I think we should change the diagram to reflect the fact that mostdiaphrams havea center reinforced by a pair of washers, rather than being flexible as is currently suggested. If it were built as shown, the center of the diaphram would likely rupture or the entire piece would be blown out the barrel.
- True. It might not rupture, depending appon the material it's made of and the thickness... (for instance, I know some have made small-bore diaphrams out of plain rubber, and I know that tupperware lids often find themselves in use.) At least, it deserves a mention in the artical. Not much of a 'handbook' if it only tells you how one of the most common valves works, but not how to build one.