Valve operable under oppositely directed pressure differentials
US4421171A · kind A · utility
12Cited by
7References
17Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 21, 1981 |
| Grant date | Dec 20, 1983 |
| Priority date | — |
| Expiry date | May 21, 2001 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B2200/04
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A valve is provided for use in a subterranean well. Rotary manipulation of a fluid transmission conduit results in rotation of a ball valve to selectively open and close the fluid conduit. Rotary manipulation of the fluid conduit is imparted to the ball valve by means of a lever assembly which transfers sufficient force for activation of the valve permitting the valve to be used in the presence of significant pressure differentials. Seals are provided on opposite sides of the ball valve to prevent communication of either fluid or pressure from either above or below the ball valve.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.