Fire tested butterfly valve
US4202365A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 4, 1978 |
| Grant date | May 13, 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 an annular resilient seat member and an annular, flexible metal seat member, both held in place in a valve housing by being clamped between cooperating surfaces of the valve housing and a valve seat retaining ring insert. In a first embodiment, a fusible washer with a lower destruction temperature than that of the annular resilient seat is positioned between the resilient seat and the metal seat. In a second embodiment, an integrally formed protrusion on the annular resilient seat contacts the metal seat. In both embodiments, the metal seat is held out of contact with the butterfly disc until exposure to a fire melts the fusible washer or the seat protrusion, at which time the metal seat comes into contact with the disc to establish a secondary, metal-to-metal, fire resistant seal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.