Fundamental Study on Pest Control Systems by High Pressure Type Sprinkler in the Orchard (2)

A Pipeline Method to automate and uniform Spraying

Abstract

1) A pipeline method was considered to automate the pest control systems in the sloping orchard and to make the spraying pressure of each sprinkler uniform. To grasp the operation of the system, fundamental experiments were done. When liquid pressure at the pilot valve was maintained within the set pressure range by increasing pump pressure, the water pressure valve installed at the sprinkler lateral was opened by the hydraulic signal from the pilot valve. It was confirmed that this method had a possibility for uniform spraying, but at the flow changing time the pump pressure decreased considerably, and so improvement of the pressure control valve might be necessary.
2. This pipeline method applied to a sloping orchard was simulated by a digital computer and the suitable pipe diameters and lengths were obtained for each of the set pressure. In case that such pipes were chosen, the k, S values of the pilot valve were calculated.
3) The spraying pressures of the sprinklers installed at the laterals should be as uniform as possible at the minimum pipe cost.
Five pipeline types were considered and the spraying pressures of ten sprinklers, their mean and standard deviation of each type were calculated. However, in this calculation model these net work pipeline methods were not so economical in comparison to the usual method.