Check valve for liquid flow from dosing pump? - The Planted Tank Forum
 
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post #1 of 6 (permalink) Old 10-21-2014, 03:17 PM Thread Starter
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Check valve for liquid flow from dosing pump?

Hi all,

I dose macro/micro fertilizers using peristaltic pumps (Drew's Dosers). The fertilizers flow through airline tubing into holes in the side of my PVC Rex-style CO2 reactor.

Short version of question is: does anyone know of a check valve that I could use inline with the airline tubing that would allow LIQUID flow in one direction but not the other? There are a million check valves that allow AIR flow in one direction but not liquid flow in the other. But I need a liquid/liquid valve. (Or confirmation that the air/liquid valves will also work for liquids.)

BTW: I know that the peristaltic pumps will block flow as long as they are connected. I'm worried about failure in the flex tubing inside the pump.

sns26

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post #2 of 6 (permalink) Old 10-21-2014, 04:41 PM
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post #3 of 6 (permalink) Old 10-21-2014, 06:32 PM Thread Starter
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Would these work for airline tubing? Airline has a 3/16" OD, and the smallest one of these valves is 1/4.

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post #4 of 6 (permalink) Old 10-21-2014, 06:45 PM
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I'm pretty sure standard air line has 3/16" ID and 1/4" OD.
However, these push to connect fittings are iffy with airline tubing because of the flimsy thin wall (1/32").
Unless you need the 3/16" ID (for barb type connections), I'd switch to 1/4" OD with thicker walls.
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post #5 of 6 (permalink) Old 10-21-2014, 07:16 PM
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Normally the lines lead above water (squirting into a sump for example) to prevent siphoning.

I would be incredibly skeptical of attaching the dosing pump lines in a way that not only allows a full siphon, but also applies back pressure.

Check valves will always fail, the question is only how long you have before they do.


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post #6 of 6 (permalink) Old 10-21-2014, 07:48 PM Thread Starter
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Quote:
Originally Posted by 691175002 View Post
Normally the lines lead above water (squirting into a sump for example) to prevent siphoning.

I would be incredibly skeptical of attaching the dosing pump lines in a way that not only allows a full siphon, but also applies back pressure.
I hate the look of things going over my rimless tank's rim. Currently there is nothing that goes over it and I want to keep it that way. (Everything is plumbed through the bottom--heaters, reactor, filter, etc., even the small surface skimmer)

I've been using my dosing pumps in this "high-siphon-risk + backpressure" configuration for a couple of years now with no leaks yet...but I agree that it's not optimal.

sns26

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