Abstract: Embodiments of the invention provide a variable flow nozzle assembly capable of flowing a fluid within a range of flow rates in response to a variable upstream pressure. A spray tip defines a chamber and a flow port in communication with the chamber. A pre-orifice defines a flow path in communication with the chamber and a metering portion along the flow path. A spool valve defines a spool rod portion positioned within the metering portion and configured to be moveable in response to an applied upstream fluid pressure between a minimum and a maximum flow position. A biasing mechanism biases the spool valve toward the minimum flow position. An opening between the metering and spool rod portions allows for fluid flow through the flow path to be greater when the spool valve is in the maximum flow position than when in the minimum flow position.