Butterfly valves
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Jun 6, 1989
Issued Date -
N/A
app pub date -
Aug 9, 1988
filing date -
Sep 14, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The present invention comprises a transport system having an annular inflatable seal which has an annular interior domed portion which expands as an integral unit until it contacts the edge of a butterfly valve which engages the domed portion to form a slight recess in the annular seal which provides an airtight and locking seal with the annular seal having a pair of annular resilient legs operable to return the annular interior domed portion to its original position to permit the butterfly valve to be opened.
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Cited Art Landscape
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