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Backflow Prevention Assembly Flashcards

7 cards from real ABC practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Backflow Prevention Assembly flashcards as text

  1. A reduced pressure principle assembly must be installed with a minimum clearance above grade or the floor to allow for:

    Answer: Observation, testing, and drainage of the relief valve discharge

    Minimum clearance is required so the relief valve can discharge freely and testers can observe, service, and test the assembly without obstruction.

  2. Which test cock on a double check valve assembly is used to introduce test equipment pressure to the space between the two check valves?

    Answer: Test cock #3

    Test cock #3 is located between the two check valves on a DCVA and is used to introduce or bleed pressure in the interspace during differential pressure testing.

  3. What is the minimum upstream supply pressure typically required for a pressure vacuum breaker to operate correctly?

    Answer: 5 psi

    A PVB requires a minimum of 5 psi supply pressure above the critical level (highest downstream outlet) to maintain the check valve in the closed position.

  4. Why is a pressure vacuum breaker (PVB) NOT acceptable for use against back-pressure conditions?

    Answer: Back-pressure can force the check valve open, defeating protection

    A PVB is designed only for backsiphonage protection; back-pressure from downstream can overcome the check valve spring and force the check open, allowing backflow.

  5. Which of the following installation conditions would DISQUALIFY a pressure vacuum breaker?

    Answer: Installed below the highest downstream outlet

    A PVB must be installed at least 12 inches ABOVE the highest downstream outlet; installation below the highest outlet allows back-pressure to develop, defeating the device.

  6. During an RP assembly test, the relief valve is observed dripping slowly. The tester should first:

    Answer: Test the #1 check valve differential to determine if the relief is responding to a failing check

    A dripping relief valve typically indicates the #1 check valve differential has dropped below the relief valve opening point; testing the #1 check first identifies the root cause.

  7. The ABC certification exam for backflow prevention testers is administered under which national standard?

    Answer: ASSE 5000

    The ABC uses ASSE 5000 as the professional qualification standard for backflow prevention assembly testers, covering knowledge and field testing competencies.