Abstract: An abrasive blasting system which includes an improved mixing and control valve assembly together with an improved manually operable discharge nozzle assembly. The mixing and control valve assembly comprises a housing defining first and second chambers connected by a generally circular opening. An abrasive particle inlet and an outlet are formed in the second chamber. A stem extends axially through the opening between the first and second chambers to define an open annular passageway through which pressure fluid supplied to the first chamber passes in a swirling motion to mix with the abrasive particles in the second chamber and impel them out the outlet. A valve member carried by the stem is arranged for selective engagement with the outlet to stop flow through the assembly.