Butterfly valve
US5158265A · kind A · utility
20Cited by
4References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 16, 1991 |
| Grant date | Oct 27, 1992 |
| Priority date | — |
| Expiry date | May 16, 2011 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16K1/222
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
At the outer-periphery contact portion of a butterfly disk of a butterfly valve, the sealing area closest to the shaft is formed smaller than other sealing areas. Thus, when the valve is closed by the butterfly disk, the outer-periphery contact portion of the butterfly disk almost simultaneously starts contacting a seat ring throughout the periphery because the area of the portion is smaller than other sealing areas. Therefore, the sealing effect for a long time is expected because the shaft is hardly scratched and the seat ring is hardly abraded.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.