Large Power-Driven Sprayers (high pressure)
These sprayers are used to spray through dense foliage, thick animal hair, to the tops of tall trees, and into other areas where high-pressure sprays are necessary for adequate penetration and reach. Often called "hydraulic" sprayers, they are equipped to deliver large volumes of spray -- usually 20 to 500 gallons per acre -- under pressures ranging from 150 to 400 psi or more.
These sprayers usually are mounted on tractors, trailers, trucks, or boats, or are self-propelled. Piston pumps are used and provide outputs up to 60 gallons or more per minute. Large tanks (500 to 1,000 gallons) are required, because the application rate is usually 100 gallons per acre or more. Mechanical agitators are usually standard equipment, but hydraulic agitators may be used. When fitted with correct pressure unloaders, these sprayers can be used at low pressures. All hoses, valves, nozzles, and other components must be designed for high-pressure applications. High-pressure sprayers may be equipped with a hose and single handgun nozzle for use in spraying trees and animals. These sprayers also may be fitted with a boom for broadcast agricultural applications.
- provide good penetration and coverage of plant surfaces,
- usually well-built and long-lasting if properly cared for.
- large amounts of water, power, and fuel needed,
- high pressure may produce fine droplets that drift easily