Subsea control valve apparatus
US3967647A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 22, 1974 |
| Grant date | Jul 6, 1976 |
| Priority date | — |
| Expiry date | Apr 22, 1994 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/87981
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A control valve apparatus adapted to be positioned within a subsea blowout preventer stack for controlling the flow of fluid from an offshore well includes a control unit releasably latched to a valve body having tandem, normally closed valve assemblies, the upper valve assembly including a flapper valve element and the lower valve assembly including a ball valve element. The control unit has hydraulically operable mechanisms adapted to open the valve elements in response to pressurization of control lines extending upwardly to the surface, and to assist in closure of the ball valve element to effect cutting of wireline or cable extending into the well in case of emergency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.