What is the main purpose of a shutoff valve in plumbing systems?

The primary function of a shutoff valve in plumbing systems is to stop the flow of water. Shutoff valves are strategically installed in various locations throughout a plumbing system, allowing for the control of water flow to specific fixtures, pipes, or the entire system. This capability is vital during maintenance or repair work, as it allows plumbers to isolate sections of the system without having to drain the entire system. The ability to stop water flow is particularly important in preventing leaks or flooding, ensuring that repair tasks can be conducted safely and effectively.

In contrast, increasing water pressure or regulating temperature involves different mechanisms and components within the plumbing system, such as pressure regulators or thermostatic devices, and filtering contaminants is typically the function of filters or purification systems. Therefore, the primary role of a shutoff valve remains focused on halting the passage of water when necessary.