Self supporting plug for a double block and bleed plug valve
US5011115A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 29, 1989 |
| Grant date | Apr 30, 1991 |
| Priority date | — |
| Expiry date | Dec 29, 2009 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16K5/185
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
Self supporting, non-lubricated retractable seal double block and bleed plug valve wherein an improved plug configuration provides direct bearing surface support for the plug along at least a portion of the radial surface of the plug. The remaining radial surface of the plug may be optionally relieved to avoid scuffing the swept seating area of the interior valve body surface. By utilizing the novel plug configuration for direct plug bearing support, the present invention obviates the need for a lower trunnion and does away with the need for high load-bearing bushings. In all other respects, the operation of a plug valve, utilizing the plug of the present invention, remains substantially the same as it would be for a prior art plug valve. In fact, it is possible to substitute a novel plug configuration of the present invention for a prior art plug configuration for retrofitting existing valves of the type herein disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.