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Diaphragm Pumps

In partnership with ARO, a leading global manufacturer of fluid-handling products, Liquid Movers supplies a wide range of air- and electric-operated diaphragm pumps. Diaphragm pumps are positive displacement pumps that use a flexible diaphragm to move fluids. They are designed to handle a range of fluids, from thin and viscous liquids to slurries and solids, and are suitable for various industries. Our range of pumps is available in metallic and non-metallic variants. Each diaphragm pump in the range is designed for long service life and incorporates features that lower the total cost of ownership.

Our diaphragm pumps range

AOD pump distributed by Liquid Movers
Air-operated Diaphragm Pumps

This series is designed for corrosive chemical and industrial applications and offers a wide selection of materials and porting options. These diaphragm pumps are suitable for transfer, filling, recirculation, and batching duties. They are available with electronic interface capability, allowing for more controlled and automated operation.

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electric diaphragm pump
Electric Diaphragm Pumps

Our electric diaphragm pumps use an electric drive to move flexible diaphragms, providing an efficient substitute for compressed-air diaphragm pumps. Electric diaphragm pumps can reduce energy expenses by more than 20% compared to competing models and technologies, while ensuring dependable, leak-resistant fluid management. They are available in five construction materials and are designed to manage a variety of corrosive and aggressive fluids.

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Click here to watch a video on the ARO EVO Series pumps overview.

What are diaphragm pumps and how do they work?

Diaphragm pumps, also known as air-operated diaphragm (AODD) pumps, are positive displacement pumps that use pressurised air to compress and expand the diaphragm, causing a suction and discharge action that moves fluids.

These pumps are ideal for handling viscous or abrasive fluids, including oils, chemicals, and sludge. They are versatile and can be used in various industries, such as chemical processing, food and beverage, mining, and wastewater treatment.

Our diaphragm pumps deliver peak performance, offering maximised flow rates, reduced air consumption, and minimised pulsations. These pumps are self-priming, sealless, and feature a leak-free design. In the event of a leak or equipment failure, the pump is designed to shut down automatically, keeping personnel and operations safe. Additionally, our diaphragm pumps can be customised to meet our clients’ industry-specific fluid requirements.

Fluid pressure can be adjusted up to 8.6 bar using an air filter and a needle valve. Depending on the pump size, they can run from 1 l to 1079 l per minute.

View our AODD pump in action

Frequently asked questions

A diaphragm pump is a type of positive displacement pump that transfers fluids using a flexible diaphragm.

Diaphragm pumps work by using the flexing back-and-forth motion of a flexible diaphragm to move fluids. As the diaphragm moves back and forth, it creates a vacuum on one side and pressure on the other, which forces fluid through the pump.

Diaphragm pumps offer several advantages, including self-priming operation, the ability to run dry for short periods, and reliable handling of corrosive, abrasive, viscous, or solid-laden fluids. Their sealless design helps reduce leakage risk, making them suitable for chemicals and hazardous liquids. They are also durable, easy to maintain, and capable of variable flow control. Air-operated diaphragm pumps are especially useful in flammable or explosive environments because they do not require an electric motor at the pump.

Diaphragm pumps are used in many industries, including:

  • Chemical processing
  • Water and wastewater treatment
  • Food and beverage production
  • Mining
  • Oil and gas
  • Paints, coatings, and inks
  • Pharmaceuticals
  • Agriculture
  • Marine applications

They are especially useful for pumping chemicals, viscous liquids, abrasive fluids, and fluids containing solids.

An AODD pump, or air-operated double diaphragm pump, uses compressed air to move two diaphragms back and forth. While one chamber fills with liquid, the other discharges liquid.

Most diaphragm pumps are self-priming and can lift fluid from below the pump inlet. The exact suction lift depends on pump size, design, fluid properties, and whether the pump is wet or dry.

Important maintenance factors for diaphragm pumps include regular cleaning, inspection of the diaphragm and valves, lubrication, checking fasteners and connections, monitoring performance, and replacing worn components.

Get the ideal pump for your specific application requirements.

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