High and low tubing pressure actuated well safety valve
US4161960A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 23, 1978 |
| Grant date | Jul 24, 1979 |
| Priority date | — |
| Expiry date | Feb 23, 1998 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/7733
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A well safety valve adapted to be positioned in a well tubing and close on either a predetermined high tubing pressure or a predetermined low tubing pressure. The valve closure member in the valve body moves between an open and closed position in response to longitudinal movement of a tubular member. The tubular member has an open bore for alignment with the bore of the well tubing to provide straight through flow through the safety valve. In addition, the tubular member has a plurality of telescoping sections and releasable and resettable locking means normally securing the plurality of sections together. A predetermined high tubing pressure or a predetermined low tubing pressure acting on the tubular member causes the valve to close.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.