Business — May 2, 2022 at 12:26 pm

Why Are Air Valves Used in Applications Involving Water and Wastewater?


The constant expulsion of air is necessary for the reliable and productive operation of a water system. Under typical conditions, water contains roughly 2 percent dissolved air or wastewater gas; however, the water’s pressure and temperature within the pipe system can cause it to contain far more air and gas than this.

Pipes are the fundamental component of all water distribution systems. These pipes carry water from the point of origin to the location where it is ultimately consumed. As a result of this process, there is a possibility of pockets of air becoming trapped within the pipes. It is difficult to identify pockets of air and wastewater gasses, which will result in the overall efficiency of the pipe system being reduced. Problems with water hammers, complete cessation of flow, pipe bursts, system noise, and pipe corrosion are some of the other potential outcomes of air pockets. Air in the pipeline can also result in control valves, meters, and other equipment that operate in an unstable manner. It is therefore very necessary to continuously remove air and wastewater gasses from the water system to ensure that the operation is both safe and effective.

What causes air to be present in pipes

Every fluid transmission system contains some amount of dissolved air. The following are the primary sources:

  • Incomplete filling of the line, which results in the formation of air pockets at the peaks of the pipeline
  • Air that has been dissolved in the fluid and is then released when either the pressure or the temperature increases.
  • Air coming into the system that has been drawn in from various holes, such as joints, breaks/bursts, and attachments.

If the volume of the air and wastewater gas pocket reaches a certain size, which is especially likely to occur at pipeline peaks where air pockets naturally collect, a restriction of the flow will occur, which will produce unnecessary head loss and run the risk of the water flow coming to a complete halt. This is especially likely to occur when the volume of the air and wastewater gas pocket reaches a certain size.

The actual purpose of air valves in a system

Air release valves are hydro mechanical devices that are meant to expel any air or wastewater gasses that have become trapped within a pipe system while it is being filled, drained, or operated. They help to maintain a steady flow in the pipes, which is essential to the water system’s ability to operate effectively.

The internal float mechanism causes pressure to build up inside the water pipe, and air valves let the pressure out by releasing it. Additionally, air valves guarantee the intake of air while draining, which helps to keep a positive pressure. This is essential because certain pipe materials can rupture when subjected to negative pressure. It is important to keep in mind that combination air valves can be used in place of air release or air/vacuum valves at any spot along the pipeline to give additional air release capacity.


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