Vacuum actuated sheath valve
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United States of America Patent
Stats
-
Aug 5, 1997
Grant Date -
N/A
app pub date -
Mar 6, 1995
filing date -
Mar 6, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
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 flows through the valve when it is drawn by a vacuum. The vacuum operates on both the flow path exit, but also above the membrane, lifting it to open the flow path. Discontinuance of the vacuum allows the membrane to seal the inlet and outlet, thus again preventing any flow between them.
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