Based on the above sample image, are there any valve types that should be added?
What I plan to do is to provide more information on how each of these valves operate and give a sense of how water flow is affected in a general sense. No current idea on how long it will take both to create all the illustrations and create the accompanying write-up. As there are a good number of valve types to discuss, I may end up creating a base article first, then add in more images and information as time permits.
As an aside, the Max-D valve was rather difficult to draw well and it'll be even more "fun" trying to illustrate how it actually functions.

