While air valves are often placed on pumps to remove air, their primary use is at high points in pressure piping systems, which are the first locations which can experience negative pressure in water systems and are the most likely places where air can accumulate. They are also used in filling and draining of pipelines which is not addressed in WaterGEMS/CAD. While they are useful in normal operation, they are especially important in transient analysis (available in Bentley HAMMER). ![]() The underlying behavior of the valves is to be closed when then hydraulic grade is above the valve elevation and to open to maintain atmospheric pressure when the hydraulic grade would otherwise have dropped below the valve. ![]() An Air Valve is the model element used to represent air relief valves, air release valves, vacuum breaker valves and combination air valves.
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