John Spiegel
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- Joined
- Jul 30, 2019
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Just got a spunding valve and am planning on fermenting my next beer under pressure in a corny keg set to around 10 psi. For pressure transfers, I've heard you need to equalize pressure between the two kegs, and that you can do this by hooking up the Serving Vessel (SV) to a regulator set to the same pressure that the spunding valve on the Fermentation Keg (FK) was set to. From there, use a jumper cable (liquid/liquid disconnect) to hook up the two kegs and release the PRV in the SV to begin the flow.
My two questions regarding the process:
1. Do I need to have the PRV continually opened/a gas disconnect hooked up to allow gas to continually flow out of the SV? Or once the flow goes, can I let the PRV close again and it will continue?
2. This is the one I'm more uncertain of. To equalize the pressure between the two kegs, rather than using my tank, is it possible to use a second jumper cable (gas/gas) to connect the two kegs and allow the pressure between the two to equalize that way? In my head, the pressure in FK would drop to fill SV; from there I could purge SV to remove the oxygen from the system. Because I wouldn't have hooked up liquid/liquid line yet, no liquid should transfer over. From there, I could connect the liquid jumper, open up the PRV on the SV to start the flow, but because the gas lines are connected, wouldn't that cause the CO2 from the SV to be transferred back to the FK, thus continuing the process? I've read a few posts/watched a few videos, but haven't seen anybody do it this way, so I'm not sure if it doesn't work that way or if I just seriously misunderstand the concept here and should instead keep the FK hooked up to a regulator to keep the pressure transfer going. Or maybe it's just a bad idea to purge SV this way but would a doable way of transferring once the two kegs are already equalized? Any clarification would be helpful.
My two questions regarding the process:
1. Do I need to have the PRV continually opened/a gas disconnect hooked up to allow gas to continually flow out of the SV? Or once the flow goes, can I let the PRV close again and it will continue?
2. This is the one I'm more uncertain of. To equalize the pressure between the two kegs, rather than using my tank, is it possible to use a second jumper cable (gas/gas) to connect the two kegs and allow the pressure between the two to equalize that way? In my head, the pressure in FK would drop to fill SV; from there I could purge SV to remove the oxygen from the system. Because I wouldn't have hooked up liquid/liquid line yet, no liquid should transfer over. From there, I could connect the liquid jumper, open up the PRV on the SV to start the flow, but because the gas lines are connected, wouldn't that cause the CO2 from the SV to be transferred back to the FK, thus continuing the process? I've read a few posts/watched a few videos, but haven't seen anybody do it this way, so I'm not sure if it doesn't work that way or if I just seriously misunderstand the concept here and should instead keep the FK hooked up to a regulator to keep the pressure transfer going. Or maybe it's just a bad idea to purge SV this way but would a doable way of transferring once the two kegs are already equalized? Any clarification would be helpful.