Backflow preventer and relief valve assembly

Details Backflow preventer and relief valve assembly Backflow preventer and relief valve assembly

1976-07-19

1977-08-30

Cohan, Alan

Fluid handling

Self-proportioning or correlating systems

Supply and exhaust type

137215, 137494, 251 614, E03B 707

Patent

active

040447871

ABSTRACT:
A backflow prevention assembly designed for connection between a main supply line and a service pipe in water supply service, comprising two check valves in series and a relief valve for draining the chamber between the two check valves under certain operating conditions.

REFERENCES:
patent: 2491604 (1949-12-01), Carlton et al.
patent: 3173439 (1965-03-01), Griswold et al.
patent: 3321173 (1967-05-01), Seger
patent: 3837358 (1974-09-01), Zieg et al.

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