Dual seat valve
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United States of America Patent
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-
Sep 28, 2004
Grant Date -
N/A
app pub date -
Jan 24, 2003
filing date -
Jan 24, 2003
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A dual seat valve which selectively supplies and releases fluid to and from a reservoir, such as a dome of a main valve in a pressure relief system. The valve comprises a housing with an interior chamber and an annular first seat surface. A valve assembly is configured for sliding movement within the housing, the valve assembly comprising a hollow stem with a distal end having an annular second seat surface. A sealing member such as a spherical ball is disposed within the interior chamber. In a first valve position, the second seat surface extends through and above the first seat surface, supporting the sealing member and permitting fluidic flow through the first seat surface. In a second valve position, the second seat surface retracts and the sealing member is supported on the first seat surface, permitting fluidic flow through the second seat surface.
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