Apparatus for operating a closure element of a subsurface safety valve and method of using same
US3993136A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 25, 1975 |
| Grant date | Nov 23, 1976 |
| Priority date | — |
| Expiry date | Aug 25, 1995 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/7728
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
Disclosed is a method of utilizing an apparatus for effecting operation of valve closure element in a subsurface safety valve. Preferably, a ball-type closure element is at least partially spaced from sealing engagement with a valve seat for equalizing well pressure about the ball closure element and minimizing frictional resistance of the ball element to operating rotation prior to effecting rotation of the ball element about a pair of substantial fixed ball element support members concentrically engaging the ball element on opposite sides thereof. Rotating cams move a lower seat from the ball element in response to initial reciprocating movement of the valve operator prior to effecting partial spacing and rotating open the ball element.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.