Wow! A pneumatic Nelson trigger frame? Very unique! https://www.zdspb.com/media/tech/anim...oppet_fast.gif
I found this gif. Is this the mq valve you're talking about?
I'm not super familiar with this valve.
If so, I'm not clear how the bolt can cycle on the current CCI revolution without the pump arm being pressed.
At 27 seconds it shows the repeatable firing without pumping.