There are some major sources of air in a pipeline, firstly at startup, the pipeline contains air which must be exhausted during filling. As the pipeline is filled, much of the air will be pushed downstream and released through hydrants, faucets, and other mechanical apparatus. However, a large amount of air will become trapped at system high points.
Secondly, water contains around 2 percent air by volume based on normal solubility of air in water. The dissolved air will come out of solution with a rise in temperature or a drop in pressure which will occur at high points due to the increase in elevation and lastly, air can enter through equipment like pumps, fittings, and valves when vacuum conditions occur.
A water piping system has to be kept under stable operating conditions. Inclusion of air in water transport systems can have negative effects such as flow reduction, pressure fluctuations, water hammer effects, and pumps running dry. However, lack of air in water pipelines can also lead to harmful effects, one such effect is negative pressure arising in pipes due to water flowing off too fast. Because of these reasons, need arises of air release valves for the release of small and large quantities of air from water transport systems.
Air relief valves are probably the most widely used air valves that have small orifice, weighted floats, and leverage mechanism. Air release valves automatically release small pockets of collected air from the pipeline. These automatic air relief valves are usually mounted on the top of the pipes to automatically release the trapped air.
For effectual air release protection and surge alleviation, Dutco Tennant LLC provides the air release valves for potable water systems which are integral air release valves for surge control. The products that we supply include a number of valves that have been designed after intensive research and understanding of water markets. These air pressure release valves serve a number of purposes in addition to their air valve functions such as elimination of water hammer and surge effect in the pipelines.
Features of Our Air Release Valves are:
The different types of air release valves that we supply include Single Orifice, Double Orifice, and Combination types.