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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 . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . 5-6Check Valve Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . 7TWO CHECK TYPE pressure TYPE VACUUM BREAKERTUBE TEST PROCEDUREAir Inlet Operation.

Reduced Pressure Principle Backflow Preventers shall be tested by utilizing an acceptable differential pressure gauge. ... Backflow Prevention Assembly Testing Manual Concept 4 check valve to atmospheric and observing the upstream pressure at which the …

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