Backflow Prevention Practice Exam

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When a reduced pressure principle assembly is installed vertically, the relief valve discharge must be _____?

To a floor drain 2 times the piping size
Higher than check valve number 1
Lower than check valve number 1
Piped with the flow directed down

The correct answer is: Lower than check valve number 1

When a reduced pressure principle assembly is installed vertically, it is critical for the relief valve discharge to be lower than check valve number 1 to facilitate proper functioning of the assembly. The relief valve's purpose is to ensure that any backpressure caused by system failure or contamination is relieved effectively. By positioning the discharge lower than the first check valve, any potential contaminant that might escape will be directed away from the water supply, effectively preventing backflow contamination. This configuration minimizes the risk of creating a siphon effect where contaminants could potentially flow back into the drinkable water supply, ensuring that the primary protection of the assembly remains intact. Proper discharge positioning helps maintain the assembly’s integrity and overall backflow prevention effectiveness, which is crucial for public health and safety.