In AutoCAD Plant 3D , are essential four-character codes that determine how a 3D piping component is represented in an automated isometric drawing. While the TYPE tells the software how a component behaves (e.g., if it's a flange or a valve), the SKEY dictates its specific visual symbol. Understanding the Role of SKEYs
If you place a valve in the model, the software reads the spec, sees "V1," and knows to draw a generic gate valve symbol in the Iso. If the SKEY is missing or invalid, the software panics and defaults to a generic "unknown" block (often a square or a question mark). autocad plant 3d iso symbol skey