Backflow Prevention Practice Exam

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What must be checked regularly to ensure the proper functioning of an atmospheric vacuum breaker?

Water temperature
Air inlet valve condition
Piping diameter
Pressure levels

The correct answer is: Air inlet valve condition

An atmospheric vacuum breaker (AVB) is a critical device used in backflow prevention to protect the potable water supply from contamination due to back siphonage. Regular checks of the air inlet valve condition are essential for ensuring the proper functioning of the AVB. The air inlet valve allows air to enter the system when a negative pressure is detected, preventing a vacuum from forming in the water system. If the condition of this valve is compromised—whether due to dirt, wear, or damage—it may fail to open, allowing a vacuum to form that can lead to backflow incidents. Checking the air inlet valve ensures that it is free from blockages and can operate effectively when needed. In contrast, while water temperature, piping diameter, and pressure levels are important factors in the overall system, they do not directly impact the operation of the atmospheric vacuum breaker itself in the same way that the condition of the air inlet valve does. Therefore, regular checks of the air inlet valve condition are paramount for maintaining the safety and compliance of the backflow prevention system.