Ball valves and butterfly valves are both quarter-turn (90-degree turn from fully opened to fully closed) rotary valves. The family of rotary valves also includes cone and plug valves. They are used to control the flow of most types of gases or liquids across a wide range of temperatures and pressures. Butterfly and ball valves are both popular for their relatively low cost, long service life and dependability. However, there are a few differences to help the user choose between them. A ball valve is (in simplest terms) a ball with a hole running through it. Turning the valve positions the hole to either block, partially block or complete the line of flow through the valve. A butterfly valve is a disk mounted on a rotating shaft. When fully closed, the disk completely blocks the line. When fully opened, the disk is at a right angle to the flow of gas or liquid.

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