10 Jul
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Peristaltic pumps are simple, efficient, reliable, accurate,
and suited for a wide range of media. A hose peristaltic pump drives fluid alternately
by passive hose decompression to form a seal and by hose relaxation to withdraw
liquid in. To ensure the pumping objective of your pump, choosing appropriate
hoses is essential. The following factors should be seriously considered when
selecting hoses.
- Consider materials of the inner layer in the hose in terms
of chemical property, application temperature, abrasion, and FDA requirements.
These factors are essential for conveying specific fluids.
- The hose should have an appropriate wall thickness (2-fold) to
match the fixed gap width between the rollers and the hose track wall encased
in a peristaltic pump head. Otherwise, the hose decompression may not seal the
tubing, which would lead to inefficient pumping or no pumping.
- Choose an appropriate inside diameter (ID) of a hose for
your specified flow rates. The hose ID and the rotor speed, in most extent,
determine the pump flow rates. A flow rate range is often defined by a specific
peristaltic pump with a selected hose.
- The outside diameter (OD) of a hose should also be
appropriate for the head. If the hose is oversized, it may cause excessive
stress on the pump head and the gearbox, resulting in shortened life of the
hose, the gearbox, and/or the pump. On the other hand, an undersized hose will
work well if the wall thickness matches the pump head.
- The outside surface finish might also be considered. If incorrect, the higher friction between the roller/shoe and hose will result in accelerated wear and increased energy consumption.
- Cost, cost, cost! Some hoses are expensive because they may
be specially designed and manufactured for special applications, for example
FDA requirements. For general use, low-cost hoses should be first considered.
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