Relief valve assembly for use with backflow preventers

Details Relief valve assembly for use with backflow preventers Relief valve assembly for use with backflow preventers

1982-05-28

1985-03-26

Michalsky, Gerald A.

Fluid handling

Back flow prevention by vacuum breaking

Air vent in liquid flow line

137107, 251357, F16K 2400

Patent

active

045066949

ABSTRACT:
A relief valve assembly for use in backflow preventers having at least one check valve, the relief valve assembly being operable in response to changes in differential pressure across the check valve and in fluid connection downstream of the check valve for discharging liquid therefrom to atmosphere when a backflow condition occurs. The at least one check valve prevents backflow from a service pipe to the supply pipe but when the at least one check valve is fouled, and a backflow condition occurs, the relief valve assembly operates to permit the discharge of the liquid from the service line and prevent contamination of the supply line.

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