The basic peristaltic pump is like squeezing a hose filled with fluid with your fingers, and slides forward with your fingers to drive the fluid in the tube forward. The basic peristaltic pump also uses this principle, except that the fingers are replaced by rollers. The fluid is delivered by alternately squeezing and releasing the elastic delivery hose of the pump. Just like pinching a hose with two fingers, as the fingers move, negative pressure is formed in the tube and the liquid flows along with it. The basic peristaltic pump forms a "pillow"-shaped fluid in a section of pump tube between two rollers. The volume of the "pillow" depends on the inner diameter of the pump tube and the geometric characteristics of the rotor. The flow rate depends on the product of the speed of the pump head of the basic peristaltic pump, the size of the "pillow", and the number of "pillows" produced per revolution of the rotor. The size of the "pillow" is generally constant (except when pumping particularly viscous fluids). Compared with a pump with the same rotor diameter, a pump with a larger "pillow" volume has a larger volume of fluid delivered per revolution of the rotor, but also a greater degree of pulsation. This is similar to the case of membrane valves. For pumps that produce a smaller "pillow" volume, the volume of fluid delivered by the rotor per revolution is also smaller; the small "pillow" formed in rapid succession makes the fluid flow more stable.

The basic peristaltic pump has only the hose in contact with the fluid. The hose meets the sanitary requirements, and can be easily disinfected online, offline, and quickly replaced. Therefore, it is used in the production of biological raw materials, chemical raw materials, and pharmaceutical preparations. In pharmaceutical companies, it is widely used in various production processes such as material addition, semi-finished products transfer, finished product packaging, and container emptying.

　　

 In order to ensure the cleanliness level of the product after filtration/chromatography, it is required to avoid secondary pollution of the fluid by the equipment in the system during the filtration/chromatography process. The basic peristaltic pump is ideal for pumping fluids in such processes:

　　 1. The basic peristaltic pump can carry out high-precision and stable fluid transmission, and can maintain a stable fluid pressure during the transmission process.

　　2. When the basic peristaltic pump transfers fluid, the fluid only touches the hose. Choosing a hose that meets the sanitary requirements can avoid secondary pollution of the fluid during the transfer process. To transfer different fluids, simply replace the hose to avoid cross-contamination between different fluids.

　　3. The basic peristaltic pump is suitable for transferring liquids containing solid particles. When used in conjunction with a filter, it can effectively remove particles or other suspended solids in the fluid without abrading the pump body and is simple to maintain.

　　4. The basic peristaltic pump has a lower shearing force, and it cannot be replaced by other pumps for the low-loss transmission of biologically active substances in the fluid.