A flow device for measuring and controlling a fluid flow through a flow pathway of a heating, ventilation, and air conditioning, HVAC, system, comprising: an orifice plate positioned within the flow pathway and defining a variable opening for receiving flow through the flow pathway, wherein the orifice plate comprises: an outer damper comprising a central opening; an inner damper extending through the central opening; and an actuator assembly operatively connected with the orifice plate, wherein the actuator assembly comprises a first actuator coupled to the outer damper and a second actuator coupled to the inner damper,the first actuator and second actuator being ganged together collinearly by a stacking bracket; a first sensor disposed in the flow pathway; and a controller in operative communication with the orifice plate, wherein the controller comprises: a processor; and a memory communicatively coupled with and readable by the processor and having stored therein processor-readable instructions that, when executed by the processor, cause the processor to: determine a pressure differential based on a first pressure measurement obtained by the first sensor; determine a position of the outer damper and a position of the inner damper based on a position feedback received from the actuator assembly; and regulate the variable opening based on the pressure differential and the positions of the outer damper and the inner damper by operating the actuator assembly in a manner that adjusts the positions to satisfy a temperature set point. an orifice plate positioned within the flow pathway and defining a variable opening for receiving flow through the flow pathway, wherein the orifice plate comprises: an outer damper comprising a central opening; an inner damper extending through the central opening; and an outer damper comprising a central opening; an inner damper extending through the central opening; and an actuator assembly operatively connected with the orifice plate, wherein the actuator assembly comprises a first actuator coupled to the outer damper and a second actuator coupled to the inner damper,the first actuator and second actuator being ganged together collinearly by a stacking bracket; a first sensor disposed in the flow pathway; and a controller in operative communication with the orifice plate, wherein the controller comprises: a processor; and a memory communicatively coupled with and readable by the processor and having stored therein processor-readable instructions that, when executed by the processor, cause the processor to: determine a pressure differential based on a first pressure measurement obtained by the first sensor; determine a position of the outer damper and a position of the inner damper based on a position feedback received from the actuator assembly; and regulate the variable opening based on the pressure differential and the positions of the outer damper and the inner damper by operating the actuator assembly in a manner that adjusts the positions to satisfy a temperature set point. a processor; and a memory communicatively coupled with and readable by the processor and having stored therein processor-readable instructions that, when executed by the processor, cause the processor to: determine a pressure differential based on a first pressure measurement obtained by the first sensor; determine a position of the outer damper and a position of the inner damper based on a position feedback received from the actuator assembly; and regulate the variable opening based on the pressure differential and the positions of the outer damper and the inner damper by operating the actuator assembly in a manner that adjusts the positions to satisfy a temperature set point. determine a pressure differential based on a first pressure measurement obtained by the first sensor; determine a position of the outer damper and a position of the inner damper based on a position feedback received from the actuator assembly; and regulate the variable opening based on the pressure differential and the positions of the outer damper and the inner damper by operating the actuator assembly in a manner that adjusts the positions to satisfy a temperature set point.