This is NOT a Lobe Pump

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What do you mean this isn't a lobe pump? In this Pump Report Chad goes over what makes CIRCUMFERENTIAL PISTON pumps different than their rotary lobe counterparts. To learn more, visit vikingpump.com
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Hi, I'm Chad Wunderlich with Viking Pump - and this is a lobe pump. And this is a lobe pump. And THIS is a lobe pump - but this...isn't. You're watching the Pump Report. This is a circumferential piston pump and it's commonly mistaken for a lobe pump. And that's not surprising. With their front covers on, both pumps look very similar with a rotor case in the front and a gear box with timing gears in the back. Both are rotary positive displacement pumps with non-contacting rotors. Both are commonly used for food and beverage applications where the pumps require frequent cleaning or need to meet third party sanitary standards, like 3A. So why is this not a lobe pump? What's the difference? The difference is in the design of the pumping elements, called rotors. In a lobe pump the tips of the rotors run in close clearance to the rotor case wall and to each other. In a circumferential piston pump, the rotors run in close clearance to the rotor case wall and to the hubs in the rotor case or front cover. So the rotors and hubs identify this as a circumferential piston pump and not a lobe pump. But what advantages does this bring and in what applications might a circumferential piston pump be a better choice. First, many circumferential piston pump models like Viking Pump's TRA®10 for example, are designed to be easily disassembled for cleaning. Applications like meat processing commonly require this type of cleaning to facilitate thorough sanitation and ease of inspection. Circumferential piston pumps are easier to disassemble and reassemble than lobe pump designs. Circumferential piston pumps are also capable of higher pressure than their lobe counterparts. Viking Pump offers models with differential pressures up to 500 PSI. Higher pressures are often needed for high viscosity liquids or when pushing liquids through downstream filters. Lastly, the large carrying cavities and the scoop-shaped wings on each rotor help make circumferential piston pumps better for handling large solids like those found in salsa, fruit preserves, or cookie dough. So there are more similarities than differences between lobe and circumferential piston pumps, but understanding those differences can make it so you don't overlook circumferential piston pumps in the right application. To learn more about lobe pumps and circumferential piston pumps, or view other Pump Reports, please visit our website at vikingpump.com.