Hello,
I have a victor CO 2 regulator that is a new rebuild. I turned it on the other day and hooked it to my craftsman mig welder and the blow-off valve on the reg. went off and the secondary gauge maxed out on pressure. I can't turn it on now and get the blow-off to stay shut. I even added a few shims to the spring and it still blows off. I took everything apart and the diaphragm and gaskets are good. Do I have dirt or something in the pressure valve part of the regulator? I have never run into this before, it has me stumped . I am sure it is simple. Could the welder have something pluuged in it? I would think it is the regulator though.

Any ideas please give your opinion. Don't hesitate thinking that it might not be helpful.

Thanks in advance,
Jackal