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- peristaltic-pumps
Peristaltic Pumps
Our portfolio of peristaltic pumps offers different platforms covers a wide performance spectrum. Using these platforms as a framework, customer specific modifications and new solutions can be generated with speed and ease.
A peristaltic pump is generally used for conveying liquids. The pumping mechanism is through deformation of a tube pushing the liquid in a pre-determined direction. Such pumps can be found in medical equipment, hazardous liquids systems, concrete conveyors, air conditioners and also in commercial dishwashers. Peristaltic pumps have wide ranging applications.
Advantages of Peristaltic Pumps?
Tubing for peristaltic pumps can be made compatible with many different media. Additionally, peristaltic pumps are also suitable for continuous operation. They can be cleaned and sterilised with ease since the media is contained withina smooth walled envelope without the use of valves. The media is therefore not contaminated with lubricants. This advantage is especially important in the medial market or other applications which are extremely sensitive to cleanliness. The service requirements are extremely low with only the tube needing periodic replacement. Additionally, very low quantities or very sensitive liquids can be dosed with the correct peristaltic pump.
One disadvantage is that due to the construction, a peristaltic pump can pulsate. Under some operating conditions, pressure peaks can arise. Pressure dampers can be used to reduce this effect.
How does a Peristaltic Pump Operate?
A peristaltic pump operates through principle of peristalsis. The media flows through a tube which is generally in a U shape within the pump. The outer of the tube sits against the body of the pump whilst the inner side of the U shape is pushed by a shoe or guide. Often these guides are in the form rollers rotating over the surface of the tube. At pressure above 3 bar rollers are not generally used since they will no longer rotate, and a fixed mechanical shoe is the better choice. Such shoes are often contained in a bath of lubrication of certain oils or glycerine. This protects the tube from wear.
The guides or rollers rotate around the rotor and transport the media section by section through the pump. Once the media exits the pump the tube reopens and parallel on the inlet side new media is sucked into the tube. The faster the rotor turns the higher the flow rate of the pump. At higher speeds, the tube is worked harder. For pumps to be used in continuous operation, to increase life, it is often sensible to reduce the speed.