Non return valve for liquids (fertilizer)???
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Old 03-20-2015, 04:31 PM   #1
x-man
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Non return valve for liquids (fertilizer)???


Do you know where to buy non return valve for liquids, I don`t need non return valve for air pump, I need it for tube with liquid (fertilizer) and I need it to enable fertilizer flow only in one direction?

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Old 03-20-2015, 04:47 PM   #2
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Quote:
Originally Posted by x-man View Post
Do you know where to buy non return valve for liquids, I don`t need non return valve for air pump, I need it for tube with liquid (fertilizer) and I need it to enable fertilizer flow only in one direction?

Thanks.
http://www.usplastic.com/catalog/def...arentcatid=870
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Old 03-20-2015, 05:10 PM   #3
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Yes, that is what I need but on ebay is not easy to find it because 99% of them promote it for co2 or air, maybe some of them working with fluids but they talking only about air/co2...
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Old 03-20-2015, 05:15 PM   #4
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You can buy from US Plastics I believe. At the very lest you can find a valve applicable to your needs with their listings and then search that out on fleabay or ama-zon.
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Old 03-21-2015, 06:21 AM   #5
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I use just the cheap check valves they sell for air pumps. Worked fine for years.
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Old 03-21-2015, 08:02 AM   #6
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What size tubing or pipe?
Scroll down a bit.
https://www.plumbingsupply.com/pvccheck.html

I use a flapper or swing type because it takes almost no pressure to lift it to allow flow, yet it holds back the weight of the water in my 72 gallon bowfront when I turn the pump off.

The spring type takes too much pressure to open.

For smaller tubing, look into drip irrigation products. There are check valves that will work for 1/4" drip tubing, which is pretty much the same size as air tubing.
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Old 03-21-2015, 11:14 AM   #7
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If its a peristaltic pump you really don't need check valves. As the pump "pinches" the tubes, it would close of the tube at usually 3-5 points, stopping the fluid from going anywhere.

bump: Picture of the internals of the pump. I do believe most of us use peristaltic pumps for dosing.
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Old 03-21-2015, 08:15 PM   #8
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If you just keep the lines out of the water, you have no need for check valves. I had mine setup that way for that reason, since my containers were not sealed, any potential siphon could be bad.
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Old 03-23-2015, 01:57 AM   #9
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Some dosing pumps come with check valves. Yeah they should by design seal but there are some issues. I had to put a check valve on each line to keep the fertilizer from draining back.
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