Sheath valve
US5613517A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 24, 1994 |
| Grant date | Mar 25, 1997 |
| Priority date | — |
| Expiry date | Oct 24, 2014 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/7843
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A linear sheath valve having a valve platform and a conforming cover. The valve platform can have inlet and outlet channels to carry liquid into and out of the valve. An elastomeric membrane is held under tension between the cover and the valve platform so as to control the flow of liquid between channels. The cover includes an expansion area on the cover surface adjacent to the membrane and between the inlet and outlet. Liquid can flow through the valve only when it is under sufficient pressure to press the membrane into the expansion area, creating a flow path from the inlet between the membrane and the valve platform and to the outlet. Discontinuance of the pressure on the liquid allows the membrane to seal the inlet and outlet, thus preventing any flow between them.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.