Pressure operated safety valve with lock means
US4550780A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 30, 1981 |
| Grant date | Nov 5, 1985 |
| Priority date | — |
| Expiry date | Apr 30, 2001 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B2200/04
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A pressure operated safety valve adapted to be mounted in a well tubing for normally being movable to an open position by control fluid supplied from the surface, and which valve is automatically closed when the well pressure reaches a predetermined amount, whereby blowouts of the well are automatically prevented. The valve has locking means therewith which is operable by fluid pressure supplied through the well tubing from the surface for locking the valve open in the event the valve is malfunctioning in its normal operation and a "Storm" choke or other type of safety valve is to be added in the well tubing, or it is desired to temporarily or permanently lock the valve open for any other purpose. Means are also provided for releasing the locking means to return the valve to its normal operating condition if desired.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.