This project details the dynamic performance of two commercially available hydraulic flow-control valves, DC motor driven and proportional solenoid type that are currently available for use on the variable-rate granular spinner-disc fertilizer spreader used in the citrus groves of Florida. The dynamic behavior of these valves was modeled as a first-order lag plus dead time response. The experimental data were collected by issuing the valves a series of fixed step open commands and by monitoring the steady-state flowrate output of the valves. Both valves were subjected to similar flowrate change commands and the outputs from the valves were measured. The valve delay times (tau) were 0.08 s and 0.04 s and the first-order time constants (T) were 0.09 sand 0.02 s for the DC motor driven and proportional solenoid valve respectively. It was concluded that the proportional solenoid valve's performance was better.
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