Air Atomizing Nozzles

Air atomizing nozzles are available in various designs to comply with specific spray and flow requirements:

  • self-aspiration (siphon principle)
  • supply of liquid from a vessel located at a higher level (gravity principle)
  • supply of liquid under pressure (pressure principle)
  • mixing of fluids inside or outside the nozzle
  • full cone or flat fan spray pattern

→ Functional video full cone 

Overview: all pneumatic atomizing nozzles (pdf, 1.29 MB)

Criteria for Selecting Pneumatic Atomizing Nozzles

1. Spray Pattern

Pneumatic flat fan atomizing nozzles are appropriate for humidifying and cooling of product, for web dampening, or for whenever a broad linear coverage is required (such as applying paint or food toppings). Pneumatic full cone atomizing nozzles are appropriate when circular impact or coverage is required (such as for fluid injection into a duct or pipe).

2. Liquid Supply Source

Whenever liquid can be supplied under pressure, it is most appropriate to use nozzles which function by the liquid pressure principle. Use of pneumatic atomizing nozzles operating by the siphon or gravity principle is more appropriate when liquid is to be sprayed in very low quantities (such as spraying disinfectants) and little pressure is required.

3. Internal vs. External Mix

In pneumatic nozzles, the supply of air or gas mixes with the liquid flow, breaking up the fluid into the smallest droplet particles, either inside (internal mix) or outside (external mix) the nozzle chamber. An internal mix nozzle is appropriate when water, low viscosity liquids, or liquids without solid matter are to be atomized. An external mix nozzle is more appropriate for atomizing viscous liquids which might otherwise tend to clog the nozzle. Low liquid pressures should be used with this type of nozzle due to its design.

4. Style of Nozzle

Series 136 nozzles (AirMists) are most appropriate when there is a need to finely atomize low viscous fluids, such as water. These are also able to have any of the various attachments on page 53 applied to them. This includes the pneumatic valve, which can separately and remotely control on-off operations, especially when intermittent spraying is required. Series 176 nozzles (ViscoMists) are external mix nozzles only and are most appropriate for spraying more viscous fluids (such as syrups and heavy oils) than AirMists are designed for. Series 166 AirMists include a solenoid for electronic activation of the nozzle through operation of a needle valve. This could be more appropriate if metered air is limited.

Types of Pneumatic Atomizing Nozzles

Pneumatic full cone atomizing nozzles

Pneumatic full cone atomizing nozzles, however, should be used, when a compact, circular impact or a major reach is required, e.g. for direct air humidifying, for gas cooling or for chemical process applications.

Pneumatic full cone atomizing nozzles

Pneumatic flat fan atomizing nozzles

Pneumatic flat fan atomizing nozzles produce a flat spray pattern with extremely fine droplets and spray angles up to 80°. These nozzles are particularly suited for applications requiring fine droplets and a wide linear impact.

Pneumatic flat fan atomizing nozzles

Versatile pneumatic atomizing nozzles

Series 176 ViscoMist allows the separate control of atomizing and air.

Versatile pneumatic atomizing nozzles

Accessories for Series 136 pneumatic atomizing nozzles

The pneumatic atomizing nozzles can be adapted to special requirements and requirements by accessories.

Accessories for Series 136 pneumatic nozzles

Twin fluid

Efficient atomization by mixing liquid and gas. 

Twin fluid


Lechler, Inc. Phone (800) 777-2926 Fax (630) 377-6657 info(at)