Abstract: A spray nozzle of two piece structure threaded together and including a fitting for mounting on a pressurized liquid supply pipe and including an orifice controlling liquid flow to a one piece molded nozzle of plastic material screw threaded onto the fitting. The nozzle includes spaced longitudinal side walls interconnected by a top wall and a bottom slot. A diffuser plate or blade is mounted between the side walls at the discharge end of the nozzle. The side walls of the nozzle converge from the inlet end of the nozzle toward the nozzle blade or plate at the discharge end. Each side wall converges toward the center line of the nozzle at an angle ranging between 1° and 3°. A thin metal plate forms a closure for a major portion of the length of the bottom slot with a rearward end having an air inlet below the orifice in the fitting to draw air into the nozzle as liquid exits the orifice into a larger volume area at a reduced pressure.

Abstract: A spray nozzle for discharging liquid in a spray pattern onto a ground surface includes a structure to obtain optimum diffusion of the liquid droplets in the spray pattern. The spray nozzle includes a diffuser plate having an upwardly extending diffuser blade thereon. The diffuser plate and blade are adjustable vertically and longitudinally in the discharge end of the nozzle to enable variation in the diffusion characteristics of the liquid discharged from the nozzle. The diffuser plate is also removable for replacement with other plates having alternative diffuser blades. The structure enables variation in the spray pattern of the liquid passing between the diffuser blade and the inner surfaces of the side walls of the nozzle by changing the location of the diffuser plate and blade in relation to the discharge end of the side walls of the nozzle or by using another plate having a different diffuser blade for different diffusion characteristics.