Where must an Atmospheric Vacuum Breaker (AVB) be located relative to any downstream shutoff valve?

Where must an Atmospheric Vacuum Breaker

Multiple choice — select the best answer

ADownstream of all shutoff valves
BBetween the two shutoff valves
CIt may be on either side
DUpstream of all downstream shutoff valves

✓ Correct answer: D. Upstream of all downstream shutoff valves An AVB must be upstream of all downstream shutoff valves. If a shutoff valve is downstream of the AVB and is closed, pressure can be trapped and held against the AVB, defeating its operation.

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Where must an Atmospheric Vacuum Breaker (AVB) be located relative to any downstream shutoff valve?

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