This part of ISO 14617 specifies graphical symbols for valves and dampers in diagrams, including symbols for general-purpose valves, those used in fluid power systems and hygienic valves used in the food and pharmaceutical industries.
You can specify the type of files you want, for your device.ISO 14617-8:2002, Graphical symbols for diagrams - Part 8: Valves and dampers | ISO/TC 10/SC 10. I have read it a couple of times and even shared with my family members. Really good. Couldnt put it down.