As above said your barrel should be inline with the chamber. Unless the gun absolutley needs to be like this I would change it. You will gain performance. Same thing with the hose. The shorter the hose the better it will work which is why I said to ditch it. Good luck!!

Thanks for the input once ...

Thanks for the suggestions Zorlord and Tallahassee. I can move the valve up to the barrel side. Just out of curiosity, what "effectiveness" am I jeopardizing by having the valve on the bottom?

Now see that long clear gay hose, get rid of that too!! Put the blowgun right to the fitting on top of the valve. How many psi are you using???You need a decent amount of air like 30 psi or even more.

Thanks again. Yeah, I haven't really posted a pic of how I intended to trigger this thing. It ...

Is the valve going in the right direction?? also see that little white plastic thing in the diaphragm, take it out and toss it. Let me know if that did the trick...

Mattyzip, I can't believe it was something that simple. I removed the white plastic piece as you suggested, and now it's holding air ...

Are you filling directly into the chamber? Try filling into the pilot (where you tapped for the blow gun) Or try filling into the chamber more slowly. The extra pilot volume from the hose and blow gun may be preventing it from sealing quickly enough. Pressure is building on the chamber side and ...

Hey guys. Building my first gun. Nothing special. I purchased an orbit 57101 1" valve. I built my chamber, into the valve (arrows are facing away from chamber), then barrel out of the valve. I drilled a hold right in the center, tapped it and threaded a barbed fitting in and ran a hose (short) to a ...