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

  • 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 1 to 16 of 28 total


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  • Pneumatic diaphragm alarm unit

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  • Pneumatic level control system

    Pneumatic level control system
    This ingenious system is operated with pneumatic components only. The level control system may be installed in sumps, tanks or tubs to start and stop the pump at certain liquid levels. Th...
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  • T100 – 1″

    T100 – 1″
    T100 and ATEX approved TX100 are powerful middle sized pumps measuring only 200 × 214 × 320 mm with a flow of 125 liter/minute.
    Learn More»
  • T120 – 1"

    T120 – 1"
    T120 and ATEX approved TX120 is a mid sized pump available in aluminium cast iron and stainless steel AISI 316L. With the compact dimensions 200×195×302 it has an impressive max capacity ...
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  • T125 – 1 1/2"

    T125 – 1 1/2"
    T125 and ATEX approved TX125 is a mid sized sanitary pump for various transfer, filling and emptying applications in food- and pharmaceutical industries. It measures 290×320×445 mm and ha...
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  • T200 – 1 1/2″

    T200 – 1 1/2″
    T200 and ATEX approved TX200 are some of our larger pumps measuring 270 × 310 × 450 mm with an impressive max flow of 330 liter/minute.
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  • T220 – 1 1/2"

    T220 – 1 1/2"
    T220 and ATEX approved TX220 is a big sized pump available in aluminium cast iron and stainless steel AISI 316L. It measures 270×265×412 mm and has a max capacity of 330 l/min.
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  • T225 – 2"

    T225 – 2"
    T225 and ATEX approved TX225 is the second biggest in the range of sanitary pumps for various transfer, filling and emptying applications in food- and pharmaceutical industries. It measur...
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  • T25 – 1/2"

    T25 – 1/2"
    Compact and small diaphragm pump (105×116×160 mm) in aluminium and cast iron, ideal for installation where it is little space.
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  • T30 – 1"

    T30 – 1"
    T30 and ATEX approved TX30 is our smallest pump in the sanitary pump range, ideal for filling and dosing applications in mainly food- and pharmaceutical industries. It measures 160×230×30...
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  • T400 – 2″

    T400 – 2″
    T400 and ATEX approved TX400 are our second largest pumps measuring 350 × 380 × 563 mm with a flow capacity of 570 liter/minute.
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  • T420 – 2"

    T420 – 2"
    T420 and ATEX approved TX420 is a big sized pump available in aluminium, cast iron and stainless steel AISI 316L. It measures 350×342×537 mm and has a max capacity of 570 l/min.
    Learn More»
  • T425 – 2 1/2"

    T425 – 2 1/2"
    T425 and ATEX approved TX425 is the biggest in the range of sanitary pumps for various transfer, filling and emptying applications in food- and pharmaceutical industries. It measures 440×...
    Learn More»
  • T50 and TX50 – 1/2″

    T50 and TX50 – 1/2″
    A powerful middle sized diaphragm pump measuring only 150 × 160 × 243 mm with a flow of up to 60 liter/minute.
    Learn More»
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