> For the complete documentation index, see [llms.txt](https://help.auxalia.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.auxalia.com/plant-tools/plantspecdriven/how-to-use/configuration/pid-classes-symbols.md).

# P\&ID Classes & Symbols

This chapter explains which classes you may want to create and what to consider in regards to symbols (e.g. Flanges, Tees). We also suggest Default Values for the PSD\_Key property used for filtering the Parts from the Pipe Spec.

We also created a drawing which contains the flange and tee symbols for the various standard used by Plant 3D and which are use for the [Test Projects](/plant-tools/plantspecdriven/how-to-use/test-projects.md).

[Download](http://documentation.auxalia.com/EN/PSD%20Symbols.dwg)

![](https://2994090777-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FZH2AGHzvPfBW7YdaaGc0%2Fuploads%2Fgit-blob-d135c4836f334d76861926ffa05f3455258003a0%2FPSD-Config-013.png?alt=media)

Table of Content:

* [Hand Valves Class](/plant-tools/plantspecdriven/how-to-use/configuration/pid-classes-symbols/hand-valves-class.md)
* [Piping Fittings Class](/plant-tools/plantspecdriven/how-to-use/configuration/pid-classes-symbols/piping-fittings-class.md)
* [Flange Class](/plant-tools/plantspecdriven/how-to-use/configuration/pid-classes-symbols/flange-class.md)
* [Fasteners Class](/plant-tools/plantspecdriven/how-to-use/configuration/pid-classes-symbols/fasteners-class.md)
* [Tees Class](/plant-tools/plantspecdriven/how-to-use/configuration/pid-classes-symbols/tees-class.md)
* [PSD\_Key Suggestion](/plant-tools/plantspecdriven/how-to-use/configuration/pid-classes-symbols/psd-key-suggestion.md)