Backflow Prevention Practice Exam

What indicates a potential problem with a check valve during testing?

1. A consistent pressure drop

2. A stable reading over time

3. Increased water temperature

4. Filing of test records

The correct answer is: A consistent pressure drop

A consistent pressure drop during testing of a check valve is an indicator of a potential problem because it suggests that the valve may not be properly closing or sealing. This can allow backflow to occur, which compromises the safety of the water supply. Essentially, a properly functioning check valve should prevent backflow by maintaining stable pressure when flow is reversed. If there is a steady decline in pressure, it raises concerns about the integrity and performance of the valve, necessitating further inspection and potential maintenance or replacement. In contrast, a stable reading over time would indicate that the check valve is functioning correctly, maintaining its intended pressure and preventing backflow. Increased water temperature could affect various system components but does not directly indicate a malfunction of the check valve itself. The filing of test records, while important for tracking maintenance and compliance, does not provide direct evidence of a valve's operational status. Thus, consistent pressure drop serves as the most direct and clear indicator of a problem with the check valve during testing.