Reclosing collapsible pin pressure relief valve
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United States of America Patent
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-
Mar 17, 1998
Grant Date -
N/A
app pub date -
Dec 13, 1996
filing date -
Dec 13, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A fluid pressure relief valve of the excess pressure collapsible pin relief valve type which monitors fluid pressure in a system and automatically recloses after opening and discharging an initial volume of high pressure fluid. The relief valve includes a valve body connected with a fluid system being monitored with a valve head closing an inlet port and having a valve stem projecting axially beyond the valve head through the valve body and maintained closed by a pin cage having a collapsible pin axially abutting the outward end of the valve stem. A cylinder surrounds the valve stem between the valve body and the pin cage with a piston connected with the valve stem at the cylinder end opposite the valve head. A proximity switch responsive to outward movement of the valve stem upon collapse of the pin energizes a circuit opening a valve connecting a source of pressurized gas with the piston end of the cylinder to force the valve head toward end of the seat and close the relief valve.
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