Sharing of some incidents that occur when there are faults with the “special” accessories of control valves

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There are many types of control valve accessories; the most common ones include filter pressure reducers, solenoid valves (including air-operated valves), valve positioners, and feedback devices. Accessories such as lock valves (positioning valves, locking valves), accelerators, pneumatic converters, quick-release valves, and check valves are used relatively less often. These less common accessories are employed when there are special requirements for control valves, such as the need for \"three-break protection\" or control features like fast opening and slow closing. So, in the daily maintenance work on site, what kind of \"strange\" troubleshooting experiences have everyone had? How was the problem diagnosed at that time? And then how was it solved? I believe that the failures associated with such “special” attachments are mostly very serious production incidents, and every company experiences an countless number of such incidents each year. Let’s all pool our ideas and share some case studies, so that we can use them as a basis for reflecting on similar accidents!