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butterfly vs. ball

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tschmidlin:
What do you think are the relative merits between butterfly and ball valves?

I figure the butterfly valve is easier to clean, but the ball is less likely to get clogged.  Anything I'm missing?

tom:
I haven't had any butterfly valves clog.  I do use a Bazooka screen inside the kettle though.

weithman5:
for brewing purposes there is not likely to be any significant difference due to the type of valve. the manufacturer specific may have design features that makes one easier to maintain over the other. on a big scale when a ball valve is opened the flow path is clear and there is less pressure drop.  the disc in a butterfly valve will remain in the flow path causing a slight pressure drop.  i have not read any great throttling features of either but i suspect that a butterfly valve is a little easier to throttle flow as it affects the flow as it affects  the flow more around the periphery as the valve is cracked whereas a ball valve only affects one side of the flow path as it is cracked.

hokerer:
Wow, first read that a having something to do with turkeys.  I think I need a beer.

james:
butterfly on the cold side, ball on the hot side.  Especially if you use whole leaf hops (especially a massive wet/fresh hop beer) without a screen/bags.

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