Subsurface tubing safety valve
US5263847A · kind A · utility
24Cited by
9References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 1, 1992 |
| Grant date | Nov 23, 1993 |
| Priority date | — |
| Expiry date | May 1, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/7868
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
There is disclosed a subsurface tubing safety valve of the type having a flapper swingable between an open position to one side of its bore and a closed position over a seat about its bore. A seal ring retained in a groove about the seat has a protruding lip which is initially engaged by the flapper as it is swung toward the seating surface of the seat.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.