Which valve is crucial for shutting off fire protection water supply?

The control valve is essential for shutting off the water supply to a fire protection system. Its primary function is to regulate the flow of water in the system, ensuring that it operates effectively during a fire emergency. By being able to close this valve, a facility can isolate the fire protection system for maintenance, repairs, or in the event of an emergency where the flow of water needs to be stopped immediately.

In the context of fire protection systems, control valves play a critical role in determining how and when water can be delivered to extinguish a fire. They are typically located at strategic points in the system, allowing for easy access and operation. Proper installation and maintenance of control valves are vital for ensuring that the fire protection system remains functional and reliable.

While the other valves mentioned serve important functions, such as regulating flow rate or pressure in the system, they do not provide the necessary capability to shut off the entire water supply to the fire protection system as effectively as the control valve does. Thus, the control valve stands out as the key component for this specific requirement.