Which of the following hazard types can a Pressure Vacuum Breaker (PVB) protect against?

Which of the following hazard types can a

Multiple choice — select the best answer

ABackpressure only
BBack-siphonage only
CBoth backpressure and back-siphonage
DNeither; it is not a backflow preventer

✓ Correct answer: B. Back-siphonage only A PVB protects only against back-siphonage. Because it opens to atmosphere under negative pressure, it cannot seal against backpressure conditions; for backpressure hazards an RPZ or DCVA must be used.

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Topic: Assembly Types

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Which of the following hazard types can a Pressure Vacuum Breaker (PVB) protect against?

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