Typical sprayers are comprised of the following basic parts: a tank, a pump, filters in the suction and delivery lines, a boom, and nozzles. Additional components include a nozzle pressure gauge, a control valve including anti-drip mechanism, and a relief valve to bypass excess material back to the tank. The most commonly used machine-operated sprayers for field application are low-pressure sprayers,[12] similar in operation to which are high-pressure sprayers. In addition to the above-mentioned types, commonly used sprayers are air-carrier models and foggers. These models are not operated in the same way as low- and high-pressure versions.
New & Used Heavy Equipment http://www.ritchiewiki.com/wiki/index.php/Sprayer#ixzz2uL9p1w9O