ball valve

Discussion in 'Trader's corner' started by dutch_slingshot, Feb 11, 2014.

  1. dutch_slingshot

    dutch_slingshot Just a Dutch guy

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    i need a ball valve to make a spud gun, but i need a pvc one. at my local stores they dont sell 'em so i thought id trade with one of you guys, if one of you has one!
    paul
     
  2. Withak

    Withak aka Whitehawk!

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    Have you tried ordering one online? I know I can do that here in the states pretty easily. And a trade might be costly based on shipping alone.

    But I should also ask - does it have to be PVC? I would think you can use some PVC threaded adapters, wrap the threads in with thread tape and use a metal ball valve? I've had to connect PVC to metal before. If you can't find the PVC ball valve, that might be a simple solution as long as those PVC threads are well seated in the ball valve threads.
     

  3. Flipgun

    Flipgun Well-Known Member

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    Look in the garden center with the hoses and spray nozzles.
     
  4. BoyntonStu

    BoyntonStu Member

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    I suggest that you consider using a self made valve as I used in my air rifles.

    Use a used tire/bike valve to fill it.

    Easy to make, cheap, and better performing than a ball valve.

    [ame]http://youtu.be/qku0i8LqZws[/ame]
     
  5. jnmbhj

    jnmbhj Slingshots FTW

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    I Don't get it, how can the locking valve also be the trigger? Don't you need to valves to operate it? One for locking in the pressure and another one for releasing the pressure into the barrel to fire the projectile.
     
  6. BoyntonStu

    BoyntonStu Member

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    This video might help.


    https://www.youtube.com/watch?v=apSA_ny8DgM
     
  7. jnmbhj

    jnmbhj Slingshots FTW

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    Oh ok thats how it works thanks
     
  8. Ghosth

    Ghosth Over the hill but still swinging!

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    Just exactly what are they calling spud guns these days?
    In my day it was a PVC single shot potato shooting cannon normally fueled with hairspray or starting fluid. No high pressure air involved.

    You don't need a ball valve to make a spud gun, in fact better to use a cleanout fitting with screw threads for easy access.

    If your smart you'll get that cleanout in 3" or 4" along with an adapter from whatever size you chose down to 2" for barrel.

    Cleanout, short piece of pipe and adapter make a combustion chamber, being bigger, it can hold more fuel, and air, and deliver a bigger kick to the barrel.

    Gas grill spark ignitors are good for ignition and only need a couple of very small holes to run a wire into the chamber.

    Hair spray is good fuel, although Ether is very good (engine starting fluid)

    Best I've seen was a setup that hooked directly to an Acetylene torch tank setup. They set the valves till the flame burned perfect, then shutoff at the tanks, disconnect the torch itself, fed Acetylene and oxy directly into the combustion chamber, then spark. BOOF and another potato took off across the river.

    But that was plumbers, those guys (union) have time to kill and cool tools to play with.

    Anyone see the Wild West Alaska version where Bryan and Fred built an potato cannon to win a snowball contest? Pretty cool stuff. They didn't show what they were fueling it with, but it looked like hairspray can to me.
     
    Last edited: Mar 17, 2014
  9. BeMahoney

    BeMahoney Builder of things

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    removing the "s" from https://www.youtube.com/watch?v=apSA_ny8DgM makes the clip "visible":

    [ame]http://www.youtube.com/watch?v=apSA_ny8DgM[/ame]
     
  10. BoyntonStu

    BoyntonStu Member

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