Tag: spray nozzles

At EXAIR we are primarily known for our compressed air products. However, we do have an extensive line of liquid spray nozzles.  These liquid nozzles fall into two main categories – Air Atomizing and Liquid Only Nozzles. We can further divide the Air Atomizing Nozzles into three more categories: Siphon Fed, External Mix, and Internal Mix. The Siphon Fed Nozzles are going to be the focus of this blog.

It is very common in spraying applications for the liquid to be pressurized. When that isn’t possible, our Siphon-fed nozzles are a great option. This type of nozzle pulls the liquid into the nozzle by creating a vacuum. This vacuum is created thanks to the special design of the air cap. As air flows through the air cap, it creates low pressure on the liquid side due to a venturi effect. These Atomizing Nozzles are capable of drawing liquid from a suction height of 36″ (91 cm) or can be fed by gravity from heights of 18″ (46 cm) or more.

Manufactured out of 303-type stainless steel for durability and corrosion resistance, the Siphon Fed Nozzle comes in three different body sizes: 1/8 NPT, 1/4 NPT, and 1/2 NPT. This will allow for a wide range of possible application flow rates. The maximum liquid flow rate for each body size is managed by the air and liquid cap. These caps can be swapped out easily for each body size, allowing you to change the spray patterns, manage the fluid delivery rate, and minimize downtime when cleaning is needed. You can easily tweak the amount of liquid applied by adjusting the siphon height / or gravity feed height, inlet pressure, and the liquid adjusting valve stem. This way, you can fine-tune the exact fluid amount needed for your process, helping to avoid any waste.

If you would like to reduce waste even further, we also have our No-Drip option. EXAIR’s patented design helps prevent the liquid from leaking out of the Atomizing Nozzles when the compressed air supply is shut off; hence the name No-Drip! When the compressed air is switched off, a valve within the body seals off the liquid side. This is especially useful for sensitive applications, where the No-Drip feature will stop drips that might spoil the finish of your product when not activated.

If you’re looking for a solution to your liquid spray application, but want to avoid liquid pumps or pressure pots, the Siphon Fed Atomizing Nozzle may be right for you. If you would like to discuss your liquid spraying application, I’d be happy to discuss the application with you and make a reasonable recommendation backed up by our 30-Day guarantee.

Al Wooffitt
Application Engineer

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EXAIR Atomizing Spray Nozzles use compressed air to atomize liquid flow. Across the product line, we offer a wide range of liquid flow rates. Model SF8010SS Siphon Fed Flat Fan Pattern 1/8 NPT Atomizing Spray Nozzle can get as low as 0.14 gallons per hour. That’s about a quarter of an ounce – a little less than two teaspoons – per minute. On the other end of the spectrum, Model EF5010SS External Mix Narrow Angle Flat Fan Pattern 1/2 NPT Atomizing Spray Nozzle can provide up to 303 gallons per hour of liquid flow (we tested with water; if you’re spraying something else – especially if the viscosity or specific gravity is different – your mileage may vary.) That’s about 5 gallons per minute, or approximately twice the amount of flow from a typical kitchen faucet.

Both of those Atomizing Spray Nozzles create flat fan patterns:

Flat Fan Pattern Atomizing Spray Nozzles can generate flat fans as narrow as 3″ (at a distance of 6″ from the spray tip) or as wide as 68″ (at a distance of 15″ from the spray tip.) They’re available for Internal Mix, External Mix, or Siphon Fed operation. Most of them spray straight out from the Air Cap, as shown above, but Model AD1010SS (right) has a Deflected Fan Pattern, so it sprays at a right angle to the Spray Nozzle’s orientation. They’re particularly well-suited for installation in tight spaces or anywhere that space is at a premium.

Other applications call for round patterns. These are great for dust mitigation, humidification, applying paint or lubrication, light misting, or heavy soaking, just to name a few. They can make round patterns with diameters as small as 1.5″ (at a distance of 6″ from the spray tip) to 31″ (at a distance of 15″ from the spray tip.)

EXAIR also makes 360° Hollow Circular Pattern Atomizing Spray Nozzles. These are Internal Mix models, and they spray the liquid out in a fine, atomized mist in all directions. They can spray as little as 1.6 gallons per hour, or as much as 150 gallons per hour, and can create spraying diameters of up to 13 feet.

If you need a consistent, reliable mist of atomized liquid, we’ve got you covered. To discuss an application or product selection, give me a call.

Russ Bowman, CCASS

Application Engineer
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