Can this remote sump plumbing work or will it just cause problems…

[EeyoreIsMySpiritAnimal]

Putting the gate valve so far down the drain line won't mitigate the speed as well as if you put it just after the tank bulkhead. You want to slow the water down as soon as possible, not bring it to a screeching halt after it falls 10 feet.

I see others with more experience commented on this already, so I defer to their answers