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Peristaltic and Sinusoidal Pumps - how they work

 
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The cut away image of the bredel hose pump used for the demonstration of peristaltic pumping.

Peristaltic Pumps

  • There is no contamination of the pump or fluid
  • Ideal for slurries, viscous, shear-sensitive and aggressive fluids
  • Easy to install, simple to operate, inexpensive to maintain.
  • Pump design prevents backflow and syphoning without valves
  • Wide range of tubing includes industrial, food-grade and medical

 

Nothing but the hose or tube touches the fluid, eliminating the risk of the pump contaminating the fluid, or the fluid contaminating the pump.

The animation shows fluid being drawn into a pump, trapped between two shoes (in a Bredel hose pump) or rollers (in a Watson-Marlow tube pump), and finally being expelled from the pump. Gaps between packets of fluid are shown only to help visualise the action.

The complete closure of the hose which is squeezed between a shoe and the track gives the pump its positive displacement action, preventing backflow and eliminating the need for check-valves when the pump is not running.


Sinusoidal Pumps


Maintenance takes minutes and can be performed in-place by a line operative. Replace off-the-shelf wear components to restore to “new pump” performance.

 

  • A single sinusoidal rotor creates four evenly sized chambers as it rotates
  • Fluid is “pulled” through the inlet into each chamber in turn
  • The chamber rotates, contracts, closes then discharges fluid through the outlet port
  • The opposite chamber opens to draw in more fluid, resulting in a smooth flow with virtually no pulsation
  • A gate functions as a seal between the inlet and outlet of the pump, preventing fluid escaping
  • Simple maintenance performed in place by a line operative
  • Bi-directional running enables duty fluid to be returned to source
  • Separation between the wet end and dry end ensures no contamination  

Exploded view

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