Thanks for the quick responses! Forgive the hasty drawings, assume that in option 3 we could put a forward stop on the piston to prevent the piston from getting pushed further in the barrel. Would option 2 still out preform it? Would moving the chamber further forward enough to allow the first half ...

Hey guys, I've been a lurker but decided to go ahead and create an account. I have O-rings and three ideas for a barrel-sealing piston valve; my question is which of these three designs would be the most effective in terms of flow co-efficient and opening time? Assume the vent port to be the same in...