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Old 05-06-2013, 12:41 AM   #1
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Alright, let the arguments begin. From what I've been reading so far is that one half of aquarists hate em, and the other always uses them.
The reason I'm thinking about a check valve is because I've decided to use a spray bar for my return. Thinking 10" long, 90į elbow going straight down to a drilled acrylic tube with a sealed up end. I don't want to drill the holes right next to the water surface to prevent agitation to minimize gas exchange (co2 loss), so to prevent syphoning when the pump goes off I'm thinking of using a true union swing check valve from marinedepot.com.
What parts actually fail on these, and since its a fw tank, would that lessen the chance of a failure? Or does anyone have other ideas to break the syphon? Like I said don't want holes near the top. But also I was thinking of drilling a hole in the top of the elbow and inserting and airline into it bent into a U shape so it wouldn't squirt water out and would allow air to get in once the water level drops a bit?
Thoughts, ideas?
Or would a ball check valve be better?
http://m.grainger.com/mobile/details...lap552?R=6NC62
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Old 05-06-2013, 01:29 PM   #2
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That's odd, nobody has anything to say about check valves?
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Old 05-06-2013, 05:33 PM   #3
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If a siphon cannot form during a power outage, a check valve would be unnecessary. But if there is any chance of siphoning, I would use one. I have never seen any downside to using them. When using a sump, they are useful to keep your supply lines from becoming returns if the power dies.
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Old 05-10-2013, 03:14 PM   #4
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I had them on my system and they slowed down the pump power

And when it was needed it would fail

They give you a false sense of security

It all depends on how high you run your sump level and if it can handle the over spill

If its canister you don't need it
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Old 05-10-2013, 06:53 PM   #5
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You have been buying bad check valves as the good ones don't effect flow at all. Yes, if not maintained they will fail. Otherwise, they can prevent a catastrophe.
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Old 05-10-2013, 10:27 PM   #6
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Quote:
Originally Posted by Gregcoyote View Post
You have been buying bad check valves as the good ones don't effect flow at all. Yes, if not maintained they will fail. Otherwise, they can prevent a catastrophe.
Here we go

Like the thread starter stated in his FIRST post he doesn't want to start a big debate

You say they are great I say they are rubbish that should be the end of it

How can you say I had cheap rubbish check valves you don't know me or the items I had
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Old 05-10-2013, 11:11 PM   #7
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You made a very general statement. They are life savers and have saved my tank countless times. No debate intended.
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Old 05-11-2013, 08:49 AM   #8
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You made a very general statement. They are life savers and have saved my tank countless times. No debate intended.
If you have that many power outages I take it you must have a large UPS system or generator

I had them on all of my 3 pumps but find it much safer to put a overflow pipe on my sump to drain any back wash

I spent over £8,000 on my tank can you see me buying £1 return valves

Like I said you don't know me or my setup

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Old 05-11-2013, 02:33 PM   #9
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Same can be said of your knowledge of me. My system has returns under the water surface towards the bottom to blow current from behind the rocks. If my UPS fails and I didn't have a good quality check valve, my tank would drain into the basement. My issue was the broad statement that check valves are a waste of time. Simply not accurate.
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Old 05-11-2013, 02:35 PM   #10
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What kind of check valves are you using and where'd you get em?
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