Butterfly valve
US6758458B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 1, 2003 |
| Grant date | Jul 6, 2004 |
| Priority date | — |
| Expiry date | Jul 1, 2023 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16K1/2265
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
Provided is a butterfly valve that prevents occurrence of erosion, thereby rendering it possible to secure fine adjustment of a volumetric flow rate of a fluid in an area of low degree of valve opening or in an area of minute degree of valve opening, to infallibly attain high range ability. This invention provides a butterfly valve for opening and shutting an interior of an elastic seat ring 2 mounted in a cylindrical valve casing 1 by rotation of a disc valve member 3, wherein the butterfly valve comprises depressing valve parts 10 and 11 provided at least on an orifice side 8 of the valve member 3 and adapted to make depressing contact with the elastic seat ring 2 in the area of low degree of opening or in the area of minute degree of opening of the valve member 3, a void part 12 formed along an outer peripheral edge of the valve member 3 or at a downstream side position of the outer peripheral edge, and communicating parts 13 formed in the valve member 3 or the depressing valve parts 10 and 11 to establish communication from the void part 12 toward a downstream side.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.