Hate to dig up and old thread...
I have one tap on my keezer that is consistently problematic... It sits lower in the keg (making it colder and pick up more carbonation) and it uses a D-coupler (so it passes through warmer metal).
Long story short, its always pours foamy on the first cup or so until everything cools down...
I'm wondering if this tap would solve my problem.
Any insight would help,
I've been running mine for over a year now, and I'm very glad I got them. Here's a quick rundown on what I've found.
Pros: I run four kegs on CO2 with a dual regulator, so for the four kegs I can basically set two different PSI. These faucets work great to be able to dial down (or up) the flow rate to control foaming when multiple kegs are set to the same PSI. Now that I have five beers on tap (one on Nitrogen), I have a stack of 5oz plastic cups on the keezer for "samplers". Being able to dial down the flow rate is great when you're doing small pours like that. Finally, it makes filling growlers a breeze. I shut the flow rate way down and you can fill a growler with very little foam (I still use a growler filler).
Cons: The only complaint I have is that they do seem to drip a little more when they are first shut off, than the other non-flow-control faucets I had on my kegerator. Again, this is only a few drops after you pour a beer, and it's a very minor issue. I usually either just leave the glass under the tap for a minute or so, or put a piece of paper towel under the faucet after I use it (I have a drip tray, but it's easier to catch the drip on a paper towel rather than clean the drip tray every time).
So again, I'm very pleased with the choice I made.
To address your questions, I can't say for sure these would resolve your issue or not. Pouring cold beer through a warmer line will produce foam as the CO2 comes out of solution. My first pours are always a little more foamy as I have a coffin style keezer, and despite my best efforts I'm sure the beer lines in the tower are a few degrees warmer than the beer is. Mine is not enough to be an issue, I just know there will be a little more head on my first pour.
Having said that, with a flow control faucet, you would have the ability to dial back your first pour to a low flow rate, which should reduce foaming. Once you start the pour and everything has cooled to beer temperature, I think you'd be able to increase the flow rate back up to finish the pour.
I hope that helps!