Gas shut-off valve
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United States of America Patent
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-
Sep 4, 1984
Grant Date -
N/A
app pub date -
Jan 18, 1982
filing date -
Jan 18, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A shut-off valve includes a valve stem or actuating member operatively connected to a pressure-responsive apparatus. The pressure-responsive apparatus is acted upon by fluid in a pressure chamber such that the valve mechanism is held open to permit fluid flow therethrough. A spring or biasing means is provided that automatically closes the valve mechanism whenever the pressure chamber is evacuated or depressurized such that the pressure-responsive apparatus can no longer maintain the shut-off valve in an open position.
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