How could you fix them? Did you replace any parts? Would it possible to show me how it looks like inside?
So the regulator passed the leak test for both stage. Should I just go ahead and use it? I will do a test where I have the cylinder valve open, charge the 2nd stage and leave it for a while to make sure the pressure downstream wont increase.
charged 1st stage with normal co2 pressure, and if the pressure on second stage not creeping up while the handle is either on or off, the regulator is good to use.
I didn't take the picture, those are not my regulators, I fix them for another hobbyist because I have the tools and know the proper way to have them open.
These prostar 3032/matheson 3810 regulators are original price tag around one thousand dollar a piece, they are complete 316 stainless steel structure, for high purity gas service. Only plastic part inside is high quality HDPE valve seat, rest of the internal parts are 316 stainless steel, and, the inside should be super clean if under the right gas service. A regulator like this will last forever....
So far as I have seen, there is only one reason that they go malfunction, please don't ask me the specific reason, but if you can open the regulator, tighten the internal parts the regulator will be fixed.