I thought it was something different but now that you've labelled it up it IS a normal barrel sealer.mark.f wrote:it's not significantly different from a normal piston valve.
Instead of chamber filling by seepage round the piston when it seals against the barrel, you've sealed off the piston with o-rings and added a check valve. One step backward to go one step forward?
The usual rubber sealing face is replaced by a third o-ring which will be hanging on for dear life at 800psi when the valve fires.
?