Thanks for the reply Brian.

So you're suggesting a solenoid valve with pneumatic actuation?

Do you know of any write-ups that would shed some light on how to build one?

Could anyone suggest a pneumatic valve that is relatively compact and would suit my needs?

e.g. With the Inlet port at the back ...

Hey, I've recently started thinking about a PCP build.

I've done research but I'm obviously still a complete novice, so excuse the ignorance.

As the title suggests my idea is a PCP QEV 'rifle'.

PCP.jpg

This is a very simplified drawing, but gives the general idea. But I have some questions ...