Which device shall be installed where an electric variable speed pressure limiting controller is installed and the maximum total discharge head adjusted for elevation exceeds the pressure of the system components?

Which device shall be installed where an electric variable speed pressure limiting controller is installed and the maximum total discharge head adjusted for elevation exceeds the pressure of the system components?

• A. Pressure relief valve
• B. Safety valve
• C. Check valve
• D. Flow restrictor

Answer: (A)

The main idea is protecting the system from overpressure when the discharge head, adjusted for elevation, can exceed what the system components are rated to handle. A pressure relief valve is designed to open automatically when system pressure rises above a set limit, venting water to prevent damage to valves, piping, and other equipment. In a setup with an electric variable speed pressure-limiting controller, the controller helps keep pressure in range, but if the elevation adds enough head to push pressure beyond component ratings, the pressure relief valve provides a safety margin by releasing the excess pressure as needed. A safety valve serves a similar purpose in some applications but is typically used on steam or pressure vessels and is less flexible for a water sprinkler system. A check valve only prevents backflow, and a flow restrictor lowers flow without venting excess pressure. Therefore, the appropriate device is a pressure relief valve.

The main idea is protecting the system from overpressure when the discharge head, adjusted for elevation, can exceed what the system components are rated to handle. A pressure relief valve is designed to open automatically when system pressure rises above a set limit, venting water to prevent damage to valves, piping, and other equipment. In a setup with an electric variable speed pressure-limiting controller, the controller helps keep pressure in range, but if the elevation adds enough head to push pressure beyond component ratings, the pressure relief valve provides a safety margin by releasing the excess pressure as needed. A safety valve serves a similar purpose in some applications but is typically used on steam or pressure vessels and is less flexible for a water sprinkler system. A check valve only prevents backflow, and a flow restrictor lowers flow without venting excess pressure. Therefore, the appropriate device is a pressure relief valve.