A ball valve is a shut-off valve that uses a rotating ball with a hole to control the flow of gasses and liquids. The ball can be rotated 90 degrees (quarter-turn) with a handle or actuator to open or close the valve. Learn what a ball valve is, how it works, and what types of ball valves exist. Find out the parts, materials, designs, and advantages of ball valves for different fluid flow control applications. What is a ball valve and how does it work? We explain the parts of a ball valve , how they are powered and more in this article. Learn about ball valves, a versatile and efficient flow control device that uses a spherical ball to open or close fluid flow. Explore the different types, materials, advantages, and applications of ball valves in various industries.