High pressure hose drop backflow/back siphonage preventers
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United States of America Patent
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Jun 4, 2002
Grant Date -
N/A
app pub date -
Aug 7, 2000
filing date -
Aug 5, 1999
priority date (Note) -
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Abstract
A backflow and back-siphonage preventer assembly, consisting of a ball valve and a double check valve backflow preventer with an atmospheric vent, provides isolation protection on high pressure plumbing supply lines, such as high pressure hose drops used for the washdown of equipment and facilities, e.g. in food processing plants. The backflow preventer includes a housing with an inlet, an outlet, and a drain outlet therebetween. A first valve is upstream of the drain outlet passage, and a second valve is downstream of the drain outlet, a sealing member moves between a first position in which the drain outlet passage is closed, and a second position in which the drain outlet passage is open. A reinforcing member operatively coupled to the sealing member permits operating pressures of greater than about 500 psi without blow-out of the sealing member.
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