Fluid injection valve for wells
US3993129A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 26, 1975 |
| Grant date | Nov 23, 1976 |
| Priority date | — |
| Expiry date | Sep 26, 1995 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/2934
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A fluid injection valve for use in a well tubing having an opening therein in which the valve controls the flow of fluid flowing between the outside of the tubing and the inside of the tubing through the opening. A spring-loaded relief valve element yieldably closes a port in the valve against the flow of fluid and a closed flexible pressurized chamber is provided with one end being movably positioned against the valve element. The exterior of the chamber is exposed to the valve outlet pressure so that in the event that the outlet pressure drops below a predetermined amount, the chamber will expand and act against the valve element to close the valve. The chamber may be a bellows and the cross-sectional area of the chamber is preferably greater than the cross-sectional area of the port to provide a closure force sufficient to overcome a hydrostatic head outside of the tubing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.