Which method is the preferred way to adjust Gallons Per Minute (GPM)?

The preferred method to adjust Gallons Per Minute (GPM) is by changing the nozzle orifice size. This approach directly affects the flow rate without altering the system pressure significantly. By changing the size of the nozzle orifice, you can either increase or decrease the GPM in a controlled manner. A larger orifice allows for more fluid to pass through, thereby increasing GPM, while a smaller orifice restricts flow, decreasing GPM.

Changing the nozzle orifice size is often favored because it allows for precise adjustments tailored to the specific application, ensuring efficient operation tailored to working conditions. This method also maintains consistent performance standards as nozzle designs are often tested for optimal flow characteristics, ensuring reliability in flow adjustments.

While other methods, such as changing pressure or replacing the nozzle, can also affect GPM, they may involve more extensive adjustments and considerations. Changing pressure can affect the system dynamics and may lead to unintended consequences elsewhere in the system. Replacing a nozzle might also require additional considerations, such as system compatibility or needing multiple nozzles for varying conditions. Calibrating by hand, while useful for fine-tuning, is less efficient for consistently managing GPM in response to changes in demand.