Pulse width modulating spraying system

A liquid spraying system comprising:

• a housing having a liquid inlet for connection to a pressurized liquid supply and a downstream liquid outlet;
• an electrically operated pulse width modulation control having a valve reciprocally moveable with respect to said liquid outlet for controlling the direction of a modulated liquid discharge from said liquid outlet based upon frequency and duty cycle of valve movement;
• a spray nozzle assembly mounted downstream of said liquid outlet comprising a nozzle body and an upstream liquid directing plate;
• said nozzle body defining a conical chamber converging inwardly in a downstream direction that communicates with a discharge passage of said nozzle body;
• said housing liquid outlet being defined in an end plate of said housing, said end plate and said liquid directing plate defining said expansion chamber between said end plate and said liquid directing plate into which a modulated liquid discharge from said housing liquid outlet is directed;
• said liquid directing plate being formed with at least one ring of circumferentially spaced liquid directing passages about a central flow axis of the nozzle body, said liquid directing passages each being angularly oriented at an acute angle between 35° and 45° to the central flow axis of said nozzle body for directing pulse width modulated liquid from said housing liquid outlet and expansion chamber into said nozzle body conical chamber for discharge from the nozzle body discharge passage in a conical spray pattern.