A Reduced Pressure Principle (RP) backflow preventer works by maintaining which condition?
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AA higher pressure in the discharge zone than the supply zone
BA lower pressure in the relief zone than in both the supply and discharge zones
CEqual pressure on both sides of the first check valve
DA vacuum between the two check valves at all times
✓ Correct answer: B. A lower pressure in the relief zone than in both the supply and discharge zonesAn RP assembly maintains a reduced-pressure zone between its two check valves. This zone is always at a lower pressure than the supply, ensuring that if either check fails, water flows out through the relief valve rather than backward into the supply.
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Theory