Peristaltic Pumps Review

Pump Application and Design

What is a peristaltic pump?

This pump uses positive displacement to squeeze a leak-proof tube or hose, forcing the pumped fluid through the hose. It is ideal for transporting sterile or dangerous fluids because it is one of the few types of pumps in which the pumping mechanism never comes in direct contact with the transported fluid.

Peristaltic pumps can operate within the following ranges:
•    Flows between .2 and 200 gpm 
•    Total head (pressure) between 10 and 250 psi
•    Horsepower between 0.125 and 40 hp

Peristaltic Pump

How do they work?

The pump consists of two main parts: the hose and the rotor. The hose, located along the outer wall inside the circular pump chamber, is made of a tough, chemical-resistant material to ensure no air or liquid leakage. The rotor moves in a circular motion in the middle of the pump chamber. As the rotor turns, rollers or shoes attached to the rotor compress the hose; this forces fluid toward the outlet of the pump while creating a vacuum that draws more fluid into the pump inlet. Most peristaltic pumps are powered electrically. Depending on the size of the pump and the method used to squeeze the hose, there may be oil inside the pump chamber to lubricate the outside of the latter as it is squeezed.

For a peristaltic pump to work properly, it must have the correct hose type and material. The hose should be made with tough material to prevent corrosion and premature wear as it is squeezed, which can lead to leaks. Typically, the hose can be replaced once it is worn.

Where are they used?

Peristaltic pumps are designed to transfer aggressive or potentially dangerous fluids where leaking cannot occur. Specific applications include chemical metering applications, such as pumping chlorine to disinfect swimming pools, and a variety of medical applications, such as IV pumps and dialysis machines. This pump type is also used in industrial and municipal applications that require safe transfer of corrosive or abrasive liquids. They are ideal for scientific research handling hygienic or volatile fluids, and can also be used on a smaller scale for applications such as pumping ink in commercial-sized multicolor printers.

 Contributed by PumpScout staff

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