Backflow preventer and relief valve assembly

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

1976-07-19

1978-05-23

Cohan, Alan

Fluid handling

Back flow prevention by vacuum breaking

137218, E03B 707

Patent

active

040905276

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: 3173439 (1965-03-01), Griswold et al.
patent: 3837358 (1974-09-01), Zieg et al.

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