Valve and position control using magnetorheological fluids
US7428922B2 · kind B2 · utility
75Cited by
28References
27Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 1, 2002 |
| Grant date | Sep 30, 2008 |
| Priority date | — |
| Expiry date | Jun 9, 2023 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF15B21/065
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Magnetorheological fluids, which solidify in response to a magnetic field, offer the ability to simplify many of the valves and control systems used downhole in the search for and production of oil and gas. They lessen the need for moving parts, provide solid-state valves, and can provide a differential movement of fluid through the valves by varying the strength of the magnetic field. Combinations of permanent and electro-magnets can improve safety by providing valves that fail, when power is lost, in either an open or closed position, depending on design. A number of examples are given.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.