Advantages Peristaltic Pumps
Every peristaltic pump features a flexible hose or tube, giving an open flow path which gives a high resistance to abrasion and permits the easy flow of solids, high S.G. and viscous media. Despite the capacity for pumping some of the world's most difficult fluids, the pump itself delivers a gentle pumping action, making it suited for shear-sensitive product such as polymers and even whole fish!
The flow of the pump is proportional to the speed, making it suited for dosing. As a peristaltic pump is available both in large and small models, it may be used from laboratories to mining applications.
The hose prevents cross-contamination. For safety and peace of mind, the pump has no mechanical seals and in the event of a hose rupture, contains the fluid safely.
How do peristaltic pumps 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.
The perfect seal between the two sides of the pump means that there is no product slip, and when coupled with the pump’s linear speed-flow characteristic, it makes peristaltic pumps ideal for dosing.
The liquid being pumped never comes into contact with any moving part 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.
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