Pneumatic questions, sorry!

[Max]

It would be very difficult for me to put the dump valve between the buffer and the QEV but if that is my only option I will probably have to make a custom component to make it fit together in the space I've got.
I don't know why yours doesn't fire, as I see it, it is the same as switching the 5/2 valve to dump the gas in the pipe going to the QEV causing it to fire.
perhaps an option would be to severely restrict the gas flow out of the dump valve to the pressure doesn't drop fast enough to fire it, but then it would take forever to empty. I am sure Mario said to me at Maidstone I could use a small spring to stop it misfiring but I am struggling to find one suitable. The best I have come up with is using a paper clip wrapped round a large pencil to make it into a spring shape but I doubt that will work for long!

[Liftoff]

Can't you fit a Tee fitting directly to the buffer? Then you could connect the QEV to one side and the dump valve to the other. Don't know how placing a spring on the QEV will work, the way I see it once you dump the inlet of the QEV, spring loaded or not, the pressure inside the buffer tank will push the sliding seal inside the QEV and fire the ram.