Plug valve
US4130129A · kind A · utility
Inventor
Key dates
| Filing date | Nov 21, 1977 |
| Grant date | Dec 19, 1978 |
| Priority date | — |
| Expiry date | Nov 21, 1997 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/7256
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A plug valve, especially for use in lines carrying abrasive materials and materials at high temperatures and pressures. The valve body is rotatable in a valve casing having inlet and outlet ducts to bring a port in the valve body into communication with the inlet and outlet ducts. Recesses are provided in the valve body wall for closely fitted sealing plugs. The outer faces of these plugs conform to the wall of the valve body. A fluid reservoir within the valve body is connected to the recesses by passageways. A moveable piston is provided in the reservoir to force hydraulic fluid under controllable pressure into the spaces between the rear wall of the recesses and the sealing plugs, thereby permitting the sealing plugs to be maintained in fluid-tight contact with the inner wall of the casing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.