Which valve releases excess air or water pressure from a piping system?

The Pressure Relief Valve is specifically designed to release excess air or water pressure from a piping system to prevent damage or failure. This valve operates automatically when the pressure in the system exceeds a predetermined level. By allowing excess pressure to escape, the Pressure Relief Valve helps maintain safe operating conditions within the system, ensuring that components such as pipes and fittings are not subjected to stress that could lead to leaks or bursts.

This function is vital in many systems, including standpipe systems, where maintaining proper functioning and safety is crucial. Other types of valves mentioned, such as the Pressure Control Valve, Pressure Reducing Valve, and Pressure Restricting Device, serve different roles. The Pressure Control Valve may regulate pressure but does not specifically vent excess pressure. The Pressure Reducing Valve is used to lower pressure to a suitable level for downstream applications, while the Pressure Restricting Device limits the flow rather than managing pressure directly. Understanding the purpose of each valve type is key to properly managing and maintaining piping systems.