What type of water-based fire protection system uses a proportioning valve?

What type of water-based fire protection system uses a proportioning valve?

• A. Deluge System
• B. Wet Pipe System
• C. Foam System
• D. Dry Pipe System

Answer: (C)

Proportioning valves are used to meter foam concentrate into the water stream to create a foam solution. This mixing device is a defining feature of foam fire protection systems, where foam concentrate is fed into the water at a specified ratio to blanket and suppress hydrocarbon or related fires. Wet pipe, dry pipe, and deluge systems deliver only water (though they differ in how the water-filled piping is charged), so they don’t require a proportioning valve. Therefore, the system type that uses a proportioning valve is the foam system.

Proportioning valves are used to meter foam concentrate into the water stream to create a foam solution. This mixing device is a defining feature of foam fire protection systems, where foam concentrate is fed into the water at a specified ratio to blanket and suppress hydrocarbon or related fires. Wet pipe, dry pipe, and deluge systems deliver only water (though they differ in how the water-filled piping is charged), so they don’t require a proportioning valve. Therefore, the system type that uses a proportioning valve is the foam system.