Annular piston valve
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United States of America Patent
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-
Nov 22, 1983
Grant Date -
N/A
app pub date -
Jun 22, 1981
filing date -
Jun 22, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A valve construction wherein a streamlined flow diverter is centered within a cylindrical valve body. A slidable annular seat ring is biased upstream to seal against a seating surface on the inwardly tapered downstream side of the flow diverter and is biased by fluid pressure so that the valve opens when line pressure exceeds the control pressure. The inner contour of the retractable seat ring and the tapered outer contour of the downstream side of the flow diverter are such that the minimum flow area between them occurs a short distance downstream of the seating surface and is thereafter maintained or slightly increased gradually to an abrupt termination of the tapered surface.
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