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Yes that’s what I’m referring to, is it necessary? Can I remove it and plug the hole? Does it effect the regulator performance?

Looks like something else might bust before this does.


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Well you can do what you like but basically most would say.....no you cannot remove it
It opens if 1 st stage exceeds a certain pressure ( usually between 200-300 psi) .
Keeps full tank pressure (650-1000 psi for CO2) from entering the regulator.

For safety there should actually be another one in the outlet at like 50psi but few add that one. Some rare 2 stage regs have them built in.

Hmmm looks like someone plugged it already.
Why not just cut the seatbelts out of their car .. ;)
 

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Another clue that this is not a pressure relief valve is the fact there is threads at the end that can be plugged. Pressure relief valves are not designed that way for that exact reason.
No some are threaded to port out gas..

 

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Well I stand corrected. I wonder what pressure his is? 1000 PSI, like the one shown here, does you no good with co2 running at 800 PSI. At that point it might as well be plugged or removed. It might be stamped on the unit like picture? I guess you might also get a hint by what application the regulator was originally used for.
Yea I saw that too... There are a bunch of brands with " like" safeties
Maybe one will list pressure. Should be around 30O-ish
See the 2 types.
Hmmm actually looks like the ported one is somewhat adjustable



O/T These are so cool for "downstream" .
 

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I was thinking about it. The pressure relief valve is there to protect the equipment downstream of the low pressure side of the regulator. Say for example you had a 300# pressure relief valve and a slow diaphragm leak. The pressure with build and build on it way to 300 psi. I wonder what kind of damage everything down stream would sustain? I bet you that bubble counter of flow meter would pop long before 300 PSI. Maybe not.
Yea but moreso just the regulator at least in our case.
Common CO2 tubing is rated for 40psi or lower.
No idea in the plastics BUT I got mega crazing on an in line atomizer at 45 psi to the point of plastic failure.
Assuming 1st stage is set to around 90 psi..that is what would hit downstream in the event if second stage seat failure.
Even if the system can take it it will probably kill your fish
the greater the pressure, the greater the flow rate.
I put 40-50 psi reliefs on a tee right after reg outlet..and clamp all 1/4 od hoses
Bit overkill but hey only adds like $20.

And you have 2 seats /diaphragms that can fail.
If second stage fails you get first stage pressure.
Looking over a few specs seems that can be as little as under 100psi to around 300psi depending on the 1st stage setting.
I do seem to recall that like 300psi safety on the 1st stage is rarer than lower ones.
 

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Sorry, tired of editing..
Victor® Brass Relief Valve (For SR 250, 350, 400, 450 Series Regulators)
By
Victor Equipment. Listed pressure 400 psi.
Certainly would peg the lp gauge.


Alternate is 200 psi.. go figure.
 
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