Flapper operating system without a flow tube
US9163479B2 · kind B2 · utility
15Cited by
37References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 3, 2007 |
| Grant date | Oct 20, 2015 |
| Priority date | — |
| Expiry date | Mar 30, 2034 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B2200/05
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A subsurface safety valve features no flow tube to operate the flapper and optionally an equalizing valve in the flapper, if used. It relies on magnetic force that is selectively created to draw the flapper to the open position. A torsion spring can close the valve when the field is removed. Optionally, the fields can be set up to pull and push the flapper open or to do either one. The optional equalizer valve can also be operated by a force field, preferably magnetic.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.