Fan Spray Pattern

Fan nozzles produce a thin, flat sheet of liquid that widens as it moves outward from the nozzle. As the spray meets a surface, a thin contact line of liquid is produced. Since the liquid is concentrated into a smaller area, the impact produced by a fan nozzle is generally greater than that of a full or hollow cone nozzle.

Many different nozzles series produce a flat fan spray pattern. The following direct pressure nozzles produce a flat fan spray pattern:

Some of BETE’s nozzles use compressed gas to produce very fine mists and generate a variety of spray patterns. The following BETE Air Atomizing nozzles create a Fan spray pattern:

BETE also offers a flat fan nozzle for spraying gas as the working fluid. The nozzle is listed as follows:

How is this spray pattern achieved through nozzle design?

BETE’s large selection of fan nozzles generate their flat fan spray patterns in a variety of ways.

Hhydraulic nozzles generally use two different methods of generating the flat fan pattern.

  • Nozzles like the NF and BJ series manipulate the orifice by cutting a slit into the nozzle that guides the flow into a specific spray pattern. The spray angle of these slitted nozzles is determined both by the angle of the cut and the depth of the cut. The deeper and more narrow the cut, the wider the spray angle.
  • Nozzles like the FF and SPN series use a deflection face to guide and form the fan pattern. The orifice passes the fluid, and a sloping face directs and generates the pattern. A longer and more narrow deflection face will produce a more narrow spray angle where a wider and short face will produce a wider pattern.

Air atomized nozzles utilize fluid and air caps to generate their pattern.

  • For internally-mixed air atomizing nozzles, the two fluids come together in a chamber between the fluid cap and air cap. That mixture is then propelled out through the air cap orifice. These orifices use similar methods of creating the flat fan pattern as the above described hydraulic nozzles, either by slit or deflection face design.
  • For externally-mixed air atomizing nozzles, the liquid is expelled to the atmosphere where the air is then added. The air streams are directed in a way that facilitates the liquid droplets into a fan pattern.

Operating Specifications & Frequently Asked Questions for Fan Nozzles

Most flat fan nozzles are able to achieve a wide variety of spray angles. BETE’s flat fan nozzles usually produce a spray angle from 120° to 0° with a multitude of options in between. Some special extra-wide flat fan nozzles like the FF series can produce angles as wide as 145°.

Fan nozzles usually produce medium to coarse atomization.

  • Fan nozzles are able to be operated with a very wide range of pressures. All fan nozzles have different purposes, but in general the fan nozzles listed above can operate on a pressure range of 5 psi - 400 psi.
  • The NFH and BJH nozzle series are designed with a tungsten carbide tip and can operate between 100 psi - 5000 psi.
  • Fan nozzles are one of the most versatile nozzles types and can be implemented in countless different applications. Depending on the nozzle and flow rate that the application demands, flat fan nozzles can provide over 500 GPM and can produce flow rates as low as .024 GPM if necessary.

  • Flat fan nozzles are often times the most advantageous choice for conveyor belt applications. Whenever something is moving and has to be washed, wetted, or coated, fan nozzles are often your best choice. Examples of this are conveyor belt cleaning, suppressing coal dust on a conveyor and coating molds with lubrication.
  • When a high impact force is necessary for either cleaning or other applications, a Fan style nozzle may be your most advantageous choice. The SPN series and narrow angled NF nozzles will provide a large impact force while producing relatively low flow rates.