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AODP-Air Operated Diaphragm Pumps are used for the most difficult and most corrosive fluids in a wide range of applications including pure acids, purification and ceramic sludge, chemicals, oil, fuel, solvent, alcohol derivatives, food and pharmaceutical raw materials. Graco Husky pumps are widely used in applications such as transfer, circulation and non-sensitive dosing applications, spray gun feeding in paint applications.
Positive diaphragm pumps with positive displacement are preferred more and more by their simple and reliable structures, usage, maintenance facilities, low investment and operating costs.

General features:
Graco Husky Air Operated Double Diaphragm Pumps can self prime from upto 5.5 m dry and  9 m deep suction with a liquid and they have a maximum fluid outlet pressure of 8.4 bar. Pump models have a wide product range from ¼ “ - 19 l / min to 3 “ - 1130 l / min depending on the input-output and capacity specifications.

Materials that come into contact with fluid are:
316 Stainless steel for housing, Aluminum, Cast Iron, Polypropylene, Acetal, PVDF, PTFE, PE
For internal components Teflon, Viton, Santopren, Hytrel, NBR, Geolast.

Advantages:

- Ex-proof due to air driven structure instead of electric motor
- No consumables like mechanical seal, packing etc. 
- No risk of damage in case of dry operation
- If the discharge line is closed, the pump stops spontaneously without damage
- Air supply pressure can be regulated by air regulator and can be operated in different flow and pressure range.
- There is no tightening, sliding or rotating part.
- Disassembly and maintenance is very easy.
- Maintenance costs, parts prices are cheap.
- Only the wear parts are diaphragm, ball valves and valve seats. 
- It can work in temperatures up to 100 degrees.
- They can be used in portable-portable applications due to their compactness.
- Viscous products with fluids, liquids with high solids can be transferred.

Usage areas :

• Chemical and Petroleum Industry: Transfer of glue, solvent, detergent, paint and petroleum products,
• Wastewater Treatment Plants: Acid, lime dosing, filter-press applications, wastewater and sludge transfer
• Pharmaceutical and Cosmetic Industry: Transfer of alcohol with high viscosity materials such as cream and pomade,
• Food Industry: Milk, buttermilk, oil, cream, chocolate, fruit concentrate transfer,
• Ceramic and sanitary ware: Ceramic mud and glaze transfer,
• Paint and Glue Producers: All kinds of chemical materials transfer,
• Shipyards and Shipbuilding Industry: Bilge water, blasting residue, discharge of wastes
• Textile Sector: Chemical transfer, dye injection to printing machines,
• Automotive Sector: Transfer of waste oil and sludges to paint booths
• Meat and Fisheries, Slaughterhouses: Fish oil, blood and other waste transfer
And Husky pumps are used safely for many other opplications .

Considerations in Pump Selection:

The fact that the pneumatic diaphragm pumps can be used for the transfer of both very easy and very hard fluids increases both the number and the importance of the points to be considered during the selection of the correct pump.

When choosing a pneumatic diaphragm Graco Husky pump, it is necessary to know the most basic two aspects:

1) Fluid to be transferred
2) The system including pump and piping to transfer this fluid

Therefore, when selecting a pneumatic diaphragm pump, we have to know below for the fluid :

• Name and chemical formula
• Physical properties (temperature, viscosity)
• It is important to know the solids content and the maximum grain diameter.

In relation to the general system, the following parameters directly affect the pump selection.

• The depth, length and diameter of the suction line
• Height, length and diameter of the discharge line
• Flow rate and operating pressure required

Once the above information has been obtained, it is possible to select the materials suitable for the fluid as well as to calculate the correct outlet pressure of the pump by calculating the load losses in the suction and discharge line of the pump.

However, the selection of the correct pump is not possible by taking into account only the above variables.

The pump users should be able to learn both the structural and performance characteristics of the pump they supply from the manufacturers. Because, it is very common to encounter more than one pump model that can perform the same task. In such cases, users should be very careful and take into account the costs (pump life, spare parts consumption) after the purchase of the pump. At this point, the following issues are of great importance:

• The design of the pump to be supplied must be simple. The simple design brings great convenience to the user during assembly and dismantling or during the dismantling and reassembly of the pump for maintenance purposes and ensures that the service time is reduced to a minimum. When viewed from this angle; Pneumatic diaphragm pumps with bolted connection where the diaphragm is clamped by means of clamps which are clamped with clamps placed around it are the most advantageous products in terms of maintenance.

• The most common problem in the operation of this type of pumps is to stop the operation of the pump in both diaphragm cavities by fixing the pilot valve, which controls the directing of the compressed air, in a central point in the slot where the pilot valve moves during the take-off. Pump users should ensure that there is a special drive spring pilot valve designed to prevent this problem in the pumps they supply.

• Pneumatic diaphragm pumps are the most important and most frequently changing spare parts. The diaphragms are mechanically deformed due to displacement and stretching and become inoperable at the end of their life. Users should pay attention to the stroke lengths and diaphragm diameters of the pumps they supply and prefer pumps with large diameters and low stroke lengths. In this way, they will have provided a longer-life diaphragm and will minimize their total costs. Under normal conditions, the diaphragms are designed to perform 3 to 30 million strokes depending on the material.