Backflow preventer
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Dec 30, 1980
Grant Date -
N/A
app pub date -
May 30, 1978
filing date -
May 30, 1978
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A backflow preventer comprising a body defining a passage for flow of liquid between a supply pipe and a service pipe, a check valve in the body passage, and a relief valve assembly connected to the body passage downstream of the check valve, the assembly comprising a liquid drainage passage connected to a first port in the body passage, a first valve in the drainage passage, a gas intake passage connected to a second port above the first port in the body passage, and a second valve in the intake passage.
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