Safety valve
US4708163A · kind A · utility
39Cited by
11References
28Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 28, 1987 |
| Grant date | Nov 24, 1987 |
| Priority date | — |
| Expiry date | Jan 28, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/773
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A subsurface safety valve. During normal well flowing conditions, the valve is spring biased to its open position. If the difference in fluid pressure flowing through the valve as compared to fluid pressure exterior to the valve exceeds a preselected value, a pressure sensitive bellows will be actuated to close the valve. A latch mechanism is provided to prevent undesired closure of the safety valve by acceptable pressure transients resulting from normal changes in well operating conditions. An alternative embodiment of the valve responds to an electromagnetic signal from the well surface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.