Rotary Pumps
Tips & Advice to help you make your decision on Rotary Pumps
There are two different types of rotary pumps; one is known as the positive displacement pump, and the other is a centrifugal pump. In order to achieve the best results, it is important to fully understand the difference between the two.
Centrifugal pumps usually have various levels of flow, depending on the pressure of the liquid being pumped. A positive displacement pump has a constant flow, which is not affected by pressure at all. The main advantage of the centrifugal pump is that it works best when pumping water, making it the pump of choice for the fire service. The positive displacement pump is better with thicker liquids, such as slurry. Because of this, it is popularly used for sewer maintenance, as well as in chemical plants.
There are disadvantages to these two types of pumps. The centrifugal pump requires experienced hands when pumping at full pressure because, as the water pressure increases, it takes greater strength to control it. The positive displacement pump does not have this problem, but it does struggle to maintain an even flow with high-viscosity liquids.
Rotary pumps are used in a variety of different businesses, including professional landscaping firms, drain specialists and pipeline services. The pumps are usually housed in special pumping stations.
Rotary Pumps Key Terms
Understand the technical terms when searching for rotary pumps for your business applicationsBy Howard Robertson Rotary pumps have applications in various equipment, such as hydraulic systems, laboratory equipment and automotive mechanisms. Before searching for a rotary pump that fits your application requirements, you need to be conversant with certain technical terms. Pump manufacturers use various key terms to describe types of rotary pumps and to specify the properties of rotary pumps. This guide will give you an idea about certain popular rotary pump terms, such as rotary gear pumps, rotary vane pumps, rotary lobe pumps and viscosity.
Positive-displacement pumps
In a positive-displacement pump, a fixed amount of fluid is trapped inside the pump body and this trapped fluid is forced out through the discharge pipe. A rotary pump is the most common type of positive-displacement pump.
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Rensselaer Polytechnic Institute provides information about the positive-displacement pump and its different types. You can also read through the description of positive displacement pumps at International Vacuum, an online magazine.
Rotary gear pumps
As the name indicates, rotary gear pumps are comprised of gears to force the fluid. Rotary gear pumps are suitable for high-pressure and high-volume applications.
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Alfa Pumps & Systems, a gear pump manufacturer, provides the basics of gear pumps, including their construction, principle of operation and typical applications.
Internal gear pumps
These are positive-displacement pumps with an internal gear that is driven by the input shaft. The internal gear drives an external gear that rotates around its center. These gear pumps are suitable for pumping fluids that have low viscosity.
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To understand the construction and working of an internal gear pump, you can read through an informative article at Hydraulic Equipment Manufacturers.
External gear pumps
External gear pumps use two identical gears rotating against each other, out of which the pinion is driven by the prime mover and the other gear rotates with it. External gear pumps are useful for applications such as fuel systems and chemical industry equipment.
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Pump School provides information about external gear pumps.
Rotary vane pumps
Unlike rotary gear pumps, rotary vane pumps use vanes in the form of blades, buckets, rollers or slippers. These provide high-pressure applications.
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Cole-Parmer provides information about rotary vane pumps.
Rotary lobe pumps
These rotary pumps are comprised of rotor lobes and are suitable for low-shear applications.
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Hydraulic Institute provides a definition of rotary lobe pumps. You can also read through the basics of rotary lobe pumps at Viking Pump.
Viscosity
Viscosity of the fluid is an important parameter for the design and performance of a rotary pump. Viscosity indicates the resistance of the fluid to flow. The more viscous the liquid, the lower its flowing rate.
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To understand the meaning of viscosity and its units, read through information at STLE. Additionally, Eaton Corporation offers a hydraulics glossary that explains viscosity.
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