Backflow prevention apparatus
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Sep 3, 2002
Grant Date -
N/A
app pub date -
Dec 28, 2000
filing date -
Dec 28, 2000
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A check valve apparatus, usable in a double check valve backflow preventer apparatus, comprising a valve seat, a clapper pivotally coupled to the valve seat, a seal positioned to sealingly engage the clapper and valve seat when the clapper is closed against the seat, and a closure mechanism. The closure mechanism includes a first linkage element pivotally associated with the valve seat at a first pivot point located upstream from the seal, a second linkage element which is pivotally coupled to the first linkage element at a second pivot point, and which is pivotally associated with the clapper at a third pivot point, and a bias element associated with at least one of the linkage elements and configured to exert a closure force on the clapper.
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