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AIR OPERATED DIAPHRAGM PUMPS

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Verderair Diaphragm Pumps

Air operated double (AOD) diaphragm pumps or pneumatic diaphragm pumps, are reciprocating pumps where the working elements are flexible diaphragms. They are a leak-free pumping option offering variable flow and discharge pressures.

Features include:

  • self-priming, dry running
  • rugged construction
  • metallic and non-metallic construction
  • various elastomer options
  • anti-freeze / anti-stall and lube free
  • externally serviceable air distribution systems
  • very portable diaphragm pumps

GALLERY

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WORKING PRINCIPLE

Air operated diaphragm pumps are classified as positive displacement pumps and utilise two flexible diaphragms that reciprocate back and forth. They create a temporary chamber which works to draw in and expel the fluid through the pump. The two diaphragms act as a separation wall between the air and the liquid.

First stroke

The two diaphragms are connected by a shaft through the centre section where the air valve is located. The purpose of this air valve is to direct the compressed air to the back of the first diaphragm, which causes it to move away from the centre section. The second diaphragm is performing suction stroke, and the air behind is being purchased out to the atmosphere.

As this occurs, the suction ball is pushed off its seat - allowing the fluid to flow past the ball valve into the liquid chamber.

Second stroke

When the first diaphragm has reached the end of its stroke, the movement of the air is switched from the first diaphragm to the back of the second diaphragm by the air valve. The compressed air pushes the second diaphragm away from the centre block, which results in the first diaphragm being pulled toward the centre block. In the second pump chamber the discharge ball is pushed off its seat, whilst in the first pump chamber the opposite occurs. As this stroke is completed, the air valve leads the air again to the back of the first diaphragm and restarts the cycle.

APPLICATIONS

General industry & manufacturing

  • drum and container transfer
  • dosing
  • ink
  • texture coating
  • paper & pulp
  • general transfer

Water & Wastewater

  • water and dewatering
  • general transfer
  • building services
  • general transfer

Food & Beverage

  • drum and container transfer
  • trade waste
  • sanitary
  • transfer

Chemical

  • acids and chemicals
  • oils and hydrocarbons
  • drum and container transfer
  • dosing
  • acid bath circulation
  • flammable liquid transfer
  • drum transfer
  • CIP chemicals
  • sampling
  • drum cleaning
  • general transfer

Mining

  • acids and chemicals
  • oils and hydrocarbons
  • tanker unloading
  • flammable liquid transfer
  • water and dewatering
  • general transfer

DOWNLOADS

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Verderair Product Brochure

FAQs

How does an AOD Pump work and what is it used for?

We have created detailed articles explaining what a diaphragm pump is used for and how a diaphragm pump works.

How do I read an Air Operated Diaphragm Pump curve?

Global Pumps created a video explaining how to read an determine the values outlined on an AOD pump curve. Watch it here.

We also have a blog article on how to read an air operated diaphragm pump performance curve.

Where can these pumps be used?

Air Operated Diaphragm Pumps can be used in a range of applications. They can be used in chemical processing and to pump paint and other viscous liquids. There are hygienic / FDA approved versions for the food and beverage industry and are a great option for dewatering in the mining industry, and can even be used to pump flammable or hazardous liquids.

What are the main features of an AOD pump?

  • They are self-priming
  • They can run dry without damage
  • They are available in different materials for pumping a range of liquids and dangerous chemicals
  • Leak free

How many sizes and materials are available?

There are seven sizes available, with a variety of different materials of construction available (including plastics and metals).

How do I know what type of AOD pump to buy?

It is important that you match your requirements to the pump’s characteristics and abilities. Here are five important considerations for choosing an AODD pump:

  1. Fluid: the make-up of your process fluid is crucial to the choice of pump. Does it have special or corrosive requirements? Is it clean or does it contain particles (slurry)?
  2. Viscosity: the viscosity of your process fluid is also important. More viscous fluids require more robust pumps to move them.
  3. Flow rate: you need to know how much liquid you need to move per unit time in order to choose both the correct size pump and the correct size of piping
  4. Pressure: the pressure will also be a major factor, one that intertwined with the flow rate, in choosing an appropriate pump. Refer to your pump’s “pump curve” graph to help determine the relationship between flow and pressure.
  5. Temperature: your choice of pump will need to handle the temperature of the liquid being pumped

For more information on the different types of pumps or diaphragm pump flow rate calculations read our informative blog articles.

