ACV Valve: Designed to avoid "Dry-Start" due to air pockets in plumbing lines. Air pockets can occur at any time, both with city water or well-pumped water. Normally caused by thermal expansion and dissolved oxygen in water lines. The ACV valve eliminates these potential problems by not allowing the unit to activate prematurely and thus avoid a "Dry Start". This is a key component and works in perfect union with the pressure relief valve.
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