Centrifugal Pumps

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Centrifugal Pumps

Dual Pumps are an innovative manufacturer of Centrifugal Pumps based in the UK. Providing a majority of the pumps we sell, we wholeheartedly recommend them. Centrifugal pumps are driven by one or more impellers and are used for moving liquids. This can be water or any number of fluids viscous or not.

We can supply pumps with either closed or open impellers. Which one is better? Open Impellers are easier to clean should they clog with string-like material. Plus, they are much less likely to get clogged in the first place!

Positive Displacement Pumps

Operating via a decreasing cavity on the pressure side and an expanding cavity on the suction end. The volume is always the same for each pumping cycle.

Have two main categories with several uses for each:

  • Reciprocating Pumps.
  • Rotary Pumps.

The main difference between these and a Centrifugal Pump is that a positive displacement pump operates at the same flow rate regardless of the exit pressure. These ‘Constant Flow Machines’ have a serious feature to consider. Due to their ability to constantly generate pressure, it’s an issue if a valve is closed on the discharge end of the pump.

If a positive displacement pump has to work against a closed valve the pressure in the discharge line will continue to build to breaking point. Either the line or the pump will eventually give in causing dangerous damage to both. The line could burst or the pump could be irreversibly damaged.

To prevent this a relief valve should be installed on the exit side of the pump. We recommend the safety valve to be installed externally with a line back to the suction side or the supplying tank.

Reciprocating Pumps

Split into two classes:

  • Plunger Pumps.
  • Diaphragm Pumps.

A Plunger pump will often have multiple cylinders working out of phase with one another. Therefore, providing a more even flow rate and preventing issues such as vibrations and water hammers.

In a Diaphragm Pump, there is still a plunger but it does not directly pump the fluid. Instead, the plunger pressurizes a hydraulic oil which in turn flexes the diaphragm in the pumping chamber. This type of pump is most often used for toxic or hazardous liquids.

Rotary Pumps

These rotary positive displacement pumps power a wide range of devices:

  • Gear Pumps
  • Lobe Pumps
  • Peripheral Pumps
  • Progressive Cavity Pumps
  • Screw Pumps
  • Vane Pumps

With Dual Pumps as our supplier, we are proud to sell all of these products. As the name suggests, a Rotary Pump is any pump powered by rotation.

Gear Pumps

For example, a Gear Pump works by trapping liquid against the gear teeth of matching gears. The trapping combined with the chasing of the pump provides the pressure that pushes the fluid out the discharge line. Lobe pumps follow a similar principle but use external gears for timing. Whilst the same gears drive two lobes inside the pump that never touch.

Progressive Cavity Pumps

Frequently used for viscous liquids that require a high flow rate or smooth high discharge pressure. Typical uses include:

  • Slurry
  • Mashes
  • Pulps
  • Dough from:
    • Waste Water Treatment Plants
    • Anaerobic Digestion Facilities
    • Paper Recycling Plants

Such a versatile pump lends itself to the pumping of viscous fluids such as additives and chemicals. Thanks to the flow rate and speed being proportional, careful dosing of these products is easy.

Centrifugal Pump Diagram

Centrifugal Pump diagram

All our displacement pumps in this range have centrifugal pump diagrams available in the spec sheet section on their page.

Of course, feel free to contact with us any queries via our Live Chat