P&ID Symbol for Motor Operated Valve

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2 months 3 weeks ago #9434 by yeosu1081
P&ID Symbol for Motor Operated Valve was created by yeosu1081
What is the correct way of representing a Motor operated Valve. It is M with circle or M with a square. What is the meaning between square and circle with M. I've encountered some drawings use interchangeably.
Need more std ref and correct application for each.

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