FAQs
How does an AODD Pump work?
An air operated double diaphragm pump uses compressed air to move two flexible diaphragms in an alternating motion. As one diaphragm creates suction and draws fluid into the pump, the other discharges fluid, creating a continuous reciprocating pumping cycle. For a more detailed explanation, read our guide to how an air operated diaphragm pump works.
What are the key features of an AODD pump?
AODD pumps offer several features that make them suitable for demanding industrial fluid transfer, including:
- dry self-priming
- ability to run dry without damage
- variable flow and pressure controlled through the air supply
- operation against a closed discharge valve
- no dynamic or pressure-loaded seals
- metallic and non-metallic construction options
- fixed or portable diaphragm pump configurations.
The Global Pumps AODD range includes standard models with discharge pressures up to 8.6 bar, with high-pressure models available for applications requiring up to 16 bar liquid pressure.
What fluids can AODD pumps transfer?
AODD pumps can transfer a broad range of fluids, including water, chemicals, oils, solvents, paints, inks, wastewater, slurries and viscous media. Different metallic and non-metallic diaphragm pump materials are available to accommodate different fluid properties and operating environments.
The pump body, diaphragm, valve seat and ball materials must be compatible with the fluid being transferred.
What industries use air operated diaphragm pumps?
Air operated diaphragm pumps are used across industries including chemical processing, mining, water and wastewater, manufacturing, food and beverage, paints and coatings, and general industrial processing.
Common duties include chemical transfer, drum and container emptying, slurry and wastewater handling, dewatering, dosing, tanker unloading and the transfer of hazardous or flammable fluids.
What sizes and materials are available?
Global Pumps supplies AODD pumps across a range of sizes and metallic and non-metallic construction options.
Non-metallic options include polypropylene, conductive polypropylene, PVDF and acetal, while metallic pumps are available in aluminium, cast iron and 316 stainless steel. The available sizes, materials and performance capabilities vary between product ranges and models.
Refer to the individual AODD product range for detailed specifications, or speak with Global Pumps about your requirements.
How do I choose the right AODD pump?
The right air operated diaphragm pump depends on factors including the fluid being transferred, required flow and pressure, viscosity, solids content, temperature, chemical compatibility and operating environment.
Global Pumps can assess your application, fluid properties and operating environment to recommend an appropriate AODD pump solution.
How do I read an air operated diaphragm pump performance curve?
An AODD pump performance curve shows the relationship between flow rate, discharge pressure and compressed-air requirements, helping determine how a pump will perform at a particular duty point.
Watch our video explaining AODD pump performance curves, or read our guide to reading an air operated double diaphragm pump performance curve. .
Can an AODD pump run dry?
Yes. AODD pumps can run dry without damage, making them suitable for applications where the fluid supply may be intermittent, including drum and container emptying, dewatering and portable fluid transfer.
Are there specific maintenance requirements for non-metallic diaphragm pumps?
Non-metallic diaphragm pumps should be inspected regularly as part of routine maintenance. Important checks include bolt torque, chemical compatibility and the condition of the pump casing and wetted components.
Bolt torque is particularly important with plastic pump constructions, as changes in compression over time can affect sealing.
Why do air operated diaphragm pumps freeze?
Freezing can occur when compressed air expands through the pump's air system, causing the temperature to drop. Moisture in the compressed-air supply can then freeze around the exhaust and interfere with pump operation.
The AODD pump range incorporates design features intended to reduce the risk of exhaust freezing. For more information about the causes and preventative measures, read our guide to stopping double diaphragm pumps from freezing.
What maintenance does an AODD pump require?
Air operated diaphragm pumps have relatively few moving components, but routine inspection and maintenance are still important for reliable operation. Key areas to monitor include:
- compressed-air quality and moisture
- diaphragm and other elastomer condition
- inlet and outlet fluid pathways
- pump connections and fasteners
- bolt torque, particularly on non-metallic models.
Global Pumps also provides technical support and servicing for air operated diaphragm pumps.
What is the process for purchasing an AODD Pump?
Our Global Pumps team will assess your application, fluid properties and operating environment to recommend the best AODD pump solution. We’ll then provide a detailed quote covering pricing, lead times and relevant compatibility considerations.
Contact Global Pumps with your application requirements to discuss the most suitable pump for your project.
Where do you deliver and what are your estimated shipping times?
We ship our air operated diaphragm pumps Australia-wide. Below is a general guide to delivery times for major cities, but our team can confirm specific lead times for your location or project.
| Locations |
Shipping time frame |
| Melbourne |
1-2 days |
| Sydney |
2-3 days |
| Brisbane |
2-4 days |
| Perth |
2-4 days |
| Adelaide |
1 day |
| Kalgoorlie |
3-5 days |
| Mt Isa |
3-5 days |
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