Backflow prevention apparatus
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Dec 5, 2000
Grant Date -
N/A
app pub date -
Aug 25, 1999
filing date -
Aug 25, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A dual check valve backflow prevention apparatus of lightweight, compact construction which provides low flow losses and which maintains a small positive pressure differential under static flow conditions via use of a magnetic valve closure mechanism. The apparatus comprises a main valve housing which contains two check valve assemblies. Each check valve assembly has a clapper valve which uses a low friction magnetic pull closure force and drip tight seals in the forward flow direction for maintaining a small positive pressure differential under static conditions. The magnetic bias for the closure force is preferably located in the center of the flow stream. An additional closure force may be provided by a spring or gravity assistance.
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Cited Art Landscape
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