Subsurface well safety valve
US4503913A · kind A · utility
18Cited by
11References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 18, 1983 |
| Grant date | Mar 12, 1985 |
| Priority date | — |
| Expiry date | Jul 18, 2003 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B2200/05
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A subsurface control fluid pressure actuated well safety valve employs one or more spindles attached to the valve housing and spindle sleeves attached to a shiftable actuating flow tube. The spindles and spindle sleeves are positioned between the valve housing and the flow tube and a change in the pressure force acting on the spindle and on the spindle sleeve will result in relative movement of the spindle sleeve with respect to the spindle to cause the flow tube actuator to shift and open a fluid transmission conduit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.