Drain question

[theMeat]

CMIIW, The reason for the gate valves is to is to prevent air from being drawn into the flow

To quiet the draining, from gurgles, burps, and splashing sounds

If you have running water through the "secondary" without a valve, it will pull air, correct. Making noise

You want the emergency to make noise

I too would want to utilize all the holes

In the tank. Just the way I was made

No. You want the secondaries less than 50% full with water so that water and air can go down without gurgling. You want the full siphon and the secondaries outlets an inch or two below the water level in the sump. You want the emergency outlet above the sump water level so it makes noise when it splashes down.
You use the gate valve on the full siphon to adjust the level in overflow so that the secondaries are less than 1/2 full.
Watch a video on bean animal adjustment, might help understand

 

[theMeat]

Fwiw I’ve used ball valves on most systems I’ve built since bean animal and herbie was a thing, and while they might be a little trickier to get adjusted they work fine
You also no not need valves on any other drains, only the full siphon

 

[Solo McReefer]

You want the secondaries less than 50% full with water so that water and air can go down without gurgling.

I have no idea what this means

I have had drains before that sucked air. They are noisy. I have never experienced "water and air go down without gurgling"

I don't want air in my drains

I suppose that means I don't want "secondaries"

 

[EeyoreIsMySpiritAnimal]

I have no idea what this means

I have had drains before that sucked air. They are noisy. I have never experienced "water and air go down without gurgling"

I don't want air in my drains

I suppose that means I don't want "secondaries"

Yeah, secondaries are supposed to trickle.

 

[theMeat]

I have no idea what this means

I have had drains before that sucked air. They are noisy. I have never experienced "water and air go down without gurgling"

I don't want air in my drains

I suppose that means I don't want "secondaries"

You must have air in your secondary drain, simple physics. Don’t see how a full siphon can work without a secondary. On a 1.5 full siphon pipe you can get over 2,000 gph. Add what goes down the secondary and not sure why you want two full siphons.



In the vid, and most others, notice how the water level is half way up on the elbow of the secondary. Less than half and you’re good

 

[Uncle99]

Got all my stuff from FlexPVC.com.
My gates where $30

 

[Dburr1014]

Dang!!! $100 each!!!! That’s $$$$

Lowe’s and Home Depot have them for less than $20

Amazon has a bunch of options too
4 pack for $37

https://a.co/d/hYa9N98

Careful with Amazon knockoffs, I bought 2 and they leaked where the handle is. Impossible to fix cuz I tried. $20 thrown in my waste basket.

 

[Dburr1014]

My new tank (96x36x25) has 4 drains that are 1.5". I will be doing 2 that will be full siphon (draining from the bulkhead), 1 that will be secondary and the stand pipe will set the water height and the oh poop drain that should be just below the euro brace (I assume). Should I plan on running a gate valve on each of the full siphons? With nothing on the secondary. Thoughts?

Not actually seeing the setup but sounds like they are all in the same overflow.

Do the bean animal, with 1.5 drain on a full syphone is a ton of flow.
The 4th drain I would look into as doing a closed loop if possible. A DC pump and looping back over the top of the tank would add lots of flow. If you have a controller to add safety so it never pulls air your golden.

 

[theMeat]

Not actually seeing the setup but sounds like they are all in the same overflow.

Do the bean animal, with 1.5 drain on a full syphone is a ton of flow.
The 4th drain I would look into as doing a closed loop if possible. A DC pump and looping back over the top of the tank would add lots of flow. If you have a controller to add safety so it never pulls air your golden.

Wouldn’t the pump pulling from the overflow for the closed loop reek havoc on the water levels for the drains?

 

[Dburr1014]

Wouldn’t the pump pulling from the overflow for the closed loop reek havoc on the water levels for the drains?

Good question.
I would think, all things running constant, no... As long as the weir can handle it.
But, with the return pump off maybe you would want the CL off also. That would depend on the BA pipes and how there set.

I did mention having a controller be a good idea in some situations.

 

[MizzouMark]

On my 225 gal I used three of the holes for a BeanAnimal setup and the fourth hole for my return line.