Originally Posted by jimmayhugh
Since butterfly valves tend to be more of an on-off, ball valves tend to do a better job at controlling flow rates than tri clover butterfly valves. We usually recommend butterfly valves at vessel outlets and on fermenters and tri clover ball valves on pump outlets and vessle returns like mash tun sparge and vorlauf returns.
That makes sense. The "more of an on-off" part is what I was worried about.
The other reason I'd rather not use a ball valve for taking samples is that I know there is liquid that gets trapped in the ball when it is closed. If I'm taking a very small sample just for a refractometer reading and a small taste, I'm going to get a lot of that trapped liquid, and it seems like it wont be the best representation of the majority of the fermenting beer. I don't really know how it will be different, but it's separated in an enclosed space... Also, If I want to add oak chips to a beer and taste how that is progressing, I'll get all of that trapped beer that hasn't been absorbing the oak flavors in my daily sample.
Another thing I'm looking at is this sample valve:http://www.glaciertanks.com/TriClamp_Sampler_Valve-TriClamp_1_1_2_x_1_2_Sampler_Valve.html
Seems made exactly for taking samples, but I'm not sure how well it will work for emptying the beer into kegs. Probably it's fine, but it may be annoying that it is slow to open and close. And I'm not sure how easy these are to clean. I don't really know how the mechanism works. Seems like a garden hose valve? Anyone ever used one of these sample valves?