Larger 3/4" QEV piloted by 1/4" QEV

[AlfiePB IanB]

A bit of background I have been using a Parker 3/4" valve at 400psi max (bit scary) but now want to built one using a Humphreyas heard many positive opions and even seen a page where a guy modified his (spring/hole) to fill the chamber but I dont want to do this to my new qev. I have been using 12mm BB as any larger gets pricey. But for this gun I want to use maybe 12 or 15mm with something like a 36" Stainless seemless tube, it needs to be a ste up from my last gun and I will actually attempt to create something worth looking at, not just using!!

I have a Humphrey QE5 and just waiting on a QE2 (IIRC) I would like to pilot the larger with the smaller allowing for a smaller valve to pilot the 2nd ( entire system), Can anyone point me in the right direction of connectiong the QEVS and also was looking at something like Clippard MJV-3 as the pilot valve/triger as they handle arond 300psi (manuafcturer figure, so sure can take more).

Ideally I would like a 2/3 way valve so it fires, then released returning to the refill position, any ideas on a valve suitable for flow and pressure that would do this and not costs the earth, I would preffure a push button rather than slide vale.

many thanks Ian