BACKFLOW PREVENTION ASSEMBLY TESTING MANUAL

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BACKFLOW PREVENTION ASSEMBLYTESTING MANUALLos Angeles County Department of Public HealthEnvironmental ProtectionCross-Connection and Water Pollution Control ProgramTABLE OF CONTENTSTESTING TECHNIQUES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . 1-2CONCEPTS OF BACKFLOW PREVENTIONASSEMBLY TESTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . 3-4SINGLE CHECK TYPE PRESSURE VACUUM BREAKERTUBE TEST PROCEDUREAir Inlet Opening Point.

Backflow Prevention Assembly Testing Manual Concept 4 check valve to atmospheric and observing the upstream pressure at which the check valve closes. Minimum acceptable value: 1.0 psi. Note: Accurate gauge readings of check valves are dependent on a solid downstream reference point. If the downstream test cock is at the highest point

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