Seal assembly for butterfly valve
US4162782A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 10, 1978 |
| Grant date | Jul 31, 1979 |
| Priority date | — |
| Expiry date | Apr 10, 1998 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16K1/2263
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A butterfly valve has a valve body with an improved seal assembly mounted in the groove about a flow passage in the valve body. The seal assembly has an outer metal body including a pair of spaced inner legs having outer ends thereof in sealing contact with the outer periphery of a valve disc in the closed position of the valve disc to provide a pair of spaced metal sealing surfaces with the outer periphery of the disc. An elastomeric face seal is positioned between the two spaced inner legs in sealing contact between the spaced metal sealing surfaces with the outer peripheral sealing surface of the valve disc at low pressures. An upstream inner leg is urged inwardly toward the downstream inner leg to space the upstream leg from the adjacent surface defining the groove and permit the upstream pressure to be exposed between the inner and outer upstream resilient legs thereby to urge the upstream leg tightly into contact with the adjacent peripheral sealing surface of the valve disc in the closed position thereof. The outer resilient legs are seated in the bottom of the groove to provide a substantially fluid-tight contact with the adjacent surfaces of the groove, and the inner legs …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.