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Re: APD #1269 CO2 regulators

I'm using an ancient Victor 2 stage oxygen regulator that I had collecting 
dust.  I switched the inlet fitting to CO2.  Because it's a 2-stage 
regulator, it is stable at very low delivery pressures.  For a while I had 
been using a tiny Victor single-stage oxygen regulator, but it was not stable 
and eventually started leaking (the delivery pressure would creep up without 
bounds even when the regulator pressure was set to zero).  I don't have a 
needle valve; I restrict the flow with several inches of copper tubing that I 
hammered flat in the middle until it would just barely pass any CO2 at 30 
psi.  I guess I'm operating at about 1 psi, but if this regulator breaks the 
copper restrictor will prevent me from having a disaster.  The CO2 runs to 
the inlet tube of my little power filter.  I have no idea how many CFH I am 

I looked up acetylene regulators in a Victor product catalog, and all of them 
had a maximum inlet pressure of 3000 psi (you would expect about 800 psi 
since the tank-side guage only goes to 400).  I guess they use the same 
castings for all the regulators and just change the springs, guages, and 
fittings. Since acetylene has a working pressure of less than 15 psi, 
acetylene regulators might be more stable than oxygen or CO2 regulators.  You 
could also get a new spring installed to make it operate in the "natural gas" 
range (0 to about 2 psi).

best regards,