Backflow Prevention Practice Exam

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What is the minimum loading required to open a pressure vacuum breaker's air-inlet valve?

1 psi (6.89 kPa)
2 psi (13.8 kPa)
3 psi (20.7 kPa)
4 psi (27.6 kPa)

The correct answer is: 1 psi (6.89 kPa)

The minimum loading required to open a pressure vacuum breaker's air-inlet valve is 1 psi (6.89 kPa). This is essential for maintaining the proper functioning of the backflow prevention device, allowing it to break any potential vacuum condition within the system. When a vacuum forms, it can lead to the backflow of contaminated water into the potable water supply, posing a health risk. The air-inlet valve needs to open at this minimum pressure to allow atmospheric air to enter the system, thus preventing any dangerous vacuum conditions. If this pressure threshold were higher, it would delay the opening of the valve, increasing the risk of vacuum formation and backflow. Hence, 1 psi represents the lowest necessary pressure to ensure safe and effective operation of the pressure vacuum breaker.