What device regulates the flow of foam concentrate into an eductor?

The device that regulates the flow of foam concentrate into an eductor is known as the proportioner. A proportioner is specifically designed to measure and mix the correct amount of foam concentrate with water to create a foam solution. It ensures that the appropriate ratio of foam concentrate is maintained for effective fire suppression, allowing for optimal performance of the foam system during emergency response.

While a metering device might seem relevant since it also deals with measuring, it's distinct in that it might not control the mix ratio in the same precise manner that a proportioner does when dealing with foam systems. The throttle valve is used to control fluid flow within a system but does not specifically regulate the foam concentrate like a proportioner does. The activation switch is responsible for turning systems on or off, but it does not play a role in the regulation of concentrate flow. Hence, the proportioner's function is integral to maintaining the effectiveness of foam application in firefighting scenarios.