What are the characteristics of pneumatic nozzles
Pneumatic nozzles or fan atomizing nozzles are two-fluids nozzles. They use a high-velocity flow of compressed air that gives them different features compared to the hydraulic nozzles. Most of the time, the air is used to break down the water in very small particles, even smaller ones than what hydraulic nozzles produce. They can spray very small droplets down to 7 µm and can reach substantial sizes depending on the model.
Characteristics
- Two-fluids
- High velocity flow
- Very small particles
- Large turn-down ratio
Droplet size of pneumatic nozzles
For the compressed-air driven nozzles, depending on the model of selected nozzle, the droplet size differs between being smaller than 100 µm and reaching a size up to 1000 µm. To make things more accessible, the dimensions of the droplet size have been divided in different fog nozzle sub-categories, based on the spraying capacity, such as: small capacity fine fog, medium capacity fine fog, semi-fine fog. The compressed-air driven nozzles also include a special sub-division called clog-resistant nozzles. They are manufactured from wear-resistant and chemical-resistant materials and their unique design minimalizes the risk of clogging.
In the case of the blower-air driven nozzles, the minimum mean droplet size can vary between 40-80 µm and the maximum would be between 100-180 µm, depending on the selected model. These nozzles are known to provide a spraying pattern of either a fine or semi-fine type of fog, while running on an ultra-low pressure.
The special pneumatic nozzles, have a higher droplet size, due to their similarity to the steam-driven pneumatic nozzles. Thus, the droplet size is alternating with a low of 400-430 µm and a high between 488-550 µm. The nozzles included within this category are either a hybrid (hydraulic/pneumatic nozzle) or a steam-driven nozzle.
Suitable applications
Each model can be suitable for a different type of application or industry. However, based on a general overview, our pneumatic nozzle applications fit in situations that:
- High pressure cleaning
- Spraying water or chemicals
- Cooling and moisturization
- Paper or metal trimming
Before considering the application of the nozzle, there are other aspects that must be taken into account in order to ensure that the nozzle will be optimal for that specific need. These criteria can be distinguished based upon the flow rate, volume and the liquid pressures.
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