蠕動泵也叫恒流泵或軟管泵，其機械運行原理十分簡單。因為它的運行方式是通過對泵管進行交替重復的機械擠壓和釋放來泵送流體的。之所以叫蠕動泵，也是因為其泵管的運動方式就象一條蠕動的蟲子一樣移動，蠕動泵就是將軟管裝卡在機械轉子和定子之間，以此達到泵送流體的目的。（見圖1）蠕動泵工作時，在兩個滾輪之間的一段泵管會形成泵室，泵室的大小取決于泵管的內徑和轉子的尺寸（見圖2、圖3、圖4）。蠕動泵的理論流量為泵室的容積，拿回轉直徑相同的泵相比較，產生較大泵室的泵，其轉子每轉一圈所輸送的流體容積也較大，但產生的脈沖也較大。相反，產生較小泵室的泵，其轉子每轉一圈所輸送的流體容積也較小，但產生的脈沖也較小，但快速、連續(xù)的泵送可以非常理想地降低脈沖，因此，在一些小流量、要求非常小的脈沖場合，泵頭的選擇就顯得非常關鍵。
Peristaltic pump also known as constant flow pump or hose pump, its mechanical operation principle is very simple. Because its operation mode is to pump fluid through the mechanical extrusion and release of the pump pipe alternately. The reason why it is called peristaltic pump is also because its pump pipe moves like a worm. Peristaltic pump is to install the hose between the mechanical rotor and stator, so as to achieve the purpose of pumping fluid. (see Fig. 1) when the peristaltic pump works, a section of pump pipe between the two rollers will form a pump chamber. The size of the pump chamber depends on the inner diameter of the pump pipe and the size of the rotor (see Fig. 2, Fig. 3, FIG. 4). The theoretical flow rate of peristaltic pump is the volume of pump chamber. Compared with the pump with the same rotary diameter, the pump with larger pump chamber will deliver larger volume of fluid per revolution of rotor, but the pulse generated is also larger. On the contrary, for the pump with smaller pump chamber, the fluid volume delivered by each revolution of its rotor is also small, but the pulse generated is also small. However, rapid and continuous pumping can reduce the pulse perfectly. Therefore, the selection of pump head is very important in some small flow and very small pulse requirements.
