Counter-pressure filling pressure

Zabuza said:

So I just filled up some bottles the other day with my new counter-pressure filler, and I have a quick question or two:

(1) My instruction sheet says you want to aim for a PSI in the bottles that's about 2-3 PSI greater than what's in the keg. This seems wrong to me and indeed, in practice, I found it impossible to fill a bottle under these conditions. The greater pressure in the bottle pushed the beer back up the dispensing line whenever I switched over to beer flow (which makes complete sense to me). I'm assuming bottle pressure should be 2-3 PSI LOWER than what is in the keg.

(2) I'm not quite sure how bottle purging is supposed to work (conceptually). I got a nice counter-filler from morebeer that has a regulator for bottle pressure and a pressure relief valve to let air vent as CO2 fills up the bottle, but I'm not sure how that's supposed to work. The CO2 is coming down the dip tube and the bottle is sealed by a stopper - where does the air go to get out? It can't flow up the tube the CO2 is coming out of, but that's the only place that leads to the pressure relief valve.

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DeafSmith said:

I have the MoreBeer Deluxe CPBF and built a bottling station to make it easier to use:

https://www.homebrewtalk.com/f51/bottling-station-counter-pressure-filler-339462/

In post #3 of that thread is a description of my bottle filling process. If my beer is carbonated at 12 PSI, I set the regulator for about 13 or 13.5 PSI during filling (still experimenting to find the best level). This pressure is applied to both the filler and the keg through a "T" connection.

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Zabuza said:

(2) I'm not quite sure how bottle purging is supposed to work (conceptually). I got a nice counter-filler from morebeer that has a regulator for bottle pressure and a pressure relief valve to let air vent as CO2 fills up the bottle, but I'm not sure how that's supposed to work. The CO2 is coming down the dip tube and the bottle is sealed by a stopper - where does the air go to get out? It can't flow up the tube the CO2 is coming out of, but that's the only place that leads to the pressure relief valve.

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bioguy said:

I don't have the exact filler that you do, but mine is similar. There is a tube within a tube. The tube that goes to the bottom will deliver CO2 to the bottom of the bottle when the 3-way valve is pointing to the gas. Use the purge valve to expel the air in the bottle. CO2 is heavier than air and the air will flow out as you purge the bottle. Then you turn the 3-way valve to liquid and beer will flow in, displacing most of the CO2

Here's a video showing you how to use your filler.
Video Link: http://youtu.be/2NrjcNjRHpE

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