Gate valve for shearing workover lines to permit shutting in of a well
US4215749A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 5, 1979 |
| Grant date | Aug 5, 1980 |
| Priority date | — |
| Expiry date | Feb 5, 1999 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/1647
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A gate valve which is mounted on a wellhead assembly and which may be closed to shear off workover lines, macaroni tubing and other suspension members so as to quickly shut in a well under emergency conditions. The gate has a flow port which aligns with the flow passage of the valve when the gate is open. A cutting edge of the port cooperates with a corner area of the downstream valve seat to shear the suspension member when the gate is forcefully closed by a hydraulic actuator mechanism. An undercut open space is presented immediately below the cutting edge to accommodate the sheared suspension member without jamming the gate or otherwise hampering its closure function.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.