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All Springer/NP/PCP Air Gun Discussion General > PCP/CO2/HPA Air Gun Gates "The Darkside"

Signs of a failed regulator?

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Kragman1:
Hi all

I have a new to me DAR Gen 3 in .22 that is acting strangely, at least to me.  Keep in mind that this is the first time I've owned a regulated PCP, and I'm starting from zero, knowledge-wise.

I was getting around 425 fps with a 90% filled tube and the hammer adjustment set to be flush with the rear of the action.  I was able to turn it in roughly 3 full turns then back it out 1/8 turn or more, which got me up into the 600 fps range.  However, for the next three magazines (30 shots) the velocity increased by roughly 10 fps for every shot until I was into the 900's and making 33-34 fpe.

I don't understand that.  Even if the regulator simply didn't work, I would expect the rifle to perform like an unregulated PCP. 

So if anyone can point me in the direction of a solution, I'd really appreciate it.  Hopefully, I'm doing something dumb since getting to the regulator adjustment requires more disassembly than just popping it out of the stock. And I'd be perfectly happy with the OEM setting.  Not looking for max power.

Tha ks all!

billygee:
Some regulators are kinda finicky and need to be Degassed before any adjustments

Did you Degas before adjusting the regulator ?

Bill

nervoustrigger:
The behavior you describe is that of a regulator that has experienced a failure of the seal on the adjuster. 

The DAR gen 3 regulator is similar in construction to a Huma regulator:



The adjuster is the brass part on the bottom right.  What happens when its O-ring fails is reservoir pressure bypasses the regulator and feeds directly into the plenum.

Kragman1:
Thank you guys.

Bill - no, I did not.  I didn't expect.to need to do anything like that.

Nervoustrigger - that what's I imagined might be happening, but I still don't understand why the rifle doesn't simply act as if it's not regulated, rather than going through the long steady climb....

Well, I'll have to see what I can do about it. 

Life is an adventure!

nervoustrigger:

--- Quote ---I still don't understand why the rifle doesn't simply act as if it's not regulated, rather than going through the long steady climb....
--- End quote ---

What was the reservoir pressure when you stopped shooting?

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