Two primary functions are served by air valves in pipeline systems. The first is the release of accumulated air that comes out of solution within a pressurized pipeline. This air results in bubble formation, which gathers at localized high points along with the pipeline profile. When the bubble’s buoyancy is greater than the energy to convey the bubble with the liquid, this accumulation occurs. This free air is released by the air valve.
The second function of an air valve is to admit air into the system when the internal pressure of the pipeline drops below atmospheric pressure. By admitting air into the pipeline as the internal vacuum condition develops, the magnitude of the vacuum pressure can be reduced and as a result help prevent the pipeline from experiencing excessive deflection and/or collapse as well as help prevent the formation of a full vacuum condition in which vapor cavities may form from the fluid vaporizing. In cases like these air and vacuum valves are used.
Single Air Valves ensure that air in the pipe will be automatically evacuated when the pipeline is filled with water. Air is evacuated quickly so that water will not make back pressure and flow negatively. When the water in the pipeline is drained, the air enters into the pipe quickly in such a way that it will not create a vacuum. Generally, it is used in pump downstream, automatic irrigation controller upstream and in elevation differentials emerged by referring water source.
By a double air valve, it is ensured that air in the pipe will get automatically evacuated when the pipeline is filled with water. Air is evacuated quickly so that water will not be able to make back pressure and affect flow negatively. These valves are designed for automatic rapid pipe filling and pipe draining as well as for automatic discharge of accumulated air during normal working conditions. Due to the unique design, the air rushing out of the system cannot force the float upwards and close it prematurely, this makes sure that the valve closes only after all the air has left the system and water has entered the chamber.
The sewage air valve is a high-quality single chamber double function combination air valve which evacuates air during pipeline filling, allows the release of air pockets from pressurized pipelines, and admits large volumes of air in the event of pipe draining/burst, to prevent a vacuum and negative pressure conditions.