Which one is NOT a category within the isolation valves?

The category referred to in the context of isolation valves often includes several types, each designed for specific functions within a piping system. Globe valves, gate valves, and ball valves are all recognized types of isolation valves used to start or stop fluid flow.

Globe valves are effective for throttle regulation, whereas gate valves are typically used for on/off control but offer minimal resistance to flow when fully open. Ball valves are known for their ability to provide a tight seal and quick shut-off capability. Each of these types is widely used in various industrial applications as standard isolation tools.

Angled valves, while they may serve specific functions in systems that require directional flow change, are not commonly categorized among the primary isolation valves. Instead, they are often seen as specialized valves or used in particular configurations. Thus, identifying the angled valve as not fitting into the primary category of isolation valves clearly delineates it from the more prevalent options.