What is the function of a Pressure Vacuum Breaker?

The function of a Pressure Vacuum Breaker is to prevent backflow in water systems. Backflow occurs when water flows in the opposite direction than intended, which can happen due to a drop in water pressure or a vacuum being created in the system. The Pressure Vacuum Breaker is specifically designed to protect potable water supplies by automatically allowing air into the system when a vacuum forms, thus preventing the potential backflow of contaminants or polluted water from entering the clean water supply.

This device is commonly used in irrigation systems and other applications where the risk of backflow is present. Its design incorporates a check valve that opens when negative pressure is detected, allowing air to enter the system and breaking the siphon effect that could cause contaminated water to flow back into the drinking supply. By serving this critical protective role, the Pressure Vacuum Breaker helps ensure the safety and integrity of water systems.