When testing an RPZ assembly, the relief valve must open at a differential pressure no less than:

When testing an RPZ assembly, the relief

Multiple choice — select the best answer

A0.5 psid below check #1 reading
B2.0 psid below the supply pressure
C5.0 psid below the supply pressure
D3.0 psid below check #2 reading

✓ Correct answer: B. 2.0 psid below the supply pressure The RPZ relief valve must open when the differential pressure between the zone and supply falls to at least 2.0 psid. If it opens at less than 2.0 psid the zone may not be adequately protected; if it never opens the device fails.

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Topic: Assembly Types

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When testing an RPZ assembly, the relief valve must open at a differential pressure no less than:

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