Every now and then, valve specialist might face some similar issue as follow:
End user (via email / phone) : [Help] We have some valve problem on-site, by the way it has no readable name plate. Can you please advise??
Valve specialist: Hmmm ok, what is the type of the valve?
End user (via email / phone) : We don’t know for sure. You’re the specialist, help us figure it out… I am sending you now photo of the valves (taken from low resolution EX camera or from poor angle).
Valve specialist: [scratching head] ok…
Trait 1: All valve specialist must be able to identify valve type in a split second. Practice your capability by assessing some of picture below