A high-pressure liquid projection assembly for cleaning and/or deburring industrial parts, having a housing with an inlet adapted for connection with a pressurized liquid source, an outlet and a fluid passageway connecting the inlet to the outlet. A fluid chamber is formed in the housing and disposed around an intermediate portion of the passageway. At least one opening is formed in the housing which fluidly connects the chamber to the passageway while a control port on the housing is fluidly connected to the chamber. The control port is adapted to be connected to a variable flow pressurized liquid source to thereby vary the projection cone pattern from the outlet as a function of the valve opening.