Backflow Prevention Practice Exam 2025 – 400 Free Practice Questions to Pass the Exam

Question: 1 / 400

When should the air-inlet valve of a pressure vacuum breaker open?

When water starts flowing

When the pressure exceeds a certain limit

When there is a drop in system pressure

The air-inlet valve of a pressure vacuum breaker is designed to open when the pressure within the system drops below atmospheric pressure. This function is crucial because it allows air to enter the system, which helps prevent back-siphonage and maintains the overall integrity of the plumbing system. By opening in response to a drop in pressure, the valve ensures that a vacuum does not form, which could potentially lead to contaminants being drawn into the potable water supply.

Opening under these conditions serves as a protective measure against cross-connection contamination. The air-inlet valve effectively creates a pathway for air to equalize pressure, thereby preventing backflow incidents. The timing of this action is essential for maintaining proper water quality and safety standards in plumbing systems.

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When shut-off valve 1 is opened

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