Before determining the correct sprayer nozzle for your surface cleaner you must consider a few important facts about your equipment. The two most important factors in determining the correct sized nozzle are the flow and pressure of your equipment. The flow is measured in gallons per minute (GPM) and will decrease by half for every output your equipment can support. For example, a unit that has a 4 GPM flow rate and can support two nozzle cleaners will have a 2 GPM flow rate for each nozzle. On the other hand, the pressure of your equipment, which is measures in pounds per square inch (PSI), does not change regardless of the number of outputs your equipment can support. A 4000 PSI machine will produce 4000 PSI for each surface cleaner supported by your unit.
Most manufacturers provide a nozzle chart to match the correct nozzle with your equipment. For example, a unit that produces 4000 PSI with a flow rate of 4 GPM will need a 4.0 sprayer nozzle for the wand and 2.0 nozzles for each of the two nozzles in the surface cleaner. However, don’t make the common mistake of assuming that the GPM of each output is your nozzle size. A 3000 PSI pressure washer with a 5 GPM flow rate does not use a 5.0 nozzle for the wand. In fact this unit would require a nozzle size of 6.0 to work properly. That’s why it’s always so important to refer to the nozzle chart for your particular pressure washer model to ensure the correct size.
In addition to the size of the nozzle you must also take into consideration the angle of the nozzle as well. The most common angles used in surface cleaners are either a 15° or 25° nozzle, depending on your use. A lower angle of 15° for your sprayer nozzle will allow your surface cleaner to tackle the toughest jobs. Although the nozzle is angled, holding the wand at a 15° angle to the floor will also enhance the ability of the power washer.
Properly matching the right sized nozzle with your power washing equipment is crucial to the operation of your unit. An undersized nozzle will cause back pressure which could severely damage the pump of your unit. On the other hand, an oversized nozzle will not deliver the pressure required to complete the job effectively. Effectively matching these two pieces of equipment will ensure you can properly clean any surface and get the most out of your power washer.
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