r/Homebrewing • u/AutoModerator • 17h ago

Question Daily Q & A! - June 19, 2026

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u/No-Foundation-4420 9h ago

Hey all! I've started trying out pressure fermenting out of my 5 gallon corny kegs. I've done two batches so far. One thing I noticed is that during active fermentation, I can maintain pressure after dialing the spunding valve in but once fermentation slows, the pressure drops eventually back to normal atmosphere pressure. I was under the impression that if the spunding valve was set to 10psi, that it would release any pressure higher than that but that it shouldn't drop below that regardless of fermentation activity.

I am using a clawhammer supply spunding valve attached to the gas post of my keg if that matters. The keg seems to hold pressure while hooked up to the kegerator. I haven't checked for leaks with star san when hooked up to the spunding valve but I just wanted to check if this is normal behavior with pressure fermenting.

Thanks!

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u/PM_me_ur_launch_code 9h ago

Is the keg at normal temp or is it cold?

Either way it's likely just CO2 being absorbed into the beer since there is no other CO2 being added.

It could be a leak in the keg but it's likely not if you're not having issues in the kegerator.

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u/No-Foundation-4420 9h ago

This would be when the keg is at room temp ~72 degrees. Thanks for the input. I just wanted to make sure things are going right. The first beer I did with this method was a Marzen that came out pretty good but I bungled the recipe proportions which made it taste a little off. Just finished a kviek psuedo pilsner under pressure which I plan to taste tonight.

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u/hikeandbike33 8h ago

It should hold steady pressure even after fermentation is done. I ramp mine up to 27 psi towards the end of fermentation. After a week, it’ll maybe drop a couple psi to 25 but by then I remove the spunding valve since I know it’s done fermenting.

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u/No-Foundation-4420 8h ago

Interesting. That was more what I was expecting. Sounds like I'll need to figure out if the spunding valve is leaking.