Selector relief valve assembly
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United States of America Patent
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-
Oct 31, 1995
Grant Date -
N/A
app pub date -
Nov 7, 1994
filing date -
Nov 7, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A dual pressure relief valve selector is formed by a Y-shaped tubular body having an inlet port at its stem position connected with a vessel or a line to be monitored. Each leg of the Y-shaped housing is connected in fluid communicating relation with a safety relief valve. A spring and fluid flow biased open flap valve and valve seat is contained by each leg of the Y-shape adjacent the inlet of the respective relief valve. A pinion journalled by the housing moves a rack to and fro between the flap valves for normally maintaining one of the flap valves in closed position and isolating the relief valve downstream from the closed flap valve.
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