Pumps and Hoses
Frequently asked questions

What is a peristaltic pump?

A peristaltic pump is a positive displacement pump.  The word peristaltic comes from the Greek word “peristaltikos”. Peristalsis movement refers to the wavelike muscular contractions of the digestive tract or other tubular structures by which contents are forced onward toward the opening. In a peristaltic pump, fluid is pushed through a tube or hose by rollers or shoes compressing the tube/hose.Peristaltic pumps are commonly divided into two categories, namely:

  • Tube Pumps: These are typically low flow and low pressure, utilising an extruded elastomeric tube within the pump.•
  • Hose Pumps: These are typically higher flow and higher pressure, utilising a fabricated rubber hose with internal reinforcement braids.
Can a peristaltic pump handle dense slurries?

Yes, with hose-type peristaltic pumps, high density and high viscosity products are regularly handled with ease.

Is a peristaltic pump the best option for handling chemicals?

One of the advantages of peristaltic pumps is that the fluid being pumped is contained entirely within the hose. There are various tube and hose materials available offering a range of chemical compatibility options. Peristaltic pumps are routinely used for the dosing of chemicals due to their repeatable accuracy.

Where are peristaltic pumps most commonly found?

Peristaltic pumps can be found in a wide variety of applications, typically where other pumps struggle, such as high density and high viscosity applications, self-priming, high suction lift applications, as well as shear sensitive and dry run applications. Peristaltic pumps can be found in almost every industry from mining and food to water treatment, brewing, paper, pharmaceutical and even fishing.

I am experiencing pulsation problems. What can I do to fix this?

When they are being used, peristaltic pumps inherently create pulsations. If a peristaltic pump is correctly sized and installed, pulsations can be reduced to an acceptable level. However, incorrectly sized and poorly installed pumps can experience high pulsations leading to poor performance and poor hose life. In certain applications, suitable pulsation dampeners can be installed to alleviate pulsation problems. If you are experiencing pulsation issues, please contact Technical Support in the first instance.

How will cavitation affect the peristaltic pump?

Cavitation issues are not normally associated with peristaltic pumps. Peristaltic pumps generally have low NPSH requirements, and if pumps are correctly selected and applied, cavitation issues can be avoided.

Are AFX pumps available with flame-proof options?

Flame-proof options are available; however, specific requirements should be discussed with Technical Support as Hazardous Area Certification can vary from country to country (e.g. Atex and ETL).

Is there technical support outside of South Africa which is available to clients?

Yes, technical and sales support is available through authorised agents and sister AFX companies. Please contact your local sales representative for more details.