Backflow prevention apparatus

Details Backflow prevention apparatus Backflow prevention apparatus

E - Fixed Constructions

03

B

137/16

E03B 7/07 (2006.01)

Patent

CA 1090675

ABSTRACT OF THE DISCLOSURE Two identical check valves assemblies are connected in series with a zone between them. A differential control valve vents this zone to atmos- phere 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.

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