Sheath valve
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Mar 25, 1997
Issued Date -
N/A
app pub date -
Oct 24, 1994
filing date -
Oct 24, 1994
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 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.
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