Well safety valve
US4376464A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 8, 1980 |
| Grant date | Mar 15, 1983 |
| Priority date | — |
| Expiry date | Dec 8, 2000 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B2200/05
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A well safety valve, connectable in a tubing string for controlling fluid flow therethrough, in which the valve closure means is operated by a longitudinally movable, telescoping tubular operating member. High differential pressure across the closed valve closure means causes the tubular operator to telescope preventing damage to the closure means. The telescoping tubular operator extends automatically upon release of the high differential pressure. A piston rod type equalizing valve is provided which is engageable with the tubular operator in order to reduce pressure differential across the closure means prior to closure member opening forces being applied to the closure member by the tubular operator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.