How does a peristaltic pump work?

Peristaltic pumps are a type of positive displacement pump used for pumping a variety of fluids. The fluid is contained within a flexible hose or tube fitted inside the pump casing. The actual pumping principle, called peristalsis, is based on alternating compression and relaxation of the hose or tube, drawing content in and propelling product away from the pump. 

A rotating shoe or roller passes along the length of the hose or tube creating a temporary seal between the suction and discharge sides of the pump. As the pump’s rotor turns this sealing pressure moves along the tube or hose forcing product to move away from the pump and into the discharge line. Where the pressure has been released the hose or tube recovers creating a vacuum, which draws the product into the suction side of the pump, the priming mechanism. 

Combining these suction and discharge principles results in a powerful self-priming positive displacement action.

Proportional dosing

The perfect seal between the two sides of the pump means that there is no product slip, when coupled with the pump’s linear speed-flow characteristic, it makes peristaltic pumps ideal for dosing.

No cross-contamination

The liquid being pumped never comes into contact with any moving parts because it is totally contained within the reinforced hose or tube. Additionally, as the pumped liquid is totally contained within the hose or tube, this makes a peristaltic pump a hygienic pumping solution with zero chance for contamination. This also reduces maintenance time as the hose or tube is the only wearing part.