Backflow Prevention Practice Exam

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If the pressure vacuum breaker air-inlet valve does not open and the gauge indicator does not drop, what could be a possible reason?

A leaking shut-off valve 2 with a parallel installation
A tightly closing shut-off valve number 1
The check valve is failed
The high-pressure bleed valve is open

The correct answer is: A leaking shut-off valve 2 with a parallel installation

The scenario described suggests that the pressure vacuum breaker is not functioning as intended, indicated by the air-inlet valve remaining closed and the pressure gauge not showing a drop in pressure. The correct reasoning points to the possibility of a leaking shut-off valve with parallel installation. When two shut-off valves are installed in parallel, a leak in one can prevent adequate pressure changes within the system, inhibiting the normal operation of the air-inlet valve on the pressure vacuum breaker. The air-inlet valve relies on a drop in pressure to open and allow air into the system to prevent a vacuum. If the second shut-off valve leaks, it can maintain pressure levels, thus keeping the gauge indicator steady and preventing the valve from detecting the necessary drop in pressure to function. Understanding the functioning and interdependence of shut-off valves in a system is crucial for backflow prevention measures. This highlights the importance of regular maintenance and inspection to identify and correct any leaks that could compromise the system's integrity.