Safety valve
US4664195A · kind A · utility
14Cited by
8References
13Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 31, 1986 |
| Grant date | May 12, 1987 |
| Priority date | — |
| Expiry date | Jan 31, 2006 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/7781
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A direct acting subsurface safety valve. During normal well flowing conditions, an operator sleeve is spring biased to hold the valve closure mechanism in its open position. If the rate of change of fluid pressure flowing through the valve exceeds a preselected value, a pressure sensitive piston will shift the operator sleeve 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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.