Vacuum-assisted pump
USRE39813E1 · kind E1 · reissue
3Cited by
7References
24Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 8, 2004 |
| Grant date | Sep 4, 2007 |
| Priority date | — |
| Expiry date | Oct 8, 2024 |
Classification
- Technology area (CPC —)General
Abstract
A self-priming centrifugal pump including a supplementary vacuum pump and a float valve. The vacuum pump serves to draw liquid to the pump for priming and the float valve shut of flow to the vacuum pump when liquid reaches a predetermined level to prevent entry of liquid into the vacuum pump. In some embodiments the float valve includes an o-ring valve seal and the vacuum pump includes an oil delivery system to distribute oil from an oil reservoir to improve lubrication.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.