This type of valve features three ports enabling flow control between multiple fluid paths. It employs a cylindrical or conical plug with a passage or passages that, when rotated, direct the fluid flow. For example, it can be used to divert flow from one line to another, mix fluids from two sources into a single outlet, or select between two different input sources for a single output.
These valves are frequently chosen for their compact design, quick operation, and relatively simple maintenance requirements. They offer a cost-effective solution for various fluid control applications. Historically, these valves have been utilized across many industries, including chemical processing, oil and gas, and water treatment, due to their versatility and robustness in demanding operating environments.