Sealing ring
US4194749A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 26, 1978 |
| Grant date | Mar 25, 1980 |
| Priority date | — |
| Expiry date | Jul 26, 1998 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16K1/2266
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A double toric sealing ring for providing a seal between a casing and a butterfly member of a butterfly valve is formed with two helical springs each forming a torus and disposed concentrically. The helical spring forming the outer torus has a coil diameter greater than that of the coils of the spring forming the inner torus. Each spring is enclosed by a respective sheath. A metal annulus extending between the tori has its radially inner and outer peripheries bent around the respective sheathed tori. The radially extending portion of the annulus between these bent parts is formed with a bellows like groove concentric with the tori, to permit deformation of the sealing ring which in use is mounted in the butterfly valve so that the smaller diameter encased torus provides a seal between relatively stationary parts and the larger diameter encased torus provides a seal between the casing and the movable butterfly member when the latter is closed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.