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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