Plug valve with hydraulically actuated seals
US4497467A · kind A · utility
5Cited by
14References
8Claims
0Family size
Inventors
Key dates
| Filing date | Sep 15, 1982 |
| Grant date | Feb 5, 1985 |
| Priority date | — |
| Expiry date | Sep 15, 2002 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/86043
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A rotary plug valve has hydraulically actuated seals for sealing between a valve body and a rotatable valve plug. The valve plug is rotated to open or close the valve. A valve handle for turning the plug can be rotatably uncoupled from the valve plug when the valve is closed and turned relative to the plug toward an overtravel position to actuate a hydraulic piston to pressurize the seals. A second piston regulates pressure to the seals and prevents overpressurization.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.