1.) Yes, a 2" ball valve will open pretty quickly. I would recomend a bronze valve instead of a PVC one, though. The Supah is many times better than the ball, but you'll still get some good distance with the ball.
2.) Shc 40 and sch 80 have the same OD (outer diameter), this means you can use sch 40 fittings on sch 80 (although that would defeat the purpose of making a sch 80 chamber...) and vice versa. Also, as long as the threaded adaptors in question are NPT threaded, they will fit any other NPT threads in any type of material
Hope this helps
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