Patent ID: 7726589

Claim:
A system for applying an electroless plating solution, the system comprising: a silver nitrate source; a reducer source; a water source; a dual nozzle spray gun for applying an electroless plating solution to an associated workpiece, the spray gun including a handle; a trigger connected to the handle; a nozzle assembly connected to the handle, the nozzle assembly including a first fluid path having a first outlet and a second fluid path having a second outlet; a first fluid passage in communication with the first outlet of the nozzle assembly; a second fluid passage in communication with the second outlet of the nozzle assembly; a switch selectively activated by the trigger upon movement of the trigger; a valve assembly in fluid communication with the first fluid passage and the second fluid passage, the valve assembly including first and second valves and first and second solenoids, the first valve controlling the delivery of silver nitrate toward the first fluid outlet and the second valve controlling the delivery of reducer toward the second fluid outlet, wherein the valve assembly selectively opens the first valve and the second valve simultaneously so that silver nitrate from the first outlet and reducer from the second outlet exit at substantially the same time and mix downstream from the outlets such that a fluid mixture reaching an associated work piece comprises 48%-52% of silver nitrate from the first outlet and 48%-52% of reducer from the second outlet; and a control configured to operate between a first operating position and a second operating position, when in the first operating position the spray gun being in communication with the silver nitrate source and the reducer source through the control and the outlets of the spray gun being blocked from the water source and when in the second operating position the outlets of the spray gun being blocked from the silver nitrate source and the reducer source through the control and the outlets of the spray gun being in communication with the water source through the control; wherein the spray gun is a modified spray gun that included a mechanically actuated needle valve, the spray gun includes an insert threaded into an opening at a front end of the gun and a switch mounting plate connected to the insert, the spray gun further including a button mounted to the switch mounting plate, a rod connected to the trigger and a plunger connected to the rod, wherein the plunger contacts the button when the trigger is depressed to close the switch.