Shut off apparatus for a fluid passage, method for controlling the same, and method for confirming closing of the same
US5101848A · kind A · utility
24Cited by
2References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 11, 1991 |
| Grant date | Apr 7, 1992 |
| Priority date | — |
| Expiry date | Mar 11, 2011 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/2196
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
Method of opening and closing a fluid passage comprises the steps of freezing fluid in the fluid passage by first cooling the fluid to a temperature below the freezing point of the fluid to close the fluid passage and after the fluid passage is closed, raising the temperature of the fluid close (or just below) to the freezing point of the fluid, whereby the fluid passage is maintained in a closed state with a small power supply and the responsiveness in opening the fluid passage is enhanced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.