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What are Peristaltic Pumps ?

Peristaltic pumps work by pushing a fluid through a tube.  The liquid is moved in a tube due to the formation of constrictions.  The impeller of the pump consists of two wheels which press against the tube and move the constrictions and the liquid.

The advantage of this pump is that the medium does not come in contact with the impeller.  Hence, this pump is widely used in the field of medicine.  Many life support systems use this pump as they handle body fluids such as blood.

Peristaltic pumps are also used in the food industry where the purity of the food is to be maintained.