Pumping is one of the challenging tasks in the process industry. Depending on the company’s area of operations, content to be pumped vary, and hence the choice of pumps also differs. However, peristaltic is one of the pump types that is capable handling various kind of contents including abrasive, viscous, high density, corrosive, etc. This feature makes the pump ideal for varied purposes such as yeast pumping, vending machine applications, chemical pumping and many more.
By design, the peristaltic pump is ideal for the dependable handling of abrasive, corrosive, viscous, high density and high solid content fluids. It thrives in those applications where other types of pumps fail. Water and waste water industries, mining and chemical processing are all prime markets for this workhorse. But being equal to the tough demands of these applications is far from its only strength. The peristaltic pump can also be extremely versatile.
Different hose and tube options allow this pump to handle an exceptionally wide range of fluids, there is also a huge choice of flow rates and pressures to suit almost every application. And perhaps somewhat overshadowed by its dominance in heavyduty slurry and sludge handling is the peristaltic pump’s eminent suitability for handling shear sensitive products. It has a smooth, squeezing action that makes it ideal for use with flocculants, sensitive polymers and fragile cell cultures.
Versatile Peristaltic Pump
The growing awareness of the peristaltic pump’s wider potential is leading to its increased use in less arduous fields of application. It is regularly specified by the printing and packaging industries in place of air diaphragm pumps as it is gentle on the product but still able, for example, to handle viscous metallic inks. The food, drink and pharmaceutical industries are also regularly installing this type of pump. This is because the pumped product is isolated from the workings, there’s no danger of contamination and it’s easy to sterilize.
Another key factor in the rising popularity of the peristaltic pump is its fit-and-forget quality. Its lack of valves, seals and glands makes it inexpensive to maintain. Indeed the only replacement part on a peristaltic pump is the hose or tube, a relatively low cost item that is easily exchanged. These are important qualities as companies strive to optimize production processes and minimize costly downtime.
Design Basics of Hose Pumps
In order to expand on why a peristaltic pump is the best choice for a wide spectrum of applications, we first need to consider the design principles. Key to its success is the fact that the medium being pumped is completely contained within a reinforced hose. A rotating shoe or roller passes along the length of the hose creating a total seal between the suction and discharge sides of the pump.
As the pump’s rotor turns, this sealing pressure moves along the hose forcing the product to move from the pump and into the discharge line. When the pressure has been released, the hose recovers creating a vacuum which draws the product into the suction side of the pump, the priming mechanism. Combining these suction and discharge actions results in a self-priming positive displacement pump.
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