Backflow prevention apparatus

Details Backflow prevention apparatus Backflow prevention apparatus

1979-02-09

1981-01-13

Michalsky, Gerald A.

Fluid handling

Back flow prevention by vacuum breaking

Air vent in liquid flow line

137107, 1374842, 137512, 137540, 1376142, F16K 2400, F16K 1502

Patent

active

042443920

ABSTRACT:
Two identical check valves assemblies are connected in series with a zone between them. A differential control valve vents this zone to atmosphere whenever the downstream pressure approaches the upstream pressure within a predetermined magnitude. The action of the differential control valve is responsive to differential pressure across the upstream check valve.

REFERENCES:
patent: 3027913 (1962-04-01), Chatham et al.
patent: 3173439 (1965-03-01), Griswold et al.
patent: 3438391 (1969-04-01), Yocum
patent: 3837358 (1974-09-01), Zieg et al.

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