Patent ID: 8075282
Filing Date: 2011-12-13
Classification: A01M,Y10T

Abstract:
1. An agricultural sprayer, comprising: a sprayer tank; a centrifugal pump having an inlet and an outlet; a fluid delivery line coupling said outlet to said tank; a suction line being connected to said inlet and adapted for being connected to a nurse tank discharge line; a compressed air supply; a venturi having an inlet, an outlet and a throat, with said inlet being coupled to said compressed air supply and said outlet being coupled to said sprayer tank; a pump priming line coupled directly between said throat and a location of said suction line upstream of said inlet of said centrifugal pump, said priming line contains a priming check valve which opens only toward said throat, whereby, when said suction line is coupled to said nurse tank discharge line and said pump is operated to cause fluid to be conveyed from said nurse tank to said sprayer tank, said pump may be primed by energizing said compressed air supply to cause a vacuum to be created at said throat and air to be evacuated from said suction line and cause fluid to be drawn to said pump inlet so as to prime said pump.