I don't see any reason that should not dump the entire reservoir, which I presume is your intention....Bob
Or set up a Sub chamber ( SHOT POT ) which acts like a plenum in a regulated gun. The Intake from HP storage into the sub chamber go's threw a single small hole of @ .040" or less. Volume of the shot pot you can play with easily.So while shot pot will dump a lot of volume, recovery is slow having little air outside the pot able to feed the shot. just an idea
When you consider that a conventional valve with a 12mm seat at 3000 psi would take 525 lbs. to open.... I wouldn't complain too much at 30% of that number....Bob