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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . 8-9Check Valve Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . 10-11DOUBLE CHECK VALVE ASSEMBLIESTUBE TEST PROCEDURECheck Valve Operation.

for all backflow prevention assembly testing. Further, field testing of check valves in the direction of flow is the selected technique since it is in conformance with design specifications and laboratory field testing.

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