What is an AODD Pump?
An air operated double diaphragm pump (AODD) is a type of reciprocating positive displacement pump that is powered by compressed air. Sometimes this pump type is referred to as an air operated diaphragm (AOD) pump. Like any diaphragm pump, they are designed to move liquid by using reciprocating diaphragms to expand and contract a pumping chamber. They're safe, easy to use, and can be used even where electrical power is not available.
How do they work?
There are two pumping chambers within the pump, each with its own diaphragm and set of inlet and outlet check valves. Air enters the non-product side of one diaphragm, and then the other, with the alternating air flow path being created by a shuttle valve on the air supply. As the diaphragms move in one direction, this pushes liquid on the product side of one of the diaphragms out the discharge check valve and into the discharge manifold. At the same time, the movement of the other diaphragm causes liquid to be drawn from the suction manifold, through the inlet check valve, and into the pumping chamber. Then the air shuttle valve reverses, causing both diaphragms to move in the opposite direction. This creates a double acting effect, and what had been the suction side now becomes the discharge side, and vice versa.
Where are they used?
AODD pumps are useful in a wide variety of commercial and industrial applications, including pumping of viscous or difficult fluids such as fuels, glues, paints, resins, and inks. They're also used in the processing of food-based or cosmetic liquids. Air operated diaphragm pumps are built to handle liquids containing solids, and they come in a variety of materials to handle corrosive liquids. Since this pump type creates a vacuum in the inlet when it is pumping, it can be mounted above the liquid it is pumping.
Almatec designs and manufactures air-operated double diaphragm (AODD) pumps for a wide range of water/wastewater, energy, process, and hygienic applications. Almatec offers six pump models, including its E, FUTUR, BIOCOR, CHEMICOR, AH, and CX Series AODD pumps. Almatec’s plastic AODD pumps feature a solid body construction made out of virgin grade PE or PTFE materials that support the forces generated within a reciprocating pump. Almatec pumps also feature best-in-class diaphragms that provide a smooth profile uninterrupted by any seals, maximizing containment and clean-ability. The diaphragms are designed to simplify assembly, reduce air consumption, and optimize performance. For the industrial water treatment applications, the company’s pneumatic diaphragm pumps are used for taking samples, feeding filter presses with sludge, and wastewater neutralization. Almatec’s E-Series air-operated double diaphragm pump is often used in the manufacturing of silicon solar cells and for the hygienic market.
KNOLL America offers several air operated diaphragm pumps for the sanitary market. The company’s Foodboxer pumps are ideal for transferring high viscous liquids with solids. The pumps are self-priming and offer a wide range of materials of construction for optimum chemical compatibility. KNOLL America also offers its Saniboxer diaphragm pneumatic pumps which are designed to pump liquids with apparent viscosity from 1 to 15.000 cps at 20°C.
Wilden offers an extensive line of air-operated double diaphragm pumps, including its Advanced, Original, and Saniflo series AODD pumps. The pumps meet the needs of nearly all industrial, process, and sanitary applications. Wilden offers an extensive selection of elastomers to handle chemical compatibility, suction lift, flow, temperatures, abrasion resistance, and cost. Wilden’s Advanced and Original series of metal and plastic AODD pumps are ideal for mining, oil and gas, pulp and paper and other industrial and process applications. The pumps can handle up to 310 gpm and solids sizes up to 6 inches.
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