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Positive Displacement Pump Guide

What is a Positive Displacement Pump?

A Positive Displacement Pump is a pump that draws in a certain volume of fluids and has the same amount of fluid leaving the discharge side of the pump, therefore, maintaining a constant flow for pumping operations. At Tapflo UK we supply a variety of Positive Displacement Pumps depending on your application.

Positive Displacement Pumps:

  • Rotary Lobe Pump
  • Diaphragm Pump
  • Screw Pump
  • Flexible Impeller Pump
  • Peristaltic Pump
  • Gear Pump

When should I use a Positive Displacement Pump?

There is often a debate as to whether you should use a Positive Displacement Pump or a Centrifugal Pump, however, both have their strengths and weaknesses depending on your application. We recommend using a Positive Displacement Pump if you are handling high viscosity fluids, high pressures or require a low flow rate.

If you’re unsure whether a Centrifugal Pump or a Positive Displacement Pump would suit your application better, then get in touch with the Sales Team today, we’d be happy to talk you through your options.

What Positive Displacement Pumps do Tapflo UK supply?

We supply a wide range of Positive Displacement Pumps, each of which has its own benefits…

Diaphragm Pump

Tapflo Diaphragm Pump RangeWhat are the benefits of using a Diaphragm Pump?

Our Diaphragm Pumps are air operated, they have 2 diaphragms inside, 1 diaphragm creates a vacuum to draw fluid into the pump whilst the other forces fluid out of the discharge port.

  • Can run dry without damage to the pump
  • Self-priming up to 5m from dry suction
  • Fewer components than Standard Diaphragm Pumps on the market
  • Air operated, no electricity needed!
  • Can be fitted with LEAP technology in the centre block to save air consumption and save on running costs
  • ATEX rated available

Swap to Tapflo Diaphragm Pumps today! Not so sure? Here are 7 signs you should swap to a Tapflo Diaphragm Pump!

Lobe Pump

Sanitary Lobe Pump

What is a Lobe Pump?

Lobe Pumps are a versatile pump designed for sanitary applications. The pump is operated by two rotating lobes that create a suction to draw more fluid into the pump, creating a pressure that causes a predetermined amount to flow out of the pump’s discharge port.

For additional information visit our Quick Guide to Pomac’s Sanitary Lobe Pump.

Benefits of the Pomac Pumps Lobe Pump

  • Sanitary Pump, fully EHEDG compliant
  • ATEX rated
  • CIP/SIP friendly (Clean In Place/Sterilisation In Place)
  • Discharge pressure up to 15 Bar
  • Handling temperatures up to 140ºC

Twin Screw Pump

Twin Screw Pump

What is a Twin Screw Pump?

The Twin Screw Pump has been designed to combine all the benefits of a Lobe, Peristaltic, Centrifugal and Circumferential Piston pumps. We supply Screw Pumps with double screws, which rotate to move fluid forward through the pump casing.

Benefits of the Pomac Pumps Twin Screw Pump

  • Self-Priming up to 8m
  • Fully EHEDG compliant for sanitary applications
  • Can dry run for brief periods
  • Pulsation free pumping
  • Discharge pressure up to 16 Bar

Flexible Impeller Pump

Flexible Impeller Pump

What is a Flexible Impeller Pump?

Also known as a Flexible Impeller Pump, these pumps push liquid forwards within the pump by trapping fluid between each vane of the impeller.

What are the benefits of using a Flexible Impeller Pump?

  • Reversible operation
  • Pulse-free pumping action
  • Customisable with a range of executions and Impeller materials
  • Discharge pressure up to 4 Bar
  • Handle fluid temperatures up to 120ºC

Click here for more information on the benefits of using a Flexible Impeller Pump

Peristaltic Pump

What is a Peristaltic Pump?High Pressure Peristaltic Pump

Peristaltic Pump is a versatile pump that is easily maintained due to the main wear in the pump only affecting the hose. The pump creates a pulsating flow created by shoes or rollers on the wall of the hose to push fluid along the hose.

Benefits of a Peristaltic Pump

  • Self-Priming up to 9.8 meters
  • Only the hose comes into contact with the product being pumped
  • Limitless dry running
  • Supplied in low-pressure and high-pressure ranges
  • Simple and robust design

Gear Pump

A Gear Pump is a Rotary Positive Displacement Pump which means their design features rotating cogs/gears that transfer fluid using a forward motion. Both internal and external ranges of Gear Pumps are classified as Positive Displacement Pumps. Tapflo supply a range of Gear Pumps on behalf of Yildiz Pompa for industrial applications.


Benefits of the Yildiz Range include:

  • Accurate and pulseless flow
  • Handle viscous fluids
  • Can operate at high differential pressures
  • Efficient suction lift
  • Bi-directional
  • ATEX rated

If you’re not sure what type of Positive Displacement Pump you require for your application, contact our team of experts who can help create the ideal pump solution for your business.

Want to know more? Contact the sales team for additional support with your application or pump requirements

Contact the sales team today