Self-draining backflow prevention valve

Details Self-draining backflow prevention valve Self-draining backflow prevention valve

1989-11-20

1990-12-11

Hepperle, Stephen M.

Fluid handling

Self-proportioning or correlating systems

Supply and exhaust type

137218, 1375123, E03C 110

Patent

active

049762796

ABSTRACT:
The present invention comprises an automatic self-draining backflow prevention valve having an internal cylindrical resilient sleeve that expands or contracts in response to water pressure to coact with a two way valve that provides for automatic self-draining of both the water faucet and the backflow prevention valve when the water faucet is shut off.

REFERENCES:
patent: 2646063 (1953-07-01), Hayes
patent: 2997054 (1961-08-01), Woodford
patent: 3023767 (1962-03-01), Woodford
patent: 3155107 (1964-11-01), Woodford
patent: 3171423 (1965-03-01), Dillon
patent: 3183924 (1965-05-01), Duchin
patent: 3868962 (1975-03-01), Waterston
patent: 4658852 (1987-04-01), Weingarten
patent: 4726390 (1988-02-01), Franklin

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