Scott, I think all that the OP drew is the poppet, which is in 2 pieces.... What you think is a "sail" is part of the poppet stem.... The outer rounded part is the "main" poppet....Bob
That sounds like a spool valve on that patent number. No pictures showing. RKR why dont you give it a try, not like you loose much. Bob there is more closing force at play than just the spring and stem surface area. We have flow and very fast flow to be exact. Marko