Actuatable safety valve for wells and flowlines
US4331315A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 24, 1978 |
| Grant date | May 25, 1982 |
| Priority date | — |
| Expiry date | Nov 24, 1998 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B2200/04
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An actuatable safety valve for the production tubing of wells and/or fluid flowlines includes a valve element having both linear and rotary components of movement within a valve body and is actuated by a lost-motion rack and pinion gear actuating mechanism. The clam-shell pinion gear is moved linearly within the valve body by a hydraulic sleeve piston actuator for causing control valve movement responsive to hydraulic control of the sleeve piston. The sleeve piston is also responsive to upstream pressure for pressure actuation of the valve to its closed position. The valve element is also mechanically movable to its closed position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.