Backflow prevention apparatus

Details Backflow prevention apparatus Backflow prevention apparatus

1980-09-02

1982-12-21

Michalsky, Gerald A.

Fluid handling

Self-proportioning or correlating systems

Supply and exhaust type

137218, 251282, E03C 110

Patent

active

043644082

ABSTRACT:
Two identical check valve 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: 2503424 (1950-04-01), Snyder
patent: 3283772 (1966-11-01), Ensign
patent: 3448763 (1969-06-01), Curtiss
patent: 3724487 (1973-04-01), Hunter
patent: 3837358 (1974-09-01), Zieg et al.

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