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About Rotary Lobe Pumps
Rotary lobe pumps are positive displacement (PD) pumps that use rotating lobes to direct flow. They are similar to gear pumps in terms of operation in that fluid flows around the interior of the casing. Because of their different configuration, however, rotary lobe pumps can reduce the shear effects commonly associated with gear pumps. Moreover, unlike gear pumps, the rotary lobes do not make contact because of external timing-gears located in the gearbox.
With rotary lobe pumps, multiple lobes on the rotating elements provide the ability to drive large solids and slurry-laden media. Typically, they are available in double-lobe or triple-lobe configurations. The number of lobes on each rotating element determines this number. Determining which style of pump is better for a given application requires an analysis of the solids size, liquid viscosity, and tolerance of flow pulsation. Rotary lobe pumps with two lobes are suitable for handling larger solids and high-viscosity fluids, but pulsate more than three-lobed devices.
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Engineering Web: Rotary Lobe Pumps
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