Flow control apparatus and method
US4510993A · kind A · utility
19Cited by
5References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 25, 1982 |
| Grant date | Apr 16, 1985 |
| Priority date | — |
| Expiry date | Mar 25, 2002 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/7792
- 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.