Herbie sump ?

[Kabong]

Has anyone tried running a line off a herbie drain to feed a fuge?
Using a ball valve to control the flow.
As in a design like this.

[mark]

I have one of my drains plumbed like that so some flow is bypassed to a dedicated refugium and it doesn't act like a Herbie.

If you closed the valve completely all you would be doing is just send all your water to the fuge. To have your drain behave as a Herbie you would need to restrict the overall flow from the drain so you would need to valve both legs. Could see it being a little difficult to set up.

[Kabong]

I don't mean to have the ball valve control the Herbie aspect of the drain.
It would still have the gate valve up above the branch off.

[KrazyKuch]

Yeah that should work...haven't tried it myself though

[untamed]

Yes, that looks like it would work.