Swirl Air® – Concentric In Line

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Swirl Air® – Concentric In Line


Liquid enters the nozzle axially, coming in contact with a tangentially introduced stream of air/gas or steam in the nozzle mixing chamber. The liquid impinges on the pintle plate and the interaction of gas and liquid creates extreme turbulence in the chamber. The swirling liquid, seeking an exit, impinges against the walls and distributor plate and then flows through the venturi-shaped orifice, where the droplets are exposed to extreme shear forces before impinging against a circular deflector ring and leaving the nozzle as a finely atomized spray cone. The deflector ring is held in position by a cone projecting from the distributor plate. This method eliminates struts that could interfere with the spray pattern. The progressive application of shear and inertial forces within the nozzle provide for a relatively high nozzle efficiency.


  • The nozzles have a two piece construction; the nozzle body, plus an integral deflector ring and cap that is easily removable without disturbing pipe connections.
  • There are no external struts or supports to interfere with spray patterns.
  • Standard configurations are available in 316L Stainless Steel and 440 Stainless Steel. Other materials such as Hastelloy C276 and Inconel 600 are available.


Air/Gas (or steam) is introduced tangentially into the nozzle chamber in low pressure region of the swirling liquid, creating extreme turbulence and primary atomization. As liquid leaves the orifice, it impinges against the deflector ring which serves a dual purpose; close control of spray angle and breakup of the spray into even finer droplets (secondary atomization). Eight sizes of nozzle are available covering flow rates from 1-2400 GPH. Nominal spray angles of 50°, 75° and 100° can be attained by the specification of interchangeable nozzle caps. Contact the factory for special spray angles from 25° up to 160°.The nozzle has demonstrated the capability of achieving mean droplet diameters in the 50-100 micron range at low air pressures and flows. When using dry steam instead of air, the steam pressure should be approximately four times greater than air pressure to achieve the same spray characteristics. Comparable atomization in a hydraulic nozzle would usually require very high pressures. Degree of atomization is also variable by controlling the volume ratio of air to liquid. As mentioned, droplet size may be changed by minor changes in air pressure. However, if air pressure is set initially, and it is necessary to modulate the liquid flow, the air differential pressure and flowrate will automatically respond in such a way that the quality of atomization remains nearly constant. In some applications, this can result in a saving through the elimination of air valving and controls.

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