Why is it important to check nozzle flow rate after initial calibration?

• A. Flow rate could change due to age and nozzle variation
• B. Flow rate is constant over time
• C. Not necessary after calibration
• D. Flow rate always doubles over time

Answer: (A)

Spray systems are calibrated to deliver a specific volume at a given pressure, so keeping that flow steady is essential for accurate application. Nozzle flow can drift as nozzles age and wear, or because different tips—even of the same type—have slight variations. Deposits, chemical compatibility, and changes in temperature or pressure can also alter flow. Because of these factors, the actual spray rate after initial calibration may differ from the target. Rechecking ensures you’re still delivering the labeled rate and maintaining uniform coverage. If you find a mismatch, you would adjust the pressure, replace the nozzle, or re-calibrate to restore the correct flow.