Vacuum check valve
US4499916A · kind A · utility
14Cited by
10References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 31, 1983 |
| Grant date | Feb 19, 1985 |
| Priority date | — |
| Expiry date | Jan 31, 2003 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/2546
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A vacuum check valve comprising a single umbrella valve responding to vacuum differences between the input and output of the check valve. The check valve directs the output line to feed a vacuum operated device with either the vacuum source or reference air through a bleed passage. The umbrella shaped valve eliminates the requirement for a diaphragm operated poppet valve.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.