Metal series diaphragm Pumps

The compact, smooth and simple design is common for this series. Materials available are aluminium, cast iron, stainless steel and PTFE coated aluminium. You will discover the ingenious simplicity when you maintain the pump. We use approximately 70% fewer parts than our competitors use to build similar sized pumps.

Aluminium and cast iron pumps

For transfer of pH-neutral fluids, both thin, thick, solid laden or abrasive. The aluminium and cast iron pumps are found in most fields; work shop and paint industries, purifying plants etc., to mention only a few.

AISI 316 stainless steel pumps

Made in lost wax cast method, ensuring great accuracy and finish. The stainless steel pumps combine great mechanical strength with good chemical features. AISI 316 is resistant to aggressive liquids like nitric acid and sodium hydroxide. The centre unit, which is not in contact with liquid, is made from corrosive resistant polypropylene (PP) as standard (other materials upon request).

ATEX certified pumps

All metal pumps are available in explosion proof ATEX marked version. They are supplied with earth connection and conductive materials; conductive centre section (on AISI 316 pump), diaphragms in PTFE (conductive back) or EPDM (conductive).


Metal series diaphragm Pumps


1. Flexible installations

The connections may be rotated 180°. Simply turn the connections to fit your piping system. Threaded BSP orNPT connections is standard. Twin connections are also available.

2. Powerful valveseats

The valve seat is under constant stress from the movement of the valve ball. To obtain the best wear resistant, the integrated seat is made from AISI 316 stainless steel.

3. Low air consumption

The air distribution system is designed with shortest possible air distribution ways. This eliminates ”dead spaces”, resulting in high effiencey and low air consumption.

Metal series diaphragm Pumps

Metal drum pumps


The Tapflo drum pump is ideal for mobile use and is available in aluminium or stainless steel AISI 316.

It is fit with an ergonomic designed handle in stainless steel AISI 316L. The drum tube is delivered in any length up to 2 m.

The Tapflo diaphragm drum pump has many advantages compared with conventional drum pumps as stated above.

Metal drum pump range
Size Capacity (l/min   –   gallon)
*TXD25  25 lit/min    –     1/2”
TXD70 70 lit/min    -    3/4”
TXD120 120 lit/min    –     1”

*TXD25 is available in aluminium only

Metal twin pumps

Tapflo Metal series pumps may be fitted with double in/outlet to achieve ”two pumps in 
one” for blending, mixing or recirculation of liquids. The liquid in one pump chamber is separated from the other one.

Twin pump installation for printing application - transfer and cir-culation of printing ink

PTFE coated pumps

Aluminium pump include all wetted parts coated with non stick PTFE, is equipped with stainless steel in/outlet ports.

The model was developed for the printing industry where a low price alternative of the PE/PTFE pumps was required but aluminium not chemically resistant. It can be used for all sorts of applications where slightly acidous or alkaline liquids need to be transferred. 

However, in applications with highly aggressive chemicals, we still recommend our full plastic PE & PTFE series pumps.

Metal series diaphragm Pumps


The performance curves are based on water at 20°C. Other circumstances might change the performance. See below how the capacity will change at different viscosities and suction lifts. These curves are valid for all metal pumps.

Example (see the red line): A flow of 10 liter/minute is desired. The discharge head is calculated to 20 mWC. We choose a T25. It requires an air pressure of 4 bar and will consume approximately 0.10 Nm3 air per minute.

Metal series diaphragm Pumps


Dimensions in mm Dimensions in inch (where other is not indicated)


Metal series diaphragm Pumps

Technical data

Metal series diaphragm Pumps

Pump code

Metal series 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»

6 Item(s)

  • 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 ...
    Learn More»
  • 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.
    Learn More»
  • 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.
    Learn More»
  • 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»
  • T70 – 3/4"

    T70 – 3/4"
    T70 and ATEX approved TX70 is a mid sized pump available in aluminium cast iron and stainless steel AISI 316L. With the compact dimensions 150×168×229 it has an impressive max capacity of...
    Learn More»
  • 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.
    Learn More»
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