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Air Operated Double Diaphragm (AODD) Pump Guide | Antliaworks

Air Operated Double Diaphragm (AODD) Pump Guide | Antliaworks

Air Operated Double Diaphragm (AODD) pumps have a range of applications across various industries. Here, we shares the tips and tricks he’s picked up when it comes to maintaining AODD pumps. AODD pumps are the real workhorses of the industrial pump world and are used in a wide range of industries. These include chemicals, food processing, paints, electronics, road construction, maintenance for industrial processes, electricity production facilities, food processing, wastewater and sludge processing, and mining.They are self-priming, will run dry without doing any damage and use no electricity. Powered completely from compressed air, they are used in applications where electricity is not available or must not be used, such as hazardous or explosive situations or at remote sites.

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The Basic Components of an AODD Pump


AODD pumps are particularly versatile in being capable of pumping fluids from fluidised dry powder to shear-sensitive liquids, viscous liquids and abrasive slurries. AODD pumps contain fewer moving parts than many other types of pumps and therefore require less maintenance, yet provide easy access to those parts that may need servicing.

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Advantages of an Air Operated Double Diaphragm AODD Pump:


AODD pumps benefit from their simplicity of operation. Figure 1 shows a schematic diagram of an AODD pump, where A & B are the diaphragms, 1-4 the ball valves and I and O the inlet and outlet ports respectively. The air valve is usually a shuttle valve to route the compressed air alternatively to each diaphragm. The movement of diaphragm A towards the middle of the pump generates a partial vacuum in the chamber. This makes ball valve 1 close, while ball valve 2 opens as air pressure moves liquid from the inlet into the chamber. At the same time, diaphragm B compresses the volume in its chamber, which closes valve 3 and forces fluid past valve 4 and out through the outlet port. When the air valve drives back the movement of the diaphragms, fluid is pumped through the left hand side of the pump. 

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Useful information on Air operated double diaphragm AODD pumps :

 AODD pumps are very reliable since they have very few moving parts and components that can wear. They compare very favourably with pumps that have close-fitting sliding or rotating mechanisms, where the passage of abrasive slurries, for example, can cause excessive wear to the moving parts of the pump.

Key factors to consider for preventative maintenance are:

1. Diaphragm lifetime

2. Compressed air quality

3. Flushing of pumps after use.

Air operated double diaphragm pumps is a type of positive displacement pump but what sets it apart, is that it uses compressed air to operate. There are various advantages of using an air operated double diaphragm pump (AODD), but today, let’s conclude with a quick overview of this type of pump’s control mechanism. When you connect compressed air to an AODD pump, it goes into an air motor which directs the air to push a diaphragm, ‘pushing the liquid out’. The diaphragm which gets pushed is connected to a shaft which will pull the opposite diaphragm creating a cavity on the other side, ‘drawing in the liquid’.

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Air Operated Diaphragm (AODD) Pump

AODD pumps(also known as Air operated diaphragms pumps, pneumatic diaphragm pumps, AODD pumps, AOD pumps) are used for endless applications in mining, industrial and general plant service. Powered only by compressed air, they are especially used where electricity isn’t available, or in explosive or flammable areas. AOD pumps are a type of reciprocating diaphragm pump which contains two diaphragms driven by compressed air. Air section with shuttle valve applies air alternately to the two diaphragms, each diaphragm has a set of check/ball valves.

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