Adjustable safety valve
US4446922A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 16, 1982 |
| Grant date | May 8, 1984 |
| Priority date | — |
| Expiry date | Jun 16, 2002 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B2200/04
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A ball type safety valve mounted in a movable cage for automatically closing a subterranean well conduit is disclosed. The ball has a central flow passage which can be aligned with the tubing to permit production and can be automatically rotated to block the tubing. The ball is moved from its closed to its open position by an increase in control fluid pressure, preferably in an external control fluid line extending to the surface of the well. An increase in control fluid pressure causes the cage to move axially and rotation is imparted by the offset camming means attached to a stationary base member. The base member is adjustable relative to the valve housing and to the cage to insure that the valve is fully open and fully closed at opposite extremes of the travel of the cage and ball assembly.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.