Valves
US4768594A · kind A · utility
23Cited by
14References
66Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 24, 1986 |
| Grant date | Sep 6, 1988 |
| Priority date | — |
| Expiry date | Oct 24, 2006 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B2200/05
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
There are disclosed two embodiments of a valve for closing a well conduit within a wall bore to flow therethrough automatically in response to the loss of a controlled condition. Each embodiment of the valve has means in which energy may be generated, in response to bleeding off of pressure above the closed valve. So long as the controlled condition is maintained, the return of a pressure balance across the closed valve will permit the release of generated energy to open the valve. The loss of the controlled condition releases further generated energy to close the valve.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.