Butterfly valves and construction thereof
US7758017B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 22, 2007 |
| Grant date | Jul 20, 2010 |
| Priority date | — |
| Expiry date | Aug 23, 2028 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16K1/2265
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
Various exemplary embodiments of a butterfly-type valve that provide a reduction in the unseating torque are disclosed that include a valve body defining a flow passage therein, and a closure disc disposed in the flow passage that has an axis of rotation about which the closure disc rotates between open and closed positions. The valve includes a cylindrical body liner disposed within the valve, which includes a circumferential sealing surface that is engaged by the closure disc to establish a seal when the closure disc is rotated to a closed position. At least one resilient band is at least partially interposed between the valve body and the cylindrical body liner, and at least a portion of the resilient band is tapered to a reduced thickness. The taper reduces the forces associated with the engagement by the closure disc, to thereby reduce the unseating torque required to open the closure disc.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.