Backflow Prevention Practice Exam

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What symptom may indicate a failing air-inlet valve in a pressure vacuum breaker?

Water leaking from test cock 1
Chatter or noise during flow
Inability to maintain pressure
Prolonged spillage from the air-inlet

The correct answer is: Prolonged spillage from the air-inlet

A failing air-inlet valve in a pressure vacuum breaker can lead to prolonged spillage from the air-inlet. This symptom indicates that the valve is not functioning correctly, which prevents it from stopping water from flowing out through the air-inlet when the system is operating under normal conditions. A properly functioning air-inlet valve allows air to enter the system when needed, helping to maintain the appropriate pressure. When the valve is compromised, water can continuously leak out, indicating it is not sealing properly. This prolonged spillage is a clear sign that the air-inlet valve is failing and requires attention to prevent backflow or other system malfunctions.