Backflow Prevention Assembly Tester Practice Exam Questions

The primary purpose of a backflow prevention assembly is to prevent the reverse flow of water, which can contaminate potable water supplies.

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The two main types of backflow are backpressure and backsiphonage.

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Backpressure occurs when the pressure in the downstream piping system exceeds the pressure in the supply system, potentially causing water to flow backward.

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Backsiphonage is caused by a negative pressure (a vacuum or partial vacuum) in the supply piping, which can draw water backward into the system.

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An RPZ assembly is a type of backflow prevention device that provides the highest level of protection against backflow by using two check valves and a relief valve to maintain a zone of reduced pressure.

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Backflow prevention assemblies should be tested at least annually or as required by local regulations.

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The role of a backflow prevention assembly tester is to inspect, test, and certify that backflow prevention devices are functioning correctly to prevent contamination of potable water supplies.

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The key components of a DCVA are two independently acting check valves, test cocks, and shutoff valves at each end.

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