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Thread: One way valve

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    Platinum Lounger
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    One way valve

    I'm looking for inspiration! I'm wanting to make some sort of low pressure non-return valve to fit inline to a 12mm watering system. There will only be a few (6?) inches of water head to keep it closed. I think that any kind of tap washer would require more (clamping) pressure than that available. I've tried a little 7mm plastic bead in a molded soft silicone seat, but there's still not enough pressure to seal it. Does anybody know what minimum pressure operates a pneumatic tyre valve? Any other brainstorms appreciated.

    Alan

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    Plutonium Lounger Leif's Avatar
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    Re: One way valve

    Can you raise the head by putting in a siphon system?

    And something using a ping-pong ball keeps nudging my brain...

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    Re: One way valve

    I hadn't looked at Leif's response until I posted this but you could devise a simple ballcock valve using a ping pong ball to apply pressure against a u tube.

    Probably best explained with the following animation produced by my goodself
    Jerry

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    Re: One way valve

    Hi
    have you considered a toilet fill valve?
    Regards
    Don

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    Re: One way valve

    Here is another idea, without moving parts (apart from the ball of course)

    I was think a squash ball may do the job as it is rubber.
    Jerry

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    Re: One way valve

    Thanks for those ideas Jezza (and others). I like the idea of using buoyancy + lever arm to supply the closing force, rather than just head of water. Exactly how to utilize it is still a challenge. I need to use two - a vertical one with a few inches head of water, and a horizontal one with even less. The squash ball idea is similar to my soft silicone seat, but I think I'll still maybe nee that lever arm effect... and more thinking...

    Alan
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    Re: One way valve

    I just knew there was something I'd had that would do the job. Then I spotted one in a shop for the princely sum of $2:
    <IMG SRC=http://img.diytrade.com/cdimg/434766/7779868/0/1230816776/siphon_pump.jpg>

    I'ts a (petrol) siphon pump, hand-powered by the red squeeze-bulb. The valves (and I get two of them!) are simple "normally closed" plastic disk flaps that seal over an annular plastic seat. I think they will do the job. <img src=/S/clapping.gif border=0 alt=clapping width=19 height=23>

    Alan

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