Air-Operated Double-Diaphragm Pumps
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Description
An Air-Operated Double-Diaphragm pump (AODD) is a type of positive displacement (PD) pump. It consists of two pumping chambers that are alternately filled and discharged by the movement of flexible diaphragms. Compressed air is alternately fed to, and vented from, air chambers on the opposite sides of the diaphragms to create the pumping action.
AODD pumps are generally used for transfer applications and can handle a wide variety of feeds including sludges, slurries, abrasive and shear sensitive fluids. Although they are robust, reliable and easy to maintain they can be noisy, prone to icing, and are limited to low pressure applications.
- Fuels and oils
- Chemicals and acids
- Resins, glues, paints and inks
- Waste water
- Food and cosmetic product
Application
Air operated diaphragm pumps are a versatile design suitable for the pumping of low and high viscosity fluids, including those that contain high solid content and shear sensitive mediums. The wide variety of materials that the diaphragm can be constructed of combined with the pumps’ seal-less design, means that even aggressive chemicals and acids can be handled.
As AODD pumps are powered by compressed air supply rather than an electric motor, they are a popular alternative solution for installations where mains power may not always be available. This is also why it is common for smaller sized air diaphragm pumps to be used in portable applications, and why they are often used in hazardous environments where in may not be safe to have an electricity supply. They are commonly used in industrial process as compressed air is very frequently used as a powered medium within these environments for driving other tools and equipment.
AODD pumps when fitted with a tube onto the exhaust of the pump which is vented to atmosphere outside the fluid (snorkel) can be submersed in a liquid.
The air operated diaphragm pump design makes it suitable for use in a wide range of industries:
Technical Docs
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