Which type of valve is typically used as an Isolation Valve?

The ball valve is commonly used as an isolation valve due to its design that allows for a quick and reliable shut-off of the flow. Ball valves consist of a spherical closure element that rotates within the valve body to either allow or block the passage of fluid. When the valve is turned to the closed position, the sphere blocks the flow path completely, providing a tight seal that prevents leaks. This makes ball valves particularly effective for isolating sections of a piping system, which is essential for maintenance, repairs, or system modifications without affecting the entire system.

In comparison, check valves allow for the flow in one direction and prevent backflow, but they do not isolate a section of the system. Pilot valves are used to control other valves and systems, not to shut off flow in main lines directly. Flow control valves regulate the flow rate in a system rather than isolating parts of it. Therefore, the ball valve's ability to provide full isolation makes it the preferred choice for that function in irrigation and many other applications.