Air Operated Double Diaphragm (AODD) pumps are an interesting seal-less, displacement alternative to centrifugal pumps. Here we look at how they work and their potential benefits

Flexible-liner pumps are available in close-coupled configurations with a C-face motor, and frame-mounted designs coupled to a foot-mounted, horizontal motor. These units are self-priming, can be run dry, and can dependably handle slurries and viscous liquids. Like flexible-tube pumps, flexible-liner pumps also tend to produce pressure pulsations. At selected speeds, however, the pumping action is gentle enough to prevent the settling out of suspensions and provide for the effective handling of latex emulsions and similar materials. Duplex designs are available for higher flows and for reducing the pulsation tendency.

The versatility of this pump type, and range of applications that can be accommodated is due in no small part to the wide range of materials than can be used in the construction of both for the pump body and the diaphragms. The diaphragm is literally the heart of the pump. Key factors to take into account when determining the suitability of a diaphragm pump for certain applications are the materials that need to be pumped, the temperature in which they are to operate, the potential effect on the equipment and of course the flex life of the diaphragm.

Tubing: A variety of elastomeric materials, including polyurethane, chlorosulfonated polyethylene, and nitrile, butyl and natural rubber, are available for tubing construction.

Encore® Pump Product Line Certified To NSF/ANSI 61 For Most Common Water Treatment Chemical Applications

German dosing pump specialist, LDT Dosiertechnik GmbH, has recently extended its range of diaphragm pumps by adding the DOSEURO D122N pump to its portfolio

Dover Corporation DOV has completed the acquisition of the All-Flo Pump Company, Limited ("All-Flo"). Headquartered in Mentor, Ohio, All-Flo is now part of the Pump Solutions Group (PSG) business within Dover’s Fluids segment.Notably, All-Flo is a manufacturer of specialty air-operated double-diaphragm ("AODD"), which is used in a wide range of industrial applications to transfer abrasive, viscous and hazardous fluids, sludges and slurries. The acquisition boosts PSG’s leading AODD pump portfolio and expands its geographic presence in the specialty pump market.Dover’s PSG unit is a global leader in the manufacture of pumps, systems and related technologies. The acquisition strengthens PSG’s leading market position, as well as is in sync with Dover’s strategic approach of deploying capital in close-to-core markets with sustainable growth by creating value for shareholders. All-Flo generated around $12 million revenues in 2018 and will likely be accretive to Dover’s margins in the Fluids segment. Moreover, the buyout is anticipated to generate double-digit cash Return on Invested Capital (ROIC) within three years.On Apr 3, Dover’s PSG unit has completed the sale of Finder Pompe S.r.l ("Finder") to Gruppo Aturia S.p.A. The divesture is in line with Dover’s strategy to reduce exposure in highly-cyclical upstream energy markets. It also enabled its PSG business to focus on hygienic pump technologies and positive displacement.Coming to the price performance, Dover’s shares have appreciated around 26.4% over the past year compared to the industry’s growth of 10.6%.

-This article appeared in Pumps and Valves Supplement 2017, a special supplement distributed with WWT, WET News and Utility Week magazines.

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Corrosion and potential metal contamination of the fluid can be prevented by constructing the shaft of Type 300 Series stainless steel, and sleeving the shaft with a thick-walled thermoplastic material.

Chapter 2, to analyze the top manufacturers of Diaphragm Pump, with sales, revenue, and price of Diaphragm Pump, in 2018 and 2019;

Asia Pacific is one of the most prominent regional markets for metering pumps in the world and is slated to register a strong growth rate over the course of the forecast period, fueled by a growing focus on capacity expansion and rising investments from manufacturers. China and India are the leading contributors in this market, driven by strong demand for metering pumps. China’s role in the Asia Pacific metering pumps market has been significant as an end user, thanks to the availability of raw materials at a comparatively lower cost, increasing investments by foreign and domestic parties, and surging end-use applications. Europe and North America are also major players in the metering pumps market and demand for the same can be attributed to established water treatment and industrial sectors.