Spray Nozzle Chart: Volume (GPM) at Various Pressures (PSI)
For a tiny piece of equipment, a spray nozzle is often the most crucial aspect of a liquid application system, whether it’s on a pressure washer or a boom sprayer; the nozzle dictates the volume and ultimately the performance of the entire machine.
One of the primary aspects of sprayer nozzles is the size or the flow rate of a nozzle. There is an international standard for nozzles, dictates, nozzle size, and ensures consistency across different manufacturers and brands.
Spray Nozzle Size Chart
We can use this spray nozzle size chart to determine the liquid flow rate in gallons per minute at various pressures for each nozzle size. This is how we determine the proper nozzle size for your application.
Spray Nozzle Size
Spray nozzle size refers to the orifice size—the opening that the liquid flows through. This size directly affects how many gallons per minute (GPM) a nozzle will deliver at a given pressure (PSI). The sizing is standardized across manufacturers, meaning a nozzle labeled as “6” (typically shown on a nozzle as 06) from one brand will have the same flow characteristics as a “6” from another, assuming they are the same nozzle type.
Each nozzle size has a corresponding orifice diameter and a known flow rate at various pressures, which is what the chart helps you determine.
How to Use the Spray Nozzle Size Chart
The chart you see above lets you find the flow rate in gallons per minute (GPM) based on two key factors:
Nozzle Size (found in the left-most column)
Operating Pressure (found along the top row)
Each cell in the chart tells you how much liquid will be sprayed at a given pressure for a specific nozzle size.
Step-by-Step Example:
Let’s say you are using a Nozzle Size 6 and spraying at 600 PSI.
First, locate Nozzle Size 6 on the left side of the chart.
Then, move across to the 600 PSI column.
You'll find the flow rate listed as 2.3 GPM.
This means your nozzle will output 2.3 gallons of liquid per minute when operated at 600 PSI.
This chart is useful across all industries as long as you are using a flat fan or solid stream sprayer nozzle. We must know two different pieces of information to make this useful for us: your operating pressure and the nozzle size that you are using. It does not matter what spray angle the nozzle produces; only the orifice size.
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Call Us for Help!
If you want help finding the right spray nozzle, give us a call. We can help farmers size nozzles for sprayers, size high-pressure tips for power washing, and determine nozzles that will provide adequate flow for industrial processes.
