Backflow preventing device

Details Backflow preventing device Backflow preventing device

F - Mech Eng,Light,Heat,Weapons

16

K

137/16

F16K 24/02 (2006.01) E03C 1/10 (2006.01) F16K 15/02 (2006.01) F16K 17/19 (2006.01)

Patent

CA 1279550

BACKFLOW PREVENTING DEVICE Abstract of the Disclosure A hose connection vacuum breaker backflow preventing device for installation on the discharge nozzle of a water faucet for preventing reverse water flow into the faucet which may possibly contaminate the water supply. The device includes a unitary tubular body defining an unobstructed passageway with threaded female inlet and male outlet connections at opposite ends thereof. An integral shoulder is formed interiorly of the passageway and a pair of exhaust ports open radially I outwardly through the body from the passageway upstream of the shoulder. A valve assembly within the passageway is spring-biased into a seated position closing communication between the inlet and outlet ends of the passageway while permitting fluid communication between the outlet end and the ports for draining any reverse water flow. The valve assembly is yieldable to an operating position under the force of pressurized fluid flow into the inlet passageway end to open communication with the outlet passageway end, while a resilient valve washer contacts the interior shoulder to close communication between the passageway and the ports to prevent water leakage.

529331

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