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BACKFLOW PREVENTION ASSEMBLY TESTING MANUAL

BACKFLOW PREVENTION ASSEMBLYTESTING MANUALLos Angeles County Department of Public HealthEnvironmental ProtectionCross-Connection and Water Pollution Control ProgramTABLE OF CONTENTSTESTING TECHNIQUES .. 1-2 CONCEPTS OF BACKFLOW PREVENTIONASSEMBLY TESTING .. 3-4 SINGLE CHECK TYPE pressure VACUUM BREAKERTUBE TEST PROCEDUREAir Inlet Opening Point .. 5-6 Check Valve Operation .. 7 TWO CHECK TYPE pressure TYPE VACUUM BREAKERTUBE TEST PROCEDUREAir Inlet Operation .. 8-9 Check Valve Operation .. 10-11 DOUBLE CHECK VALVE ASSEMBLIESTUBE TEST PROCEDUREC heck Valve Operation .. 12-13 SINGLE CHECK pressure TYPE VACUUM BREAKERGAUGE TEST PROCEDUREAir Inlet Operation .. 14-15 Check Valve Operation .. 16 SPILL-RESISTANT pressure VACUUM BREAKERGAUGE TEST PROCEDUREAir Inlet Opening Point.

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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