What is the function of a service valve in a plumbing system?

The function of a service valve in a plumbing system is specifically to regulate the flow of water to different fixtures or appliances within a plumbing system. This enables maintenance or repairs to be conducted on individual aspects of the plumbing without having to shut off the supply to the entire system. Service valves are typically found close to fixtures like sinks, toilets, or appliances, allowing for localized control over the water supply. This localized regulation is crucial in providing flexibility and ensuring that users can manage flow in specific areas effectively.

In contrast, while other options address important aspects of plumbing systems, they do not encapsulate the primary role of a service valve. For instance, controlling pressure levels and connecting multiple pipes pertain to broader areas of plumbing system design and implementation rather than the specific functionality of a service valve. A main shutoff valve serves a different primary purpose of stopping water flow throughout the entire system rather than controlling flow to individual components.