Diaphragm Pumps

Diaphragm [Pumps]

Tapflo diaphragm pumps are some of the most versatile pumps on the market today. They can be used in a variety of installations in numerous applications. Thanks to the simple operating principle, with a compact and reliable design, Tapflo diaphragm pumps meet the demands of heavy industrial duties. Diaphragm pumps are also commonly known as membrane pumps.

Diaphragm Pumps

How Tapflo Diaphragm Pumps 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.

The Suction Cycle

Suction (lower part of the visualization)

One diaphragm creates a suction action when being pulled back from the housing.

Discharge (upper part of the visualization)

The other diaphragm simultaneously transmits the air pressure to the liquid in the housing, pushing it towards the discharge port.

During each cycle the air pressure on the back of the discharging diaphragm is equal to the head pressure on the liquid side. Tapflo diaphragm pumps can therefore be operated against a closed discharge valve with no adverse affect to the life of the diaphragms.

Key components of the Tapflo diaphragm pump

Three major components are especially vital for the function of the pump.

Long life diaphragms

The two diaphragms are doing the work to prime and push the liquid through the pump system. Tapflo diaphragms are of sandwich compound construction, superior for continuous heavy duty service.

The solution with an integrated metal core, provides a completely smooth surface in contact with the liquid, without any nuts or washers. This results in no leak through and a diaphragm which is easy to keep clean.

The diaphragm is available in PTFE (food grade), EPDM, white EPDM (food grade), NBR and FKM (FKM on certain models only).

Pollution free air valve

The air valve is the driving heart of the pump, distributing the compressed air to the chambers behind the diaphragms.

It is made for maintenance free duty with no lube air, thanks to the ingenious sealing system. It will not only save your money for lubrication, it will also save your environment from pollution. 

The Tapflo air valve has no deadlock position – the pump will always start automatically when air is supplied to the pump. The valve body is made from brass or optional stainless steel AISI 316.

Ball check valves

The Tapflo pump is fitted with four check valves, making sure that the liquid is transferred in the right direction through the pump. 

The valve is of ball valve type, the most simple and reliable valve design. It has a good sealing capability and is easy to keep clean and to replace if necessary.
The valve ball is available in EPDMNBR (nitrile), PTFE,AISI 316, polyurethane and ceramic to suit any kind of liquid.

Cutaway PTFE diaphragm

1) Reinforcement webbing    
2) Light metal core    
3) EPDM layer
4) PTFE layer

Diaphragm Pumps

  • Chemical industry

    Chemical industry The chemical industry is one of the biggest potential customers group of all mentioned. Chemical companies use a large number of pumps in their process. Diaphragm pumps are mainly used where portab...Read more»
  • Surface conditioning

    Surface conditioning Tapflo has served the surface treatment industry with pumps since more than 25 years. We have the knowledge of selecting the right pumps and filters for the different applications that are present ...Read more»
  • Paint, print & varnish industry

    Paint, print & varnish industry Tapflo has served the printing industry since 1985 with pumps and accessories for circulation, transfer, mixing and return, of ink, glue and solvents etc. We have the unique advantage of having our...Read more»
  • Hygienic application

    Hygienic application Transfer of food products like soup, cream, syrup, milk, yoghurt, flavours, spirit, chocolate, dough, creams, paste, perfumes and toothpaste. Service applications as spraying of cleaning liquid...Read more»
  • Water treatment

    Water treatment Pumping samples, dosing acids and alkalis for pH-control. Transfer of flocculent, suspensions, chemical reagents and sludges. The pumps are resistant to hydrochloric acid and ferric chlorite, plus ...Read more»
  • Pulp & paper industry

    Pulp & paper industry Transport of glue, sodium silicate, colour and titanium oxide etc. Bleaching products, sampling and waste water handling.Read more»
  • Mechanical industry

    Mechanical industry Handling of oil, fats, lubricants, cooling liquids, washing and cleaning liquids, solvents and waste products etc.Read more»
  • Biofuel

    Biofuel A biofuel is a fuel that contains energy from geologically recent carbon fixation. These fuels are produced from living organisms. Examples of this carbon fixation occur in plants and microalgae. T...Read more»

Items 17 to 27 of 27 total


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    T80 – 1"
    T80 and ATEX approved TX80 is a mid sized sanitary pump for various transfer, filling and emptying applications in food- and pharmaceutical industries. It measures 290×295×396 mm and has ...
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  • T800 – 3″

    T800 – 3″
    T800 and is our largest pump measuring 460 × 589 × 830 mm with a flow capacity of 820 liter/minute.
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  • T820 – 3"

    T820 – 3"
    T820/TX820 is a big sized pump available in aluminium and stainless steel AISI 316L. It has a max capacity of 820 l/min.
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  • Tapflo Pneumixer

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    The Pneumix was predominantly developed for the paint and ink industry where most raw materials in drums or containers settle out over time and need to be mixed or blended prior to use. T...
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  • TR20 – 3/8″

    TR20 – 3/8″
    The second smallest pump in our range, measuring only 105 × 112 × 168 mm but still very powerful with a flow of 20 liter/minute.
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  • TR9 – 1/4"

    TR9 – 1/4"
    TR9 and TXR9 (ATEX version) are the smallest in the range of PE & PTFE diaphragm pumps, measuring only 70 × 90 × 120 mm but still very powerful with a flow of 9 liter/minute. Ideal for...
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  • TX144

    Tapflo TX144 is a 2" Aseptic pump, designed for service in pharmaceutic-, biotech- and food industries where a clean process is the key. Max capacity is 144 l/min. Tapflo Aseptic series ...
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  • TX244

    Tapflo TX244 is a 2 1/2" Aseptic pump, designed for service in pharmaceutic-, biotech- and food industries where a clean process is the key. Max capacity is 330 l/min. Tapflo Aseptic ser...
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  • TX94

    Tapflo TX94 Aseptic series pumps are designed for service in pharmaceutic-, biotech- and food industries where a clean process is the key. Tapflo Aseptic series is EHEDG certified, has F...
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  • TXP220 XEES – 1 1/2"

    TXP220 XEES – 1 1/2"
    TXP220 is the smallest pump in our range of powder transfer pumps with a max capacity of approx 20 kg/min.
    Learn More»
  • TXP420 XEES – 2"

    TXP420 XEES – 2"
    TXP420 is the biggest pump in the range of powder transfer pumps with a max capacity of approx 30 kg/min
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