across a variety of industries. From petrochemicals to food and beverages they are widely used and adaptable. Their unique design is perfect for the transfer of highly abrasive and viscous substances. How do they function?

air operated diaphragm pumps can be described as a form of positive displacement pump which uses compressed air as the power source. Compressed air gets moved between one chamber and the other via an attached shaft which allows two chambers to move at once. The back-and-forth motion pushes liquid from one chamber and into the discharge pipe while the other chamber is filled with liquid simultaneously.


A crucial point to remember regarding compressed air is that when air exits in the compressor, it’s typically warm, dirty, wet and not controlled. Air that is dirty and unregulated could cause damage to AODD pumps. In order to set air-operated diaphragm pumps to be successful it’s essential to supply them with the highest quality air available.

Filter regulators can help with air filtration and pressure control. This device will eliminate liquid and solid contaminants, and ensure constant, clean air pressure.


The pumps employ diaphragms that rotate and check valves for pumping fluid. These diaphragms with flexible construction are made from a variety of materials . They should be chosen in order of compatibility with chemicals first.

The chambers for liquids are filled with and then empty by the fluid which is drawn through a common outlet and discharged through one outlet.

Double diaphragm pumps operated by air are able to lift suction well and can deal with sludges as well as liquids with a significant quantity of grit and solids. AODD pumps can also be utilized in the handling of extremely viscous liquids.


Based on the kind, composition and behavior of the solids contained in the fluid that is pumped The AODD pump could be equipped with flap valves or ball valves. They operate by utilizing the pressure variations within the pumped liquid.

Flap valves work best with massive solids (up to line size) or slurries with solids. Ball valves work best with solids with a tendency to settle or float or suspend.

Another major difference in the ball valve pump and flap valve pump is ports for suction as well as discharge. For ball valve pumps suction ports are situated at the lower part in the pumps. When using flap valve pumps suction ports are placed above, allowing it to better deal with solids.

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It is vital to know that typically there is a periodic pulsation in discharge flows in diaphragms operated by air pumps. This could cause excessive motion in the system for pumping. The pulsating flow could be reduced by making use of the pulsation dampeners within the discharge piping.

Pulsation dampeners take energy from the pulse waves created from AODD pumps. They create a zone with low pressure within the system, with enough volume to absorb the pulse.

The pulsation dampener consists of an elastomer with an air cushion that compresses behind it that is able to flex in order to take on the pulse creating a laminar flow in the direction from the dampener.

AODD pumps provide simple technology and reliable pumping for a variety of different industries. Talk to an experienced engineer about whether this kind of pump is suitable for your needs. With its low cost of purchase and maintenance costs this pump could be the ideal choice to the requirements and budget.