Equalizing flapper for down hole safety valves
US6644408B2 · kind B2 · utility
11Cited by
8References
20Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 5, 2001 |
| Grant date | Nov 11, 2003 |
| Priority date | — |
| Expiry date | Jan 15, 2022 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B2200/05
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
An equalizer valve for a flapper in a subsurface safety valve is described. A tapered plunger is biased by compact spring disposed in the plunger bore. The spring is supported by a C-shaped ring extending into a peripheral groove around the plunger bore.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.