Butterfly valve
US4817916A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 20, 1987 |
| Grant date | Apr 4, 1989 |
| Priority date | — |
| Expiry date | Nov 20, 2007 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16K1/24
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A butterfly valve wherein at least one cam is mounted on the valve shaft and located in a cam chamber associated with the valve disc. The cam cooperates with the cam chamber to rotate the valve disc between an open position and a closed position in alignment with and spaced from the valve seat at which point further rotation of the disc is prevented by stop means. The cam then further cooperates with the cam chamber to force the valve disc linearly into a seated position in engagement with the valve seat. Belleville springs engage the cam and force the valve disc away from engagement with the valve seat. A normal 90.degree. valve actuator may be used.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.