In OpenPlant Modeler placement of the wafer type components and valves should exhibit auto flange placement at its port. There might be several occasions where the users want to get different types of flanges to appear automatically. By default Weld Neck Flanges appear automatically. Refer to the image below where a valve has been placed. The Weld Neck Flange appears and connects automatically on both ends of the valve. The description below will assist the user to get different flange types (For Example: SLIP_ON Flange or a Lap Joint Flange) by changing the entries made in the AutoFittingRules.xml file.
Also check Help file using keyword Auto Flange for exploring more and getting control of Flange through spec.