What are the initial letters used for the instrument symbols of pneumatic control valves everywhere?
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i? for electrical signal input? , P for pneumatic actuation? X for uncategorized? (This seems to be quite commonly used, but the standards stipulate that it may be used only once or a limited number of times within a single design, and its meaning must be indicated in the document.)
For pneumatic on/off valves, we generally use XV; for control valves, we use FV, PV, etc