Butterfly valves
US4836499A · kind A · utility
18Cited by
20References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 9, 1988 |
| Grant date | Jun 6, 1989 |
| Priority date | — |
| Expiry date | Aug 9, 2008 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16K1/228
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
The present invention comprises a transport system having an annular inflatable seal which has an annular interior domed portion which expands as an integral unit until it contacts the edge of a butterfly valve which engages the domed portion to form a slight recess in the annular seal which provides an airtight and locking seal with the annular seal having a pair of annular resilient legs operable to return the annular interior domed portion to its original position to permit the butterfly valve to be opened.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.