These valves are installed on all high points of a system where it has been determined dual function air vacuum and air release valves are needed to release air. Air release valves can open against internal pressure because the internal lever mechanism multiplies the float force to be greater than the internal pressure. The apco clean water air release valves arv function to release air pockets that collect at each high point of a pressured pipeline and are essential for pipeline efficiency and water hammer protection.
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