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Air Operated Diaphragm Pump Installation

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    Types of Installations

    The Tapflo Air-Operated Double Diaphragm Pump is flexible to many types of installations. Furthermore, as the inlet and outlet ports can be rotated through 180º piping systems can also be simplified, reducing the work of the pump and the installer! Below are 3 types of installations which Tapflo Air Operated Diaphragm Pumps can be operated in:


    The piping system is designed so that the pump is fed with a positive suction head. This is the best way to install a pump when it is necessary to completely empty all the liquid from the suction tank or container, or where viscous products are being transferred. Note: Do not exceed 0.7 bar suction pressure as higher pressures than this may cause premature diaphragm failure and irregular pump operation such as siphoning.Diaphragm Pump Flooded Installation


    All Tapflo Air Operated Diaphragm Pumps can be submerged into the liquid and can act as a pneumatic submersible pump. It is important to ensure that all the components in contact with the fluid are chemically compatible. The air exhaust must also be fed to the atmosphere by means of a hose or “snorkel” so the pump can “breath”.Diaphragm Pump submerged installation


    A Diaphragm Pump can be placed with dip tube into a tank and pull a high vacuum without causing damage to the pump. Tapflo Diaphragm Pumps can self-prime up to 5m from an empty suction pipe or 8 meters from a wetted pipe.Self-Priming Diaphragm Pump Installation

    Installation Example

    Below is an installation example showing “best practice” when installing a Tapflo Air Operated Diaphragm Pump. Our air valves are constructed for oil-free air. Lubricated air is not permitted and will damage the pump. However, if the air is very dry (laboratory air), the air may be lubricated with water. The maximum allowed air pressure is 8 bar, and as a preventative measure, the air must be filtered to at least 5 microns or less. Recommended air quality according to PN-ISO8573-1:2010 is particles class 6, water class 7 and oil class 4.

    To facilitate the operation of the pump, and cater for the above parameters, we recommend an air treatment system connected to the air supply.

    These components should be included:

    1. Regulator to adjust the air pressure and therefore the discharge pressure generated by the pump.
    2. Manometer to read the output pressure to the pump
    3. Needle valve to adjust the airflow to the pump and therefore the flow rate generated by the pump. This is especially useful when operating the pump in the lower ranges of its performance capabilities and for accurate control of flow rate.
    4. Filter to ensure that the pumps air valve doesn’t become contaminated.

    These components are included in Tapflo’s Air treatment system which can be ordered from us and installed onto the pump so that it is ready to use upon delivery.

    1. Gate valve for isolating compressed air supply
    2. Air Filter and Pressure Regulator w/ mounted Manometer
    3. Flexible Air Hose feeding to the pump Air Inlet
    4. Needle Valve for regulating the pump’s flow rate
    5. Flexible Suction Hose feeding to pump suction side to absorb any vibrations and water hammer effects.
    6. Gate Valve fitted to the pump suction to enable insolation for maintenance.
    7. Gate Valve fitted to the pump discharge to enable insolation for maintenance.
    8. Coiled flexible piping fitted to the pump discharge to provide back pressure and also the required distance between the pump and flow gauge/meter to retain accuracy.
    9. Flow gauge to provide an accurate readout of generated flow to ensure that the pump is working comfortably.

    NOTE: Isolation valves can be fitted to the pump ports by means of unions and flexible hose attached to fluid components by means of hose tails and hose clamps/jubilee clips.

    in Installation, Troubleshooting and Maintenance
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