Which valve requires a 90-degree turn to operate fully?

A ball valve requires a 90-degree turn to operate fully because of its design. In a ball valve, a hollow, perforated, and pivoting ball is used to control the flow of fluid through the valve body. When the valve handle is turned a quarter turn (90 degrees), the hole in the ball aligns with the pipe, allowing fluid to flow freely. Conversely, turning the handle back to its original position closes the valve by rotating the ball so that the solid part obstructs the fluid flow. This simple and efficient operation makes ball valves popular in various applications where quick shut-off is essential.

The other types of valves mentioned offer different methods for flow regulation. Globe valves, for example, require multiple turns to open or close due to their internal components and required movement through the valve body. A gate valve also operates with a linear motion rather than a rotational motion, requiring several full turns to move the gate in or out of the flow path. Check valves are designed to prevent backflow and do not have a specific opening mechanism like the ball valve; instead, they rely on the flow of fluid to open or close.