air operated diaphragm pumps

What is an Air-Operated Diaphragm Pump & How Does it Work?

While there are many different types of pumps out there, air-operated diaphragm pumps are certainly one of the most popular types. Air-operated double-diaphragm pumps, also known as AODD pumps, fall under the category of positive displacement pumps.

An AODD pump is made up of two pumping chambers that discharge and fill by use of flexible diaphragms. AODD pumps are powered by compressed air, which is fed from chamber to chamber. The pumps can handle a wide variety of different fluids and are praised for being robust and reliable. In this article, we’ll look at how these pumps work and what their most popular applications are.

How do AODD Pumps Operate?

  • Compressed air enters to air supply port and is directed to the left air side cavity.
  • This causes the fluid side diaphragms to move to the left.
  • Compressed air in the right side air cavity exhausts through the exhaust port to atmosphere.
  • As the diaphragms move to the left, suction draws the material into the right chamber past the ball check and pressure forces the material from the left chamber to the outlet manifold.
  • This cycle repeats and creates pump flow.

What Are the Main Features of AODD pumps?

There are so many features and benefits that make AODD pumps so popular. Some of these features and benefits include:

  • Pump cannot overheat
  • Pollution free operation – no exhaust fumes
  • No electrical spark created by pump operation
  • On demand pump performance and 100% efficiency
  • Pumping efficiency remains constant
  • No Foaming or shearing of material
  • Offers variable flow rate
  • Positive priming provides easy pump flow start up
  • Runs dry without damage
  • Totally submersible
  • Handles a wide variety of fluids
  • Lightweight weight – portable
  • No complex controls required
  • No lubrication required to run the pump

air operated diaphragm pumps

Do AODD Pumps Have Any Limitations?

AODD pumps have very few limitations and drawbacks. The system is dependent on a compressed air supply, which may have installation challenges for certain environments. The air needs to be at a higher pressure than the fluid that needs to be pumped. A constant flow is required for effective operation.

The only common problem associated with AODD pumps is icing, which occurs when ice builds up around the air vent. This problem can be solved by ensuring low humidity in the compressed air supply.

AODD Pump Applications

AODD pumps are typically used for transfer applications in the chemical, manufacturing, pharmaceutical industries and a wide variety of other Industry Sectors. These pumps have become extremely popular in factories around the world and have a comprehensive range of applications because of their versatility.

 Are you looking to purchase air-operated diaphragm pumps here in Australia? Here at Airdraulics, we stock a wide range of IR ARO’s air-operated diaphragm pumps. Feel free to browse our pump products online and get in touch with our very knowledgeable team should you have any questions at all!

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