F - Mech Eng,Light,Heat,Weapons – 16 – K
Patent
F - Mech Eng,Light,Heat,Weapons
16
K
137/16
F16K 24/00 (2006.01) E03C 1/10 (2006.01)
Patent
CA 1273263
ABSTRACT A self-draining hose connection vacuum breaker and backflow preventer having a flexible annular dia- phragm and a coacting seat disc movable relative thereto which, together, function to prevent backflow through the device and with the annular diaphragm coacting with atmospheric vents to provide a vacuum break and fluid drain, A movable piston has two different positions, dependent upon whether or not a hose is connected to the device, with the piston mounting the seat disc for move- ment therewith and relative thereto whereby the seat disc and annular diaphragm coact to prevent backflow when a hose is attached to the device, but the seat disc is postponed to permit flow through a central opening of the annular diaphragm when a hose is removed from the device to prevent trapped water in a source valve, such as a faucet or the like, which could result in either pipe and/or valve rupture resulting from freezing or retention of stagnant water which could result in bacterial growth.
548179
Holliday Richard J.
Lair John E.
Luckenbill Lawrence F.
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