During an RPZ field test, the differential pressure across the first check valve (check #1) must be at least how many psid to pass?

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Multiple choice — select the best answer

A1.0 psid
B2.0 psid
C3.0 psid
D5.0 psid

✓ Correct answer: A. 1.0 psid The first check valve of an RPZ must maintain a differential pressure of at least 1.0 psid when tested. The relief valve must open at 2.0 psid below the supply pressure, but the check itself is evaluated at the 1.0 psid threshold.

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Topic: Assembly Types

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During an RPZ field test, the differential pressure across the first check valve (check #1) must be at least how many psid to pass?

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