Home > Peristaltic pump
A peristaltic pump is a type of positive displacement pump used for pumping a variety of fluids. The fluid is contained in a flexible tube fitted inside a circular pump casing (though linear peristaltic pumps have been made). A rotor with a number of cams ('rollers', 'shoes' or 'wipers') attached to the external circumference compresses the flexible tube. As the rotor turns, the part of tube under compression closes (or 'occludes') thus forcing the fluid to be pumped to move through the tube. This process is called peristalsis and is used in many biological systems such as the gastrointestinal tract. Peristaltic pumps are typically used to pump clean or sterile fluids because the pump cannot contaminate the fluid, or to pump aggressive fluids because the fluid cannot contaminate the pump.
Higher pressure peristaltic pumps which can typically operate against up to 16 bar, typically use shoes and have casings filled with lubricant to prevent abrasion of the exterior of the pump tube. Lower pressure peristaltic pumps, typically have dry casings and use rollers. High pressure peristaltic pumps typically use reinforced tubes, often called 'hoses', and the class of pump is often called a 'hose pump'. Lower pressure peristaltic pumps typically use non-reinforced tubing, and the class of pump is sometimes called a 'tube pump' or 'tubing pump'.
Since the only part of the pump in contact with the fluid being pumped is the interior of the tube, it is easy to sterilise and clean the inside surfaces of the pump. Furthermore, since there are no moving parts in contact with the fluid, peristaltic pumps are inexpensive to manufacture. Their lack of valves, seals and glands makes them comparatively inexpensive to maintain, and the use of a hose or tube makes for a relatively low-cost maintenance item compared to other pump types.
Typical applications
- Dialysis machines
- Food manufacturing
- Beverage dispensing
- Pharmaceutical production
- Sewage sludge
- tabletop decorative fountains and waterwalls
Pumps
