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Old 05-11-2013, 03:10 PM   #11
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http://www.bulkreefsupply.com/catalo.../view/id/1747/

Tear this valve down once a year to keep the internals clean. This valve provides no restriction when it's open. Pressure drives the plunger completely out of the flow. More expensive, but worth it.
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Old 05-11-2013, 03:20 PM   #12
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OK I been looking at those as well. How long have you had your setup running?
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Old 05-11-2013, 03:21 PM   #13
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+20 years.
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Old 05-11-2013, 04:32 PM   #14
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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.
This is true but I never once slagged off the valves you use

Just just took it that just because they didn't work for me they must be cheap

Interesting you say they are great just out on interest how do you back wash your pumps I just flick the power on and off just wondering how you do this
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Old 05-11-2013, 06:00 PM   #15
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I have the same Iwaki pumps I started with. I put hot tub style strainers on the intakes so they couldn't ingest anything that wouldn't go thru the impeller. I have never back flushed the pumps or done any maintenance on them except keeping the cooling fans unobstructed. Guess I'm lucky, but it turned me into a Iwaki fan.

Certainly didn't mean to say you bought cheap valves. I meant that as recommendation to not buy a flapper style valve over the plunger type. No insult meant.
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Old 05-11-2013, 07:47 PM   #16
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I have the same Iwaki pumps I started with. I put hot tub style strainers on the intakes so they couldn't ingest anything that wouldn't go thru the impeller. I have never back flushed the pumps or done any maintenance on them except keeping the cooling fans unobstructed. Guess I'm lucky, but it turned me into a Iwaki fan.

Certainly didn't mean to say you bought cheap valves. I meant that as recommendation to not buy a flapper style valve over the plunger type. No insult meant.
I also have strainers on the pumps

But its still good to back wash them every now and then it dislodges any slim you get on the impeller or in the pipes

Plunger or flapper valve they all fail

I have plunger type air non return valves and they have also failed in the past

Air pump non return valves also restrict air flow please don't tell me they don't

Unless the diameter of the pipe you install the valve in isn't changed in anyway then its kind of obvious they will restrict flow to some extent
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Old 05-11-2013, 08:02 PM   #17
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Yes, but the plunger type keeps the entire pipe open until it closes. It moves into that pocket you see, so it really doesn't restrict flow as the plunger moves back easily.

Haven't used a air pump for a while, but I know what you mean. I always placed mine high over my freshwater tanks for that very reason.

Nothing is perfect. But some things are engineered better than others. And I have a great deal invested in live stock as I am sure you do. I have taken all the precautions I can afford to not have a major collapse due to something as simple as a accidental back flow that empties my tank.
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Old 05-12-2013, 02:30 PM   #18
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Just as I thought, I'll just have to try and see for myself. I'll be getting the 1" wye valve from BRS and check on it once a month during a water change. Also I'll drill a hole in my return pipe just in case. Thx guys for your opinions, and I'm glad it ended well with you two.
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