Which component in a Reduced Pressure Zone (RPZ) assembly maintains a differential pressure zone between the two check valves?

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Multiple choice — select the best answer

ARelief valve
BStrainer
CAir gap
DBackpressure valve

✓ Correct answer: A. Relief valve The relief valve in an RPZ assembly vents to atmosphere whenever the differential pressure between the two check valves drops below 2 psi, maintaining a reduced pressure zone. This is the defining characteristic of the RPZ assembly.

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Topic: Assembly Types

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Which component in a Reduced Pressure Zone (RPZ) assembly maintains a differential pressure zone between the two check valves?

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