The size of a peristaltic pump "pillow" is generally constant (except when pumping a particularly viscous fluid). Comparing pumps with the same diameter of the rotor, a pump that produces a larger "pillow" volume has a larger volume of fluid delivered per revolution of the rotor, but the resulting pulsation is also greater. This is similar to the case of a membrane valve. Pumps that produce smaller "pillow" volumes have a smaller volume of fluid delivered per revolution of the rotor; moreover, a small, "pillow" formed quickly and continuously provides a smoother flow of fluid. This works in a similar way to a gear pump. The peristaltic pump has high precision: repeatability and high stability. Dear Customer: Thank you for your interest in Shanghai Jiapeng's products. In addition to this product introduction, Shanghai Jiapeng also has three introductions of UV analysis, nucleic acid protein detector, gel imaging analysis system, photochemical reaction instrument, automatic partial collector, etc. If you are interested in Shanghai Jiapeng products, please contact us. Thank you! Folding chair,High Quality Folding chair,Folding chair Details, CN ZHEJIANG HUZOLI METAL PRODUCTS CO.,LTD , https://www.zlplasticfurniture.com