Additionally, as the tube opens to its natural state after the passing of the cam fluid flow is induced
to the pump. This process is
called peristalsis and is used in many biological systems such as the gastrointestinal tract. The body of fluid is then transported,
at ambient pressure, toward the
Peristaltic pumps may run continuously, or they may be indexed through
to deliver smaller amounts of fluid.
are used in a wide variety of industrial applications. Their unique design makes them especially suited to pumping abrasives and viscous fluids.
The pumped fluid
contacts only the inside surface of the tubing thereby negating concern for other valves, O-rings or
seals that might be incompatible
with fluid being pumped. Therefore, only the composition of the tubing that the pumped medium travels
through is considered for
The tubing needs
to be elastomeric to maintain the circular cross section after
millions of cycles of squeezing
in the pump. This requirement eliminates a variety of non-elastomeric polymers that have
compatibility with a wide range of chemicals. Popular elastomer for pump tubing is silicone which is common with
water-based fluids, such as in bio-pharma industry.