Backflow Prevention Practice Exam

What indicates that a pressure vacuum breaker is functioning properly?

1. The valve remains open during operation

2. There is a continuous water flow

3. The air inlet valve remains closed

4. Water does not flow back into the source

The correct answer is: Water does not flow back into the source

A pressure vacuum breaker is designed to prevent backflow by allowing air to enter the system when a drop in pressure occurs, effectively breaking the vacuum that could potentially draw contaminated water back into the potable water supply. The correct indicator of proper function is that water does not flow back into the source, confirming that the breaker is successfully preventing backpressure and maintaining the integrity of the drinking water supply. This function is vital in protecting against contamination, ensuring that any potential backflow is effectively mitigated. While it’s important for the valve to function correctly and water to flow under normal operating conditions, the primary purpose of the pressure vacuum breaker is to prevent backflow. Other options may describe aspects of the mechanics at play, but they don't directly signify the essential function of preventing contamination, which is expressed in the correct answer.