Ragazzini peristaltic pump

The basic principle of the Peristaltic hose Rotho pump traces back to human “peristalsis” a term referring to the alternating contraction and relaxation of muscles around a tube to force the contents through it. An elastomeric tube is squeezed along a length by rollers that push the fluid contained within. 
The tube’s restitution after squeezing produces a vacuum that draws fluid continuously into the tube. This creates a gentle pumping action that doesn’t cause any damage to the product. Contaminations are avoided because the fluid is contained within the tube (one contact part with product).& The pump employs a rotor with rollers mounted on it that continually compress and occludesome portion of the tube. This action moves the fluid through the tube with a constant rate of displacement for each revolution of the rotor, enabling a precise measurement of the volume of fluid pumped through the tube.

The “roller on bearings” design of the Rotho pump offers many advantages:
 

• It eliminates the requirement for adding a lubrication fluid inside the pump housing, because there is no friction on the surface of the tube therefore giving a longer tube life. 
   
• it requires smaller drives, so less power installed, compared to others peristaltic pumps, to get the same rpm and capacity. 
   
• they can transfer food products with no contamination hazards, as the pump housing is lubrication free. 
   
• with no lubrication fluid required, hose replacement is greatly simplified and cheaper without having to drain and dispose of a messy and possibly contaminated oil or glycerine solution.