Diaphragm pumps


Tapflo diaphragm pumps are some of the most versatile pumps on the market today. They can be used in 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.


Features & benefits


Run dry without damage

easy to use, no need of guarding device

Infinitely variable flow control

flexible and easy to adjust

Self priming up to 5 m from dry suction pipe

more options of installation

No electricity needed

explosion proof versions Ex-zone 1 available (ATEX group II, cat 2)

Few components

low down time and maintenance costs

Solid, strong and long life design

low maintenance costs

Lubrication free air distribution system

Saves the environment from pollution

Air operated

can run against a closed pipe or closed valve without damage. Easy to install without special training (no electricity)


Working principle

working principle.enThe Suction Cycle

  • Suction (1)
    One diaphragm creates a suction action when being pulled back from the housing.
  • Discharge (2)
    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

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


Long life diaphragms


diaphragm-cross-section.en 1

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.

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


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 EPDM, NBR (nitrile), PTFE, AISI 316, polyurethane and ceramic to suit any kind of liquid.



water treatment
paint, print and varnish