Piston actuated chemical injection valve
US4562854A · kind A · utility
10Cited by
5References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 27, 1984 |
| Grant date | Jan 7, 1986 |
| Priority date | — |
| Expiry date | Sep 27, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/2934
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An injection valve for injecting chemicals into a well which is actuated by a piston having an upwardly and a downwardly directed metal cup seal with a resilient seal therebetween and a gas pressure charge above the piston acting to close the injection valve. Oil may be provided in the body between the gas charge and the piston for acting as a barrier. The gas charge may be placed in a closed gas container having a rupturable portion with a piercing means for opening the container. The container may include oil.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.