Swing Check Valve 1/2in

[Freind]

Hello,
I am thinking to add a swing valve to my system but I am wondering how much pressure will be reduce.

Below is the link which I am thinking to purchase.

Also anyone know any check value without spring, work on gravity or water weight.
Thank you
https://www.ebay.com/itm/Valterra-2...%3A5555747415f0aa1621526467ffff6c3b%7Ciid%3A1

 

[ca1ore]

Bulk reef supply has them.

 

[davocean]

Really the best bet is to just have an early siphon break, as in lockline/return lines kept high up, as most if not all check valves eventually fail.

 

[BigT75]

1/2" is small in my opinion I use the 3/4


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[Freind]

1/2" is small in my opinion I use the 3/4


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But my line is 1/2 inch. I know i can use the reducer, but why you are suggesting 3/4 inch

 

[Freind]

Really the best bet is to just have an early siphon break, as in lockline/return lines kept high up, as most if not all check valves eventually fail.

I was also considering that option as well.
Just wanted to do some research
Thank you

 

[billdogg]

Check valves in marine systems fail. At the worst possible time - when you actually need them to work. A snail, a asterina star, a bristle worm, or just build of gunk over time. There are way to many ways for them to not work, and the only way to guarantee that they won't is to take them out and clean them. We all know what happens to things like that - they get put off eventually. Then you have a flood.


Design your return and drains so that they do not need them.

 

[mcgyvr]

^^ amen brother... preach

I just make sure my return outlets (elbows is what I use) are just below the water line so they get exposed to air quickly.. That or multiple anti-siphon holes in my previous tanks.. I had a snail block a the only single siphon hole I had on one tank..

 

[Freind]

Check valves in marine systems fail. At the worst possible time - when you actually need them to work. A snail, a asterina star, a bristle worm, or just build of gunk over time. There are way to many ways for them to not work, and the only way to guarantee that they won't is to take them out and clean them. We all know what happens to things like that - they get put off eventually. Then you have a flood.


Design your return and drains so that they do not need them.

What about using a tiny air valve at the main water discharge line?

 

[BigT75]

Swing Check Valve 1/2in

But my line is 1/2 inch. I know i can use the reducer, but why you are suggesting 3/4 inch

Reducers? 3/4" is larger than a half imo 1/2 return line is small unless it's a small tank or your running 2 otherwise again imo it isn't enough

But I do agree X the check valve


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[mcgyvr]

What about using a tiny air valve at the main water discharge line?

yes.. an "anti-siphon" hole (a hole drilled just under or at or slightly above the water line) is a great choice.. Drilling more than one is the best option in case a snail or algae,etc.. decides to block one..