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Air operated double diaphragm pumps make a comeback

Air operated double diaphragm pumps provide an interesting sealless alternative to centrifugal and positive displacement pumps, and are invaluable for applications where it is impossible or dangerous to use electricity. First introduced more than 40 years ago, more recent innovations in pump design and the construction of the diaphragms are boosting demand for these pumps. Tom Rozee provides the details.

Introduction
While air operated double diaphragm (AODD) pumps have never been away, their popularity has been making something of a comeback over recent years. Indeed there are many manufacturers of AODD pumps throughout the world.

Introduced over 40 years ago, the AODD pump has seen a number of innovations and offers an interesting sealless, displacement alternative to centrifugal pumps. AODD pumps are not always the first choice in pump selection, yet they have found applications in a wide range of industries.

These include chemicals, food processing, paints, electronics, construction, industrial maintenance, utilities, processing, wastewater and sludge processing, and mining. With interesting variations on design principles and new diaphragm designs being introduced, these pumps offer a number of benefits that set them apart from alternative pumping methods.

They are self priming, will run dry without damage and need no electricity. Powered entirely from compressed air, they can be used in a number of applications where electricity is not available or must not be used, such as hazardous or explosive environments or at remote sites. AODD pumps come in a variety of sizes, shapes and materials of manufacture.

How the AODD pump works
The basic principle of operation of the AODD pump is shown here.

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