Subsurface safety valve
US4448216A · kind A · utility
49Cited by
3References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 15, 1982 |
| Grant date | May 15, 1984 |
| Priority date | — |
| Expiry date | Mar 15, 2002 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/86944
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A surface controlled subsurface safety valve having a ball type valve closure. The ball member and its associated components are protected from damage by preventing excessive control fluid pressure from applying force to the ball member. Also, rotation of the ball member is prevented until any difference in pressure across the ball member and its seating surface has decreased below a preselected safe value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.