Hi Jeroen,
While generating pcf file for isometric generation, CAESAR will create a valve if the rigid weight is not zero. Actually, at 8000, there is no valve symbal. CAESAR can automate the isogen process, if you don't agree with some places in dwg/dxf drawing, you can modify it by yourself. You can send mt the CAESAR II and pcf files, so I can exam your model in more details.
Regards,
Shawn Zhong
COADE, Inc.
szhong@coade.com
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Shawn Zhong
CADWorx & Analysis Solutions
Intergraph Process, Power, & Marine