Air Atomising spray nozzles

Air Atomising spray nozzles, sometimes known as dual flow nozzles, use compressed air or other gases mix with a liquid to create fine spray atomisation.

The droplets created range from 10/15 micron to 300/400 micron depending upon the size of orifice, liquid flow rate and air volume and pressure.

This is achieved by the combination of a specific fluid cap and air cap fitted onto a manual or automatic spray body and are interchangeable.


These are varied and include any requirement where a very fine spray is required.

The type of spray can vary from an almost dry mist to a fine spray of a viscous material.

Typical Applications:

  • Lubrication
  • Coating
  • Mixing
  • Humidification
  • Dust control
  • Odour control
  • Automatic control of hydraulic spray tips

Virtually all process and manufacturing industries can benefit from this type of spray atomisation and IC Spray Ltd's engineers are available to discuss your requirements.

Spray results and controls

The results achieved all depend upon the air pressure / volume, liquid pressure /volume and the nature (viscosity) of the liquid to be sprayed.

It is possible to regulate the inlet liquid flow, pressure and mixing gas in order to have the desired spray.

With the increase of the air pressure, the droplets size reduces creating a finer spray and conversely the decrease in air pressure, (a larger liquid flow), larger droplets are created.

So if the air pressure is changed; the flow, droplet size (atomisation), the spray angle (within limits) and the spray distance are also changed.

Body types and set ups

All spray sets ups can be used with the different body configurations.

The E series is an effective and economical solution in providing a fine spray atomisation. Options include manual liquid flow regulation and orifice clean where particle contamination may cause blockages.

The PA automatic guns are assembled with all the spray set ups listed in the catalogue and permit the on-off control of the liquid feed, through an internal air cylinder which can operate at over 100 cycles per minute.

The PA series feature 2 inlets Ø 1/4” (F) BSP for both the air and liquid feeds and 2 connections Ø 1/8” (F) BSP connections for the on-off air cylinder operation.

In addition standard spray tips can be combined with the PA range for greater control of the spray operation.

There are 2 main methods of air pressure atomisation, with a third being the use of a syphon set up.

Internal Mix

The liquid and gas are combined internally within the body of the nozzle and exit through one orifice to provide the finest atomisation.

The air and liquid are directly related to each other and a change of air pressure will affect the liquid flow. In addition the internal mix is usually not suitable for spraying liquids of over 200 centipoise.

Choice of spray patterns available:

  • Full cone
  • Hollow cone
  • Flat spray

External Mix

The liquid and gas are combined externally. As there is no connection between the inlet lines of the air and liquid a finer degree of control can be achieved. This system benefits the spraying of viscous liquids over 200 centipoise. The down side is the atomisation is not as fine as the internal mix spray set up.

Choice of spray patterns available:

  • Full cone
  • Flat spray

Syphon Fed

This negates the need of liquid pumps and depends solely upon the compressed air pressure / flow to draw the liquid into the mixing chamber. Again liquids with a viscosity of over 200 centipoise are not suitable for the this type of spray process.

Choice of spray patterns available:

  • Full cone
  • Flat spray

With these spray body options and variations in air and fluid caps, the resulting atomisation produced can vary from a "dry" mist to a an effective wet spray mist.