Backflow Prevention Practice Exam

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What is the purpose of a pressure vacuum breaker in a water system?

To increase water flow rate
To prevent back siphonage
To control system pressure
To filter sediment from the water

The correct answer is: To prevent back siphonage

A pressure vacuum breaker is designed specifically to prevent back siphonage within a water system. Back siphonage occurs when there is a drop in pressure in the water supply line, which can cause contaminated water to be drawn back into the potable water system. The pressure vacuum breaker works by using an air inlet valve that opens to allow air into the system if there’s a negative pressure, thus breaking the siphon and preventing the reverse flow of contaminated water. This device is essential for protecting drinking water supplies from potential contamination due to backflow, ensuring public health and safety. The other options do not align with the function of a pressure vacuum breaker. For instance, increasing water flow rate or controlling system pressure involves different types of devices and mechanisms, such as pumps or pressure regulators. Additionally, filtering sediment from water pertains to filtration systems rather than a backflow prevention device.