What kind of fluid does a diaphragm pump transfer?

Any kind.

Examples include water, acids and lubricants. AODD pumps will handle viscous fluids as long as the viscosity has been taken into account when choosing the pump and designing the system, as some highly viscous fluids require large bore piping to be adequately pumped.

Are there specific considerations for plastic diaphragm pumps?

Because they are plastic, they can change shape slightly over time. As will be seen in the answer to the next question, plastic AODD pumps require more frequent inspection to make sure that the bolts holding the pump casing, haven’t become loose. The only other consideration for a plastic pump is to ensure that the fluid being pumped is compatible with the pump’s plastic/material.

Why do air operated diaphragm pumps freeze?

Although Verderair pumps are anti-freeze, we have created an article explaining why air operated diaphragm pumps freeze.

What are the key factors for diaphragm pump maintenance?

The good news is that AODD pumps are comparatively easy to maintain. Importantly, and like every other pump,  regularly scheduled maintenance is crucial. You want to monitor things over time, to prevent mishaps before they happen. There are essentially 4 main things to keep an eye on during the life of the pump, these include:

  1. Quality of the air used to operate the pump. Air can come in many different qualities, with various amounts of water. Impurities are removed by an in-line air-filter. Making sure that this is operated and doesn’t become clogged with debris from poor quality air is important to prevent these particles from reaching the pump and causing premature wear on the pump diaphragms.
  2. Examine the pump’s elastomers (diaphragms) routinely for signs of wear - replace these if necessary.
  3. Make sure you frequently check the fluid inlet and outlet of your pump. If either of these become clogged, it can lead to premature failure of the pump.
  4. If the pump is constructed of plastic, which can change shape over time, becoming compressed, make sure that you check the torque settings of the pump’s bolts.

What is the purchase process? How do I find out pricing for an air operated diaphragm pump?

Our Global Pumps team will discuss the application at hand, fluid being pumped and the environment the pump is entering. This will provide them with the information they require to offer a quote and outline pricing and other considerations that should be made.

Where do you deliver and what is your estimated shipping times?

Below is a guideline of how long it takes to ship our products to major Australian cities. Of course, we can deliver elsewhere around the county. Our team can advise of specific lead times.
Locations Shipping Time Range
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

PRODUCT INFORMATION

Global Pumps offer the following Verderair Air Operated Diaphragm Pumps:

Verderair-AODD-VA40ppVerderair Air Operated Diaphragm - Non-metallic Series

The Verderair non-metallic series double diaphragm pumps are suitable across multiple industries, including ink and paper, surface finishing, car wash chemicals and water-based paints.


There are four construction materials available in the non-metallic series:

  • polypropylene - wide chemical compatibility, general purpose and limited temperature resistance
  • conductive polypropylene - like standard polypropylene but electrically conductive
  • PVDF -polyvinylidene fluoride or polyvinylidene difluoride is a highly non-reactive thermoplastic fluoropolymer produced by the polymerisation of vinylidene difluoride. 
  • acetal - compatible with many solvent applications and can withstand extreme fatigue. Good resistance to abrasive media and is conductive for ATEX applications.
Verderair-AODD-VA40ssVerderair Air Operated Diaphragm Pumps - Metallic Series

Global Pumps suggest the metallic series for process fluid that is abrasive. The Verderair metallic series are offered in aluminium, cast iron and SS316. These Verderair metallic series are commonly utilised in slaughterhouse waste, waste water, chemical transfer, ceramic slurry and solvent-based paints.

There are three construction materials available for the metallic series:

  • aluminium - general purpose, good for solvent-based coatings and inks, resistant to mild chemicals
  • cast iron - highly abrasion resistant, often used in paper, wastewater industry and mining
  • stainless steel 316 - resistant to most acids, bases and solvents, can handle halogenated hydrocarbons, good resistance to abrasive media

Air operated diaphragm pumps are controlled by means of compressed air being applied to the air valve incorporated into the pump. The air valves’ unique design guarantees a perfect, non-stalling operation, even at low pressure and does not need any lubrication.

Enquire here for more information or to request a quote: