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Working mode of peristaltic pump
Peristaltic pump is a section of pump pipe between two rollers to form "pillow" fluid. The volume of the "pillow" depends on the inner diameter of the pump pipe and the geometric characteristics of the rotor. The flow rate depends on the product of the rotational speed of the pump head and the size of the "pillow" and the number of "pillows" produced by each revolution of the rotor. The size of the "pillow" is generally constant (except when pumping particularly viscous fluids).
Compared with the pump with the same rotor diameter, the pump with larger "pillow" volume will deliver larger volume of fluid per revolution, but the pulsation will also be larger. This is similar to the case of membrane valves. For the pump with small pillow volume, the volume of fluid delivered by each revolution of its rotor is also small; moreover, the small pillow formed rapidly and continuously makes the fluid flow more stable. This is similar to the way gear pumps work.
