HDPE & PTFE Diaphragm Pumps

HDPE/PTFE Air Operated Double Diaphragm Pumps

Tapflo manufacture and supply their Air Operated Diaphragm Pumps in both solid block polyethylene (PE) and virgin PTFE plastics. These materials can be used to handle almost any liquid substance, including those which are viscous, contain solids or even the most chemically aggressive such as concentrated nitric acid. Thanks to their modular design, these units can also be easily converted into the many different variants we have on offer to ensure that you are being supplied with the most suitable and reliable pump for your requirements.

The pump has been innovatively designed with up to 70% fewer parts than other Diaphragm Pumps on the market. Fewer components mean a pump which is compact as well as easy & quick to maintain. The result is lower service costs and process downtime.

Typical Applications of a HDPE/PTFE Diaphragm Pump

The Tapflo HDPE/PTFE Air Operated Double Diaphragm Pumps are ideally suited to a plethora of applications in numerous industries, such as:

Industry Application
Chemical Acids, alkalis, alcohol, solvents, latex & emulsions
Food CIP fluid, flavouring & pigments
Pulp & Paper Glue, slurries, adhesives, dispersions, resins, sodium silicate & titanium oxide
Surface Conditioning Electroplating baths, various acids, solvents, anodic sludge, varnish & enamels
Water Treatment Sludge handling, filter press applications, neutralization & flocculants
Electronics Carrier fluids, ultra-pure liquids, electroplating solutions, mercury & solvents

HDPE Diaphragm Pumps

Tapflo have standardised to Solid Block Polyethylene (PE HD) instead of moulded PP (Polypropylene), which is commonly used amongst other Diaphragm Pump manufacturers on the market. There are couple of reasons for this: PE has a superior wear resistance (6 to 7 times better) to PP. This fact makes the pump perfectly suitable for handling abrasive slurries and preferred to Stainless Steel in these applications. Tapflo also uses different grades of PE depending on the part to ensure the best mechanical and abrasion resistance.

For instance, valve seats and ball stoppers, which are the most vulnerable parts to wear, Tapflo use UHMW PE1000 which has even greater resistance to abrasion and mechanical stress. PE is also resistant to most kinds of aggressive chemicals such as concentrated acids and alkalis. Making it an ideal material for chemical handling as well. PP is instead used as material for the centre blocks, again machined from solid block instead of moulded.

PTFE Diaphragm Pumps

Tapflo offers virgin solid block PTFE as an alternative to PE as it offers superior chemical and temperature resistance. PTFE will handle even the most aggressive of acids, such as concentrated Nitric Acid and handles temperatures up to 100ºC instead of 70ºC for PE.


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  1. ATEX HDPE & PTFE Diaphragm Pump

    Tapflo’s ATEX HDPE & PTFE Diaphragm Pump is manufactured from solid block conductive (Carbon filled) plastic meaning it can be supplied for use within equipment group IIG (gas), Cat 2 (Zone 1).

    The conductive material ensures that no electrostatic loads will accumulate within the pump and the conductive pigments in the material reduce the surface resistance to less than 105 W, these pigments are what cause the black colouring.

    The colouring does not affect the chemical resistance of the thermoplastics. Diaphragms supplied can be PTFE with conductive back or EPDM which is conductive. The pump has an earth connection which earths electrostatic loads. This ATEX range is available across the full-size range of Tapflo HDPE & PTFE pumps.

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  2. Barrier Diaphragm Pump (HDPE & PTFE)

    Tapflo’s TB Barrier Diaphragm Pump has been designed with an additional set of diaphragms used to support the primary diaphragms. It is the perfect solution for when a diaphragm rupture has to be detected immediately in order to avoid the product leaking into the environment and the air distribution system.

    When a rupture is detected the pump is automatically stopped and an alarm can be generated to alert you to the issue.

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  3. Twin Diaphragm Pump (HDPE/PTFE)

    Tapflo's TT Twin Pumps (HDPE & PTFE) may be fitted with multiple porting configurations to achieve up to 2 pumps in 1 for blending, mixing or recirculation applications and therefore simplifying pipework configurations and the system in general! In the example shown, the TT Twin HDPE/PTFE Pump are fitted with twin inlet and outlet ports. Effectively enabling 2 pumps in one. 

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