Those valves are probably the coolest thing ever but I still like the cheapies. I bought two of the higher pressure ones and one of the lighter pressure one, and have been using these for about a year and a half now with no issues. I was poo-pooed for getting them but I still like them because they are simple don't get seem to get clogged and can be easily cleaned.
The first is rated as adjustable for 0-20 psi I find it really only holds at about 18 psi or lower, which is great for transfer from keg to corny keg as it has a finer adjustment, it is McMaster-Car #48935K25 found on this page:
http://www.mcmaster.com/#catalog/119/488/=lyrxni
I have been having better luck keeping my final fermentation below 18 anyways. I can always connect the corny's to a higher psi later. (Addendum: After thinking about it for a while I remembered why I use this one for transfer to corny kegs rather than for fermenting. It tends to leak pressure slowly over a period of time. Not important during transfer or initial fermentation but a problem during the last phase of fermenting.)
The second and the one I bought first and still use most using the yellow or weakest spring which is rated at 25 - 50 psi, but I find easily adjustable down to about 2-3 psi and up, is a bit sensitive to adjust, but easy if your tolerance is within + or _ 1 psi, which for me is way close enough. Again simple contruction easy to clean, uses the same body as the first but has a stronger spring and a silicone and brass insert instead of a spring and ball bearing.
This is McMaster-Carr # 50265K23 found on this page:
http://www.mcmaster.com/#brass-relief-valves/=lys25o
If you are on a budget like I am, I love the prices of these, I can buy two or three, and don't have to interchange my setups so much. I would recommend them to anyone who can't taste the difference between a beer that was mostly fermented at 9 psi or 11 psi. Yes they are brass but the beer shouldn't be touching them anyway.
My two cents.
The first is rated as adjustable for 0-20 psi I find it really only holds at about 18 psi or lower, which is great for transfer from keg to corny keg as it has a finer adjustment, it is McMaster-Car #48935K25 found on this page:
http://www.mcmaster.com/#catalog/119/488/=lyrxni
I have been having better luck keeping my final fermentation below 18 anyways. I can always connect the corny's to a higher psi later. (Addendum: After thinking about it for a while I remembered why I use this one for transfer to corny kegs rather than for fermenting. It tends to leak pressure slowly over a period of time. Not important during transfer or initial fermentation but a problem during the last phase of fermenting.)
The second and the one I bought first and still use most using the yellow or weakest spring which is rated at 25 - 50 psi, but I find easily adjustable down to about 2-3 psi and up, is a bit sensitive to adjust, but easy if your tolerance is within + or _ 1 psi, which for me is way close enough. Again simple contruction easy to clean, uses the same body as the first but has a stronger spring and a silicone and brass insert instead of a spring and ball bearing.
This is McMaster-Carr # 50265K23 found on this page:
http://www.mcmaster.com/#brass-relief-valves/=lys25o
If you are on a budget like I am, I love the prices of these, I can buy two or three, and don't have to interchange my setups so much. I would recommend them to anyone who can't taste the difference between a beer that was mostly fermented at 9 psi or 11 psi. Yes they are brass but the beer shouldn't be touching them anyway.
My two cents.