[Fab] went with a simple butterfly valve design, similar to the throttle valve in most gasoline-powered cars. The butterfly vane rotates to vary the flow, turned by a small SG90 servo. A Wemos D1 ...

According to FMI, the butterfly valves market will be worth USD 10.3 billion in 2023, and USD 19.4 billion by 2033. Sales of butterfly valves are projected to increase by 6.5% over the projection ...