| A pump head consists of only two parts:
the rotor and the housing. The tubing is placed in the
tubing bed between the rotor and housing where it is
occluded (squeezed). |
The rollers on the rotor move across
the tubing, pushing the fluid. The tubing behind the
rollers recovers its shape, creates a vacuum, and draws
fluid in behind it. |
A pillow of fluid is formed between the
rollers. This is specific to the ID of the tubing and
the geometry of the rotor. Flow rate is determined by
multiplying speed by the size of the pillow. This pillow
stays fairly constant except with very viscous fluids. |
