Patent ID: 9405298
Filing Date: 2016-08-02
CPC Classification: G05D,Y10T

Claim Text:
1. A system for dividing flow of a process fluid in a predetermined flow ratio, the system comprising: a plurality of fluid sources for providing a plurality of process fluids; a plurality of mass flow controllers, wherein each mass flow controller of the plurality of mass flow controllers is coupled to a corresponding fluid source of the plurality of fluid sources; a plurality of sets of modulating valves, wherein each set of modulating valves comprises a plurality of modulating valves, and wherein each set of modulating valves is coupled to a corresponding mass flow controller of the plurality of mass flow controllers; a process chamber having a central region and an outer region and a plurality of inlets for delivering each process fluid of the plurality of process fluids at the predetermined flow ratio between the central region and the outer region, wherein each inlet is coupled to a respective one modulating valve from each set of modulating valves; and a controller coupled to the plurality of sets of modulating valves, the controller configured to control the duty cycle of respective valves in the plurality of sets of modulating valves to divide the flow of each process fluid of the plurality of process fluids in the predetermined flow ratio between the central region and the outer region and to independently control a composition of the plurality of process fluids delivered through each inlet.