Budron
Well-Known Member
- Joined
- 6/7/09
- Messages
- 136
- Reaction score
- 5
The real purpose of the dump valve is to dump the trub, the racking arm is above the yeast bed, dump the yeast and you lose the beer which has displaced the yeast as it is below the racking arm.
I have posted this before in the Fermentasaurus thread.
https://ssbrewtech.zendesk.com/hc/en-us/articles/202956495-More-on-dumping-trub-from-a-Chronical
If you are talking about a commercial unitank, there is a rotating arm on the inside of the of the racking arm allowing you to do as the name suggests and rotate it around until you pick up the hop trub and some of the left over extra yeast which has settled out. This allows for the absolute minimal wastage possible. The video you posted shows this perfectly.
Going back to our man Jasper, at the start of the below video he states getting the yeast off the bottom of the beer as soon as possible is best.