Cross Connection Practice Exam

Which component primarily protects against backpressure?

1. Double Check Valve

2. Reduced Pressure Principle Valve

3. Atmospheric Vacuum Breaker

4. Pressure Vacuum Breaker

The correct answer is: Reduced Pressure Principle Valve

The Reduced Pressure Principle Valve is specifically designed to protect against backpressure, which is a situation where there is an increase in pressure in the downstream system that could allow contaminants to flow back into the potable water supply. This valve maintains a reduced pressure zone in the downstream piping and consists of two independent check valves with a relief valve installed between them. If backpressure occurs, the relief valve opens to allow any unwanted pressure to escape, thus preventing the potential contamination of the water supply. This design makes it highly effective in settings where there are potential sources of backpressure, such as irrigation systems and industrial applications. The ability to maintain a distinct reduced pressure ensures that any backflow resulting from increased pressure conditions does not compromise the integrity of the drinking water system. In contrast, while the other options may protect against backflow in different contexts, they do not primarily address backpressure in the same comprehensive way as the Reduced Pressure Principle Valve.