Plastic non return valve

Discussion in 'Anything DIY Related' started by Boendoe, 5 Jun 2009.

  1. Boendoe

    Boendoe

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    Hi all I'm looking for a Plastic non return valve to stop my back siphoning, but I can only find the normal Brass ones. does anyone know where to get one?


    Thanks
     
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  3. Tony

    Tony

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    You can get them from the irrigation places. The whole thing won't be made of plastic but will have metal springs. I'm not fond of using them as they can clog up and give you hassles by not closing properly when the power is out
     
  4. Noodles

    Noodles

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    I got plastic non return valve, not sure what size pipe you want to connect this takes a thin pipe about a 4 to 5 mm. I'm selling them at R90.
     
  5. Boendoe

    Boendoe Thread Starter

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    Thanks, but what else can I use to stop the back flow?

    Thanks Fleur but the pipe I'm using is a 25mm
     
    Last edited by a moderator: 25 Jan 2013
  6. scubaninja

    scubaninja

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    just drill a hole in the the outlet of your return pipe just below the water line in your DT, this will stop your back siphon
     
  7. Boendoe

    Boendoe Thread Starter

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    Thanks now why didn't I think of that.
     
  8. RiaanP

    RiaanP Moderator

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    I got a garden micro irrigation plug in my return line, just above water level. The plug that goes into the 20mm pipe and where you attache the 6mm flexible pipe that goes to the sprinkler.

    BUT

    Make sure everyweek that it does not block up with salt creep or whatever. Push something into the hole and make sure it is open.

    with the plug just above water line, it always have a thin "pee" line. So I can see quickly if it is all OK.
     
  9. riyadhessa

    riyadhessa

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    Cool idea i will try this...
     
  10. Stressed Eric

    Stressed Eric

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    I tried the hole thing and put a 4mm hole in my 20mm return pipe just at water level - it works but eish, it doesn't break syphon quickly enough and lose a lot of water into the sump. I have a 20mm plastic NRV that came with a Prominent dosing pump that I'm going to try in addition.

    If the hole method doesn't work for you maybe give prominent pumps a shout, think there's a dealership in GP
     
  11. JD167

    JD167

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    Does the hole just below the water line word to prevent too much water from siphoning back into the sump? I currently have this problem. My sump won't be able to take all the water that gets siphoned back.
     
  12. RiaanP

    RiaanP Moderator

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    Check my syphon break
    Return Syphon Break - Pumps and Waterflow

    Immediate break. And if I do not see the pee-line, then I know its blocked. No snails parking over the hole at critical moment to block the hole.
     
  13. davidfr7

    davidfr7

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    I had a 50mm and a 25mm non return and they don't always work. The hole on the return pipe just below the water line is the best.

    If you still want a non return try water plant on Ontdekkers. If you don't come right let me know i can order for you, a 25mm NRV pvc is about +- R70.
     
  14. JD167

    JD167

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    Cool thanks! I'll try the hole below the water line method tonight.
     
  15. JD167

    JD167

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    Thanks David. Will let you know if I don't come right.
     
  16. toppdogg

    toppdogg

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    i got them in P.E for a 20mm pipe for R15.00 each and just took the spring out water forces valve closed and works lik a charm
     
  17. JD167

    JD167

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    The hole below the water line works like a charm. I have two return pipes and drilled a hole in each one. Works 100%. Now I can sleep at night knowing my sump wont overflow! :whistling:
     
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