Backflow Prevention Practice Exam

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When testing a backflow preventer, shut-off valve 2 is closed before shut-off valve 1 because _____?

Failures in outlet valves are determined first
The potential of backflow during the test is eliminated
Water pressure will be maintained for testing
It slows the rate of flow through the assembly

The correct answer is: Water pressure will be maintained for testing

The reasoning behind closing shut-off valve 2 before shut-off valve 1 when testing a backflow preventer is fundamental to ensuring accurate and effective testing conditions. When shut-off valve 2 is closed first, it helps to maintain water pressure within the testing assembly. This pressure stability is crucial because it allows for a controlled test environment, ensuring that the pressure levels are appropriate for assessing the performance of the backflow preventer. Maintaining proper water pressure during testing is vital for evaluating whether the preventer is functioning correctly, as any fluctuations or dips could lead to misleading results. By closing the valves in this order, the tester can create a situation where all potential factors affecting pressure dynamics are managed effectively, leading to more reliable data on the functioning of the backflow preventer.