What is required to be installed on the pump discharge assembly?

The requirement for a listed check valve or backflow preventer on the pump discharge assembly is essential for ensuring the integrity and functionality of water-based fire protection systems. A check valve allows water to flow in one direction, preventing backflow that could potentially compromise system pressure or allow contaminants to enter the potable water supply. In fire protection applications, this is crucial as it maintains the system's readiness to deliver water when needed and protects the water supply from contamination.

By requiring a listed check valve or backflow preventer, the design ensures compliance with safety standards and regulatory codes, fostering reliable operation during emergencies. This component plays a significant role in maintaining the system's hydraulic characteristics and preventing siphoning back into the supply line, which could lead to failures in fire suppression capabilities.

While other components like pressure relief valves, flow meters, and regulating valves are important in various contexts and contribute to the overall functionality of water-based systems, they do not specifically address the critical aspect of preventing backflow, which is a primary concern in maintaining water quality and system efficiency in fire protection systems.