An airflow control system comprising: a valve including a valve disk rotatable within a flow control duct; a valve actuator including a movable piston connected to the valve disk, wherein the valve actuator is operable to adjust a position the valve disk; a sensor operable to detect a parameter within the flow control duct, downstream of the valve disk; a pneumatic controller configured to regulate a pressure within the flow control duct downstream of the valve disk, wherein the pneumatic controller is operable to adjust the position of the valve disk when the pressure within the flow control duct downstream of the valve disk exceeds a regulation pressure set point, the pneumatic controller being fluidly coupled to a first chamber arranged adjacent to a first side of the movable piston of the valve actuator; a torque motor fluidly connected to the valve actuator and fluidly coupled to a second chamber of the valve actuator arranged adjacent a second, opposite side of the piston; and a digital controller operably coupled to the torque motor, wherein the digital controller is configured to regulate the pressure within the flow control duct downstream of the valve disk independently from the pneumatic controller when the pressure downstream of the valve disk is below the regulation pressure set point, the digital controller being operable to command the torque motor to either increase, decrease or maintain the pressure regulation in response to a comparison of the detected parameter and a digital set point; wherein the pneumatic controller includes a cantilevered lever and a second valve, wherein the lever is rotatable to adjust a position of the second valve in response to the pressure within the flow control duct downstream of the valve, wherein the lever has a preload, and the preload of the lever is equal to the regulation pressure set point, and wherein a biasing member is connected to the lever, and a biasing force of the biasing member is equal to the preload. a valve including a valve disk rotatable within a flow control duct; a valve actuator including a movable piston connected to the valve disk, wherein the valve actuator is operable to adjust a position the valve disk; a sensor operable to detect a parameter within the flow control duct, downstream of the valve disk; a pneumatic controller configured to regulate a pressure within the flow control duct downstream of the valve disk, wherein the pneumatic controller is operable to adjust the position of the valve disk when the pressure within the flow control duct downstream of the valve disk exceeds a regulation pressure set point, the pneumatic controller being fluidly coupled to a first chamber arranged adjacent to a first side of the movable piston of the valve actuator; a torque motor fluidly connected to the valve actuator and fluidly coupled to a second chamber of the valve actuator arranged adjacent a second, opposite side of the piston; and a digital controller operably coupled to the torque motor, wherein the digital controller is configured to regulate the pressure within the flow control duct downstream of the valve disk independently from the pneumatic controller when the pressure downstream of the valve disk is below the regulation pressure set point, the digital controller being operable to command the torque motor to either increase, decrease or maintain the pressure regulation in response to a comparison of the detected parameter and a digital set point; wherein the pneumatic controller includes a cantilevered lever and a second valve, wherein the lever is rotatable to adjust a position of the second valve in response to the pressure within the flow control duct downstream of the valve, wherein the lever has a preload, and the preload of the lever is equal to the regulation pressure set point, and wherein a biasing member is connected to the lever, and a biasing force of the biasing member is equal to the preload. <EOS>