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Hajimoto:

--- Quote from: Backyard Bandit on September 01, 2020, 10:22:44 AM ---Gauntlet .177 and .25. Using a .45l bottle now. If I swap out the lower pressure rupture disc for a PI on the reg. Will it display the output pressure of my reg? Is there an equation to calculate output pressure of regulator? .
177 - 10.5gn at 1050 fps I think it should be more but Im having pellet probe oring issues with .177.
.25 - 28.24gn h&n barracuda hunter extreme  at 925 fps.
And have you had issues with broken belleville washers( only the black ones)?

--- End quote ---
If you are willing to give up the safety of the burst disc then yes a pressure indicator could be installed in the low pressure burst disc location.
Something to consider. If the air rifle you are using has been properly certified it would have had to undergo the 5/3 testing pressure. So an airgun that operates at 1100 PSI like the .177 Gauntlet for instance, will need to pass a 1833 PSI test. Now this maximum pressure test should not be confused with operational pressure which was established as 1100 PSI in this case. If the regulator would to fail for some reason, the low side burst disc is the only thing stopping that airgun from being exposed to 4500 PSI.
In the case of the .25 Gauntlet, its operating pressure is 1900 PSI which means it could safely see 3150 PSI and not fail. Again seeing the 3150 PSI and not failing does not mean it should operate at that pressure.

There are Belleville washer calculators that will allow you to determine what the range of a stack would be but typically they are premium applications that require some sort of buy in.
Another thing to do is read through some of the previous post here on the GTA which will walk you through the paths already walked.

Examples:
https://www.gatewaytoairguns.org/GTA/index.php?topic=49648.20
https://www.gatewaytoairguns.org/GTA/index.php?topic=137971.0

As for broken belleville washers, I have seen them loose tension or flatten but not break.


Be safe

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