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Backflow Prevention Assembly Flashcards

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  1. A spill-resistant pressure vacuum breaker (SRPVB) differs from a standard PVB primarily because it:

    Answer: Has an enclosure that prevents relief discharge from spilling on the floor

    The SRPVB has an enclosed body that contains any minor relief discharge, making it suitable for indoor installation where a standard PVB's open discharge would be a nuisance.

  2. Which component of an RP assembly ensures that the zone between the two check valves remains at a lower pressure than supply, providing the 'reduced pressure' protection?

    Answer: Relief valve

    The differential relief valve maintains the intermediate zone at a pressure lower than supply pressure; if either check leaks, the zone pressure rises and the relief opens to discharge.

  3. Under ASSE/AWWA standards, backflow prevention assemblies must be tested how often after initial installation?

    Answer: Annually

    Backflow prevention assemblies must be tested annually (at minimum) by a certified tester to verify all mechanical components are functioning within acceptable parameters.

  4. What is the purpose of the bypass valve configuration sometimes used with large-diameter RP assemblies?

    Answer: To allow the assembly to be isolated and tested while maintaining system flow

    A bypass configuration allows water to flow around the assembly being tested or repaired while the primary assembly is isolated, minimizing service disruption.

  5. Which scenario BEST describes a cross-connection?

    Answer: A physical link between the potable supply and a non-potable source

    A cross-connection is any actual or potential physical connection between the potable water supply and any source that could introduce contamination.

  6. When a field tester connects differential pressure gauge hoses to a DCVA, the HIGH side hose connects to:

    Answer: Test cock #1 (upstream of check #1)

    The high side of the differential gauge connects to test cock #1 (upstream supply side) so that supply pressure serves as the reference pressure for measuring check valve differential.

  7. A backflow incident in which the downstream system pressure EXCEEDS the supply pressure, pushing water back into the potable supply, is called:

    Answer: Back-pressure backflow

    Back-pressure backflow occurs when downstream pressure (from booster pumps, thermal expansion, or elevated systems) exceeds supply pressure, reversing flow direction.