/community-hubs/valves-actuators-regulators/b/vcp-weblog/posts/diagnosing-pressure-relief-valve-bellows-issuesI found an “oldie but goodie” article in Valve Magazine , Introduction to Pressure Relief Devices – Part 1 . The author highlights the origin of pressure relief valves (PRVs) from numerous boiler explosions in the early 1900s. The purpose of PRVs areen-USTelligent Community 13