Which type of shutoff valve is used specifically for servicing individual rooms or areas?

The selection of a shutoff valve for servicing individual rooms or areas is best represented by the term "zone valve." A zone valve is specifically designed to control the flow of fluid to a specific zone or area within a building, allowing for individual service and control. This makes them particularly suitable for applications where specific rooms or sections need to be isolated for maintenance or adjustments without affecting the entire system.

In contrast to in-line valves, which are used to control flow within a pipeline generally, or riser valves that manage the flow in vertical sections of piping, zone valves provide targeted control. Service valves are also used for maintenance but typically apply to broader system components rather than individual rooms or areas. Thus, zone valves are the most appropriate choice for managing service to specific spaces.