/community-hubs/valves-actuators-regulators/b/vcp-weblog/posts/partial-stroke-tests-and-diagnostics-for-emergency-shutdown-valves-1454677992Emergency shutdown valves perform the work of bringing the process to a safe state in the event of a hazardous condition. They must be periodically tested, because, unlike other valves, they may sit dormant for a long time. This 2:22 YouTube video,en-USTelligent Community 13