Seems simple but I am looking for some software to help calculate the linkage geometry needed to linearize different size butterfly valves driven by a motorized actuator. Actuator has slidewire feedback and would like to be close to linear as possible on the butterfly valve. Valve is controlling air flow to burners on a furnace. I basically only need a starting point. On my furnace, a motorized actuator drives a butterfly air valve with a "connecting rod" or linkage. The air flow through the butterfly valve is not directly proportional to how far open it is. For example, when the valve is 10% open I may be getting 30% flow. when the valve is 20% open I may be getting 50% flow. By connecting the linkage in the correct location on the arms of the valve and the actuator, I should be able to get a linear flow output through the valve that corresponds with the actuator position. I was hoping to find software to assist in calculating this linkage "geometry". Searched the internet with no luck so just looking for something that could give me a starting point.

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