![]() Positioned on the inlet air valve of the AODD pump, the MizAir unit delivers precisely timed and gauged pulses of compressed air at the beginning of each pump stroke, and it closes immediately afterwards. ![]() ![]() It analyzes pumping performance with a microprocessor, and uses that information to modulate a high-flow, normally open, two-way air valve. Patent #7,517,199) is designed to decrease compressed air consumption in AODD pumps. How the MizAir® Electronic Controller Works The higher the pressure, the slower the stroke frequency. The more viscous a material is, the higher the pressure needed to push the diaphragm and move the medium. They typically run at 85 to 95 psi, depending on the application. The speed of the strokes impacts how much compressed air flow (in cfm) the AODD pump consumes. That’s obviously pretty bad for shop air and for the people paying the power bills.”Įach full extension of a diaphragm is called a press stroke. In some cases, a certain amount of compressed air goes straight through the pump and out the exhaust. “But, while it is switching, it is constantly blowing out compressed air. “Whenever the compressed air fills all the way in one of the diaphragms, the valve switches the air so it goes into the opposite diaphragm,” Jon Lister, Electrical Engineer at Proportion-Air, explained. Compressed air is wasted during the transition between diaphragms.įigure 1: On a typical AODD pump, compressed air pushes the diaphragm (blue), which then forces the liquid up and out of the chamber (bypassing a ball valve). The poppet valve then triggers the inlet air valve to direct incoming compressed air to the suction-side of the diaphragm pump, reversing the whole process. Once the pressurized diaphragm is fully extended, it activates a poppet valve. At the same time, the other diaphragm moves toward the center, creating a low-pressure zone and pulling liquid into the vacated chamber with atmospheric pressure. The two diaphragms operate in paralleled oscillation - as one diaphragm is pushed by compressed air away from the center section, it forces liquid out of the pump. We also spoke with Hank van Ormer, President of Air Power USA, to get insight on the real-life application of MizAir electronic controllers on AODD pumps.Ĭompressed Air Logic: Air-Operated Double Diaphragm PumpsĪir-operated double diaphragm pumps use compressed air pressure to generate diaphragm force and move a liquid medium. Goodman of the Indiana IAC, along with Jon Lister, Electrical Engineer, and Larry Brown, Sales Manager, from Proportion-Air, Inc. ![]() To learn more about the project, Compressed Air Best Practices® Magazine spoke with Dr. The results were promising, and showed a potential reduction in compressed air consumption of 20 to 50 percent when the MizAir was applied to an unregulated AODD pump. Presented by Goodman at the World Energy Engineering Conference (WEEC) 2015, the study tested four different AODD pumps - running them with and without an electronic controller. In their study, they ran comprehensive pump tests using MizAir®, an electronic controller manufactured by Proportion-Air, Inc. However, uncontrolled AODD pumps can be absolute energy hogs, so Goodman and his team evaluated the viability of electronic controls for saving energy. They work with several second- and third-tier automotive facilities whose AODD pump applications include chemical cleaning and paint removal.ĪODD pumps have several advantages: they can handle aggressive chemical or physical product throughputs they can run empty without catastrophic failure and they can be repaired quickly. Goodman and his colleagues at the IAC help small and mid-sized manufacturing companies become more competitive by saving on energy costs. then turn the air off when they don’t need the pump.” “The pump has internal controls that cause the diaphragms to slam back and forth continuously. David Goodman, Ph.D., C.E.A., Assistant Director of the Indiana Industrial Assessment Center (IAC) and professor at IUPUI. “The typical situation we see is there is no controller attached,” explained Dr. Per van Ormer, “No air-operated equipment should run uncontrolled.” However, a good number of manufacturing facilities still run AODD pumps without controllers. They are used for all kinds of liquid transfer applications, like those found in chemical manufacturing, wastewater removal, and pumping viscous food products.Īs ubiquitous as they are, AODD pumps are also commonly misused. As estimated by veteran compressed air auditor Hank van Ormer of Air Power USA, approximately 85 to 90 percent of plants in the United States have AODD pumps. Air-operated double diaphragm (AODD) pumps are common to many manufacturing facilities.
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