Plumbing Question

reefnewbie54321

In Memoriam
I was reading this thread,
http://reefcentral.com/forums/showt...92&perpage=25&highlight=plumbing&pagenumber=1
about how to queit your overflow but I have a few questions. After reading 10+ pages I was still confused how it worked.

I have a overflow with 2 drains and 1 return
I should put a ball valve before my return pump at the end of my sump
The water level will be set by the ball valve to be right over one of the drains
Then I have a backup drain that is slightly higher incase the fisrt one gets clogged

I dont understand how a ball valve is setting the water level

I also want to run my skimmer off the overflow , will this work with this type of set up?
 
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