A pressure vacuum breaker must be installed how many inches above the highest downstream outlet?

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Prepare for the WETS Irrigation Technician Exam. Study with interactive flashcards and detailed questions, each one providing hints and clear explanations. Ace your test with confidence!

Multiple Choice

A pressure vacuum breaker must be installed how many inches above the highest downstream outlet?

Explanation:
A pressure vacuum breaker is designed to prevent back-siphonage into the potable supply, and its atmospheric vent must stay open to atmosphere to break any siphon. Mounting it at least twelve inches above the highest downstream outlet ensures the water column in downstream piping cannot rise high enough to reach and seal the vent during pressure drops, shutdowns, or when downstream zones drain. This clearance keeps the vent unobstructed, prevents siphoning of irrigation water back into the supply, and maintains reliable backflow protection.

A pressure vacuum breaker is designed to prevent back-siphonage into the potable supply, and its atmospheric vent must stay open to atmosphere to break any siphon. Mounting it at least twelve inches above the highest downstream outlet ensures the water column in downstream piping cannot rise high enough to reach and seal the vent during pressure drops, shutdowns, or when downstream zones drain. This clearance keeps the vent unobstructed, prevents siphoning of irrigation water back into the supply, and maintains reliable backflow protection.

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