Enhanced backflow prevention apparatus and method
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United States of America Patent
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-
Sep 21, 2004
Grant Date -
N/A
app pub date -
Dec 2, 2002
filing date -
Dec 2, 2002
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A backflow prevention apparatus and method are provided for use in irrigation systems. An anti-siphoning device may have a housing, a plunger, a plunger retainer, and a cap. The housing has inlet and outlet channels formed therein, with the outlet channel running through the interior of the inlet channel. The plunger has a generally annular shape and is disposed to block water flow from the outlet channel into the inlet channel, but to allow flow from the inlet channel to the outlet channel. When the inlet channel is closed, the plunger permits air to flow into the outlet through the cap, the plunger retainer, and a central opening formed in the plunger. The plunger may have an elastomeric exterior to provide a more effective seal between the plunger and the inlet channel.
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