Shut-off valve for evacuation and fill without energizing valve
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United States of America Patent
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-
Sep 16, 1997
Grant Date -
N/A
app pub date -
Dec 5, 1995
filing date -
Dec 5, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A shut-off valve used in a fluid transmission line for the evacuation and fill of a fluid without the need for first energizing the valve to keep the valve in an open position by using a collar on the shaft of said valve which dissolves or disintegrates automatically upon contact with the fluid for a predetermined length of time such that the valve returns to its normal control functions.
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