What is the primary purpose of control valves in a water-based fire protection system?

The primary purpose of control valves in a water-based fire protection system is to control the water supply to the system. These valves play a crucial role in managing the flow of water throughout the system, allowing for the regulation of pressure and ensuring that water is delivered to the areas that need it during a fire emergency. By adjusting the opening and closing of control valves, firefighters and system operators can effectively direct water to the necessary sprinkler heads or other protection devices, maximizing the system's effectiveness in suppressing fire.

Proper control of water supply is essential for maintaining optimal performance in fire protection systems. It allows operators to shut off water to parts of the system that are not needed or to isolate certain sections for maintenance without affecting the entire system. This management capability is vital for both efficiency and safety during fire response operations.

While the other functions related to fire protection systems are important, such as preventing backflow or connecting hoses for firefighting efforts, the fundamental role of control valves is primarily centered on regulating the water supply, making option B the correct choice.