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Centrifugal
Positive Displacement
Drum Barrel
Miscellaneous |
Learn More about Pumps
Centrifugal
Positive Displacement
Drum Barrel
Miscellaneous |
Centrifugal Pumps
Centrifugal pumps are made in many shapes and sizes, and differ from one another both internally and externally to an appreciable degree. In spite of appearance, all centrifugal pumps use the same mechanical principle. Pumping action is obtained from an impeller driven by a shaft or magnetic coupling which is connected to a motor or some other driving device. The impeller rotates (cw or ccw direction of rotation) at a high rate of speed (usually 1725 or 3450 rpm), and the liquid being pumped flows from the eye (center) of the impeller to the outside (periphery) of the impeller by centrifugal action. As the liquid flows from the periphery of the impeller, it is guided to the discharge port of the pump by a volute shaped passage. All centrifugal pumps bring liquid in at the center of the impeller, and move it outward between the blades.
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Positive Displacement Pumps
Positive displacement pump imparts energy by mechanical displacement. Piston, diaphragm, plunger, screw, vane, and gear pumps are some examples.Centrifugal pumps are essentially high liquid volume-low pressure. A large amount of liquid can be carried between the blades of the impeller, but as this is not a positive displacement pump, the volume of liquid drops with the back pressure (head in feet) applied. A PD pump large enough to match the volume of delivery of a centrifugal pump would have enormous gears or diaphragms, and be impractical. On the other hand, to obtain the pressures of a PD pump, the impeller diameter of a centrifugal pump would have to be increased to an enormous size, and this would also be impractical. However, multistage centrifugal pumps can be used in place of PD pumps in many applications. |
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Drum Barrel Pumps
Drum Barrel pumps come in all types(centrifugal or positive displacement), sizes (pail, drum, totes, IBC) and drive (electric, pneumatic, manual hand) options. Drum Barrel pumps depending on the above criteria can produce flow rates from less than 1gpm to over 50gpm. Some drum pumps are made for metering applications and are very precise or controlled flow rate.
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Miscellaneous Pumps
Miscellaneous pumps cover the pumps named by their application. All are really a part of the centrifugal or positive displacement pump types. These include metering, chemical injection pumps, proportioning, battery operated, pump and tank systems, batch control, eductors and mixers.
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