Backflow preventer

Details Backflow preventer Backflow preventer

F - Mech Eng,Light,Heat,Weapons

16

K

137/135

F16K 24/00 (2006.01) E03C 1/10 (2006.01)

Patent

CA 1116976

Abstract of the Disclosure 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.

327139

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