Fire safe butterfly valve
US4228816A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 4, 1978 |
| Grant date | Oct 21, 1980 |
| Priority date | — |
| Expiry date | Jan 4, 1998 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/1797
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
Disclosed is a fire-tested butterfly valve having a resilient flexible seat member held in place in a valve housing by being clamped between cooperating surfaces of the valve housing and a valve seat retaining ring insert. Also positioned between the housing and the insert is a fusible washer means which has a lower destruction temperature than that of the annular flexible seat. Further, the insert is spring biased toward the fusible washer and valve housing so that when the valve is exposed to fire the fusible washer melts, the insert is biased toward the housing, and as the annular flexible seat is destroyed by heat, an edge of the insert into contact with the butterfly disc to establish a secondary, metal-to-metal, fire resistant seal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.