Metal seal structure
US4398695A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 29, 1981 |
| Grant date | Aug 16, 1983 |
| Priority date | — |
| Expiry date | Dec 29, 2001 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/1812
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A sealing structure for use in valves, including butterfly valves, having a body with a flow passage and a movable valve disc in the flow passage. Two sealing surfaces are mounted in the body to engage the disc when it is in a closed position to provide a bubble-tight seal. The sealing structure includes an annular seal retaining cavity with a slot opening to the flow passage. A metal seal ring having a lip portion (which has a first seat) projecting through the slot into the passage is contained within the cavity adjacent to a primary heat-destructible seal ring, which has a second seat. The first seat and the second seat are engageable with the sealing surface of the disc to provide two axial seals. When the valve is closed, a radially-directed force is developed at the second seat (on the heat-destructible seal) and at the first seat (on the lip portion of the metal seal) in response to contact with the disc to effect a heat-destructible seal and a second, metal-to-metal seal, respectively. In another embodiment, a C-ring, O-ring, or other suitable support means is used in place of the heat-destructible seal to hold the metal seal in position. In this embodiment the metal-to-met…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.