Flow control method
US4553594A · kind A · utility
2Cited by
13References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 8, 1983 |
| Grant date | Nov 19, 1985 |
| Priority date | — |
| Expiry date | Apr 8, 2003 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S507/936
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
Apparatus, and method, for controlling the flow of dilute solutions of polymers such as dilute aqueous solutions of partially hydrolyzed polyacrylamides without causing any significant degradation of the polymer comprising the solutions. In one embodiment, the apparatus comprises a needle valve positioned in a conduit for transporting polymer solutions, and across which a fluid pressure differential exists. In another embodiment, the apparatus comprises a self-adjusting flow regulator which incorporates a tapered, or pointed, throttle carried on a reciprocatable piston.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.