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Benefits of Using a Flexible Impeller Pump


What is a Flexible Impeller Pump? How does a Flexible Impeller Pump work? What are the benefits of using an Impeller Pump? Tapflo's Range of Flexible Impeller Pumps

What is a Flexible Impeller Pump?

A Flexible Impeller Pump is a type of Positive Displacement Pump that features an impeller made from rubber as well as vanes in the pumps housing. Their design enables them to handle thin and viscous (up to 50’000 cPs) fluids as well as solids in suspension (up to 25 mm). They are a highly versatile pump system with a variety of benefits particularly for transferring and filling applications.

How does a Flexible Impeller Pump work?

As the pump operates, the vanes trap a set amount of liquid at the inlet, the pump moves the fluid forward through the pump housing (positive displacement) until it gets to the discharge port where the vanes begin to change again, forcing the media out of the discharge. The vanes of the impeller deform slightly when rotating inside the pump casing, moving the fluid from the inlet to the outlet at a steady, pulse-less flow without pressure spikes.

This principle, combined with a gentle pumping action and a high self-priming capability, up to 6 m from dry, makes these units ideal for transfer, filling, dosing and filtration applications.

What are the benefits of using an Impeller Pump?

Flexible Impeller Pumps are customisable

Each Flexible Vane Pump can be customised to your businesses particular operational requirement. This includes the execution-style of the pump, as well as the material that the impeller can be manufactured from. One of the main advantages of a Flexible Impeller is that it can be fitted to a number of executions including with Geared Motors, Trolley Mounted with various controls or Hydraulically Driven.

Impeller materials can be chosen based on the application of your pump. For example, a customer pumping a hot acid might require an EPDM Impeller, whereas a customer pumping oil might require an NBR Impeller. See below for a full list of materials and applications.

Flexible Impeller Pumps are extremely versatile

We can supply your Flexible Impeller Pump with 5 different material impellers. See all five listed below with some examples of where they would be used. NBR: Has excellent resistance to oils & fats and is FDA Approved CR: the Best balance between chemical & mechanical resistance EPDM: Best for hot fluids & CIP. Excellent with acids & alkalis. FDA Approved NR: Excellent with water-based fluids at room temperature. Highest mechanical resistance VMQ: Best for high temperature, low mechanical resistance

Impeller Material Application
NBR  FDA approved with excellent resistance to oils and fats
CR  The best option for customers requiring chemical AND mechanical resistance
EPDM  FDA-approved ideal for hot fluids and CIP. Excellent with acids and alkalis
NR  Has the highest mechanical resistance and is ideal for water-based fluids at room temperature
VMQ  Ideal for high temperatures and low mechanical resistance

Flexible Impeller Pumps are ideal for the following Pump Duties: 

  • Transferring
  • Filling
  • Emptying
  • Recycling & Mixing
  • Filtering & Separation
  • Metering & Dosing

Flexible Impeller Pumps are typically used for the following industries and applications:


Oenological Wine, musts and stemmed grapes
Food Fruit pulp, juice, honey, syrups, milk, yoghurt, oil, brine and beer
Chemical Ink, paint, detergents, water-based glue, starch, rubber latex and wax
Cosmetic and Pharmaceutical Liquid soap, cream, shampoo and cleaning lotion

Flexible Impeller Pumps are ideal for handling shear-sensitive viscous products, as well as those with solids in suspension. The pumps can handle up to 50’000 cPs and the solids passage capability is up to 25mm, but please check this on our product pages for the specific maximum solid sizes.

Flexible Impeller Pumps have a reversible operation

An added benefit that highlights the versatility of a Flexible Impeller is the pump head’s ability to operate bi-bidirectionally. The head can be reversed simply by flicking a switch on the terminal box of the motor, making the pump ideal for cleaning purposes and refilling upon completion.

Rotation of the Flexible Impeller Pump Head

Not only can the operating direction of the pump be altered but also the rotation of the pump head itself can be changed into 5 different positions. The motor for the pump can be mounted below or above the pump head which, paired with the pump head’s possible 5 positions, enables a Flexible Impeller to be installed into a variety of pipework configurations.

Rotation options of Flexible Impeller Pump Head

Flexible Impeller Pumps are Self-Priming

These pumps can self-prime up to 6m from dry which allows Impeller Pumps to be used for emptying of sumps, tanks, drums, and IBCs.

A Flexible Impeller Pump provides a pulse-free flow

The pump produces a steady flow which is ideal for applications such as filling, dosing, and filtration.

Tapflo's Range of Flexible Impeller Pumps

Tapflo UK is proud to supply a wide range of pump systems for clients as part of our partnership with Italian pump manufacturer Liverani. Take a look below at some of our range and what they have to offer:

Self Priming Flexible Impeller Pump

EP Flexible Impeller Pump

  • Close-coupled design
  • on/off reversing switch
  • can be customised to fit onto trolley systems or with carrying handles
  • Self Priming up to 6m from dry
  • Can operate-bi-directionally

To find out more about the EP series, visit our dedicated Flexible Impeller Pump Article all about the range.

Bare Shaft And Hydraulically Driven Flexible Impeller PumpBare Shaft Self Priming Flexible Impeller Pump

  • Commonly used for loading/offloading applications
  • Lightweight and compact design
  • Versatile port configuration
  • Ability to handle a wide variety of fluids
  • Range of accessories available to create the right solution for your application
  • Variety of material options

VA & INV Self Priming Flexible Impeller Pumps

  • Variable speed control with mechanical variator
  • Accurate flow control with calibrated inverter panel
  • Waterproof & Floating Bi-directional radio controller & charging station with a 100m range.
  • Supplementary 4-20 mA Connector
  • Timing System
  • 4 Wheel Trolley
  • Manual or Spring Loaded By-Passes are available on request

To find out more about Tapflo’s supply of flexible impeller pumps, browse the whole range here

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