Cross Connection Practice Exam

Which component is present in an Atmospheric Vacuum Breaker?

1. Pressure gauge

2. Float check

3. Back pressure valve

4. Backflow preventer

The correct answer is: Float check

An Atmospheric Vacuum Breaker contains a float check as a critical component. This mechanism is essential for its function, as it helps to maintain a break in the water supply system that prevents backflow. The float check operates by allowing air to enter the system to break a vacuum condition, which could otherwise lead to reversed flow of contaminated water into the potable supply. When the water level in the system drops, the float drops as well. If there's a situation that could create a negative pressure, the float's descent opens a vent, letting air in to equalize the pressure and prevent back siphonage. Essentially, this float check ensures that the breaker functions correctly, providing an effective means of preventing backflow by utilizing atmospheric pressure dynamics. The other options, while related to backflow prevention and system pressure management, do not accurately describe a component present in an Atmospheric Vacuum Breaker; they serve different functions or are associated with other types of backflow prevention devices.