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Diaphragm Pumps: What You Need To Know

Tapflo Pumps are known across the globe for our range of high-quality Diaphragm Pumps. Our specialist team of pump experts have the knowledge and years of experience supplying reliable, high quality pumps to a variety of industries due to our range including Industrial and Hygienic Diaphragm Pumps. The full Tapflo range also includes a 5-year guarantee, so you can rest assured knowing your pump will live a long life with Tapflo’s engineers on hand to help with any issues!



What is a Diaphragm Pump?

A Diaphragm Pump, otherwise known as a Positive Displacement Pump, is a type of pump which uses an alternating PTFE (Polytetrafluoroethylene) or rubber diaphragm to pump a fluid such as foodstuffs or chemical liquids under pressure.

The majority of Tapflo’s Diaphragm Pump range is air operated (AOD) but recently an Electrically Operated Double Diaphragm (EODD) Pump was introduced to the range.

How Does an Air Operated Diaphragm Pump Work?

The Tapflo Diaphragm Pump is driven by compressed air. The two diaphragms, connected by a diaphragm shaft, are pushed back and forth by alternately pressurising the air chambers behind the diaphragms using an automatically cycling air valve system. This allows a set amount of liquid to enter the put at the inlet and as the diaphragms move, they force the liquid out lifting the ball valves.

How does an Electrically Operated Diaphragm Pump work?

The pump is driven by a motor shaft that was modified to create a reciprocating force (left to right) to drive the diaphragms, as rotation is typical rotational. This was achieved by an eccentric shaft, with a cam and piston which is used to essentially convert the moment from rotary to reciprocating. This force then drives the diaphragms, as usual, using one diaphragm in one of the chambers to create a suction action when being pulled back from the housing. Simultaneously, the diaphragm in the other chamber transmits the pressure to the liquid in the second chamber, pushing it towards the discharge port.

Our EODD Pumps are available in hygienic, metal and HDPE/PTFE executions to suit a range of industries. Find out more about Tapflo EODD Pump.

Benefits of Tapflo’s Air Operated Diaphragm Pumps

Tapflo AOD Pumps have a compact design and have a simple operating principle whilst still meeting the demands of our customers with heavy industrial applications. Below are some of the main benefits of a Tapflo Diaphragm Pump:

  • Can be run dry without damage
  • Easy to use, no need for guarding device
  • Infinitely variable flow control
  • Flexible and easy to adjust
  • Few components
  • Low downtime and maintenance costs

Can a Diaphragm Pump Run Dry?

Yes, Diaphragm Pumps can run dry and against closed valves without damage. Other features of AOD’s include easy cleaning and draining, gentle pumping with no damage of sensitive products, hygienic surfaces made from polished stainless steel, flexible installation, no leakage and environmentally friendly.

If you would like to learn more about the technical specifications and Diaphragm Pump performance curves, please download our manual.

Long Life Diaphragms

As an industry leader amongst Diaphragm Pump Manufacturers since 1990, Tapflo is able to supply unique technology compression-moulded diaphragms ensuring reliable parts. Tapflo diaphragms are of composite construction, superior for continuous heavy-duty service, with a completely smooth surface in contact with the liquid. This results in no leak through and a diaphragm which is easy to keep clean. The diaphragms are available in various materials and colours to suit any requirements:

  • PTFE TFM modified for solvents
  • EPDM
  • NBR
  • FKM

An advanced process of preforming, curing, trimming and finishing result in a long life composite diaphragm that will last for many millions of stroke cycles. All compounds are specially developed and optimised for composite diaphragm technology and compression moulding production. Components are chemically bonded by bonding agents and adhesives.

Tapflo Diaphragm Pump Range

Tapflo Air Operated Diaphragm Pump Range

What industries are Diaphragm Pumps used in?

Air Operated Diaphragm Pumps can be used for an array of applications and industries. Within our range, we cater for a large variety of applications including our Sanitary Diaphragm Pumps, ATEX rated AODDs, Powder Transfer Pumps and we also have a Low Energy Pump available for those businesses looking to reduce their energy costs and reduce their carbon footprint.

View the full Diaphragm Pump range

Industries that use Diaphragm Pumps within their operations:

  • Food and beverage
  • Chemical and petrochemical
  • Energy
  • Water treatment and surface treatment
  • Nuclear Pulp
  • Paper
  • Hygienic applications
  • Paint, print and varnish
  • Slurry and mud

For an in-depth overview of our Diaphragm Pump range, take a look at our Youtube video featuring Tapflo’s sales Executive Steve!

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

Contact the sales team today