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Homemade Check Valve


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#1 nerfturtle

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Posted 09 July 2007 - 08:24 PM

I was walking through the hardware store yesterday, looking for check valves for a first homemade. When I actually found one, I no longer wanted to get one. 10 dollars! really, that is NOT worth it, so I came up with a plan to make one for myself, and after searching the haven for similar ideas, I found none. So, I give to you, The Homemade Check Valve.

Materials.
-3\4" ID PVC
-1\2" ID Acrylic*
-3\8" ID Acrylic**
-Longshot barrel extension*
-3\8" ID O-ring*
-6\8" marble*
-6\8" long spring
* These are just the materials I had on hand, but they can be subsituted for with many other things.
**Optional, this depends if you spring is thin or thick. if your spring is thicker than 3\8", then you will not need this piece.
Here is a pic of all your materials laid out.
Posted Image
We first need to cut our materials to length. Cut the PVC to 2 inches, the 3\8 Acrylic to half an inch, and for the 1\2 Acrylic and the longshot barrel we will need two sections each at half an inch. Here is a picture of your cut tubing.
Posted Image
Now, take the 3\8 Acrylic, put a thin layer of epoxy on the outside, and shove it into the 1\2 Acrylic. This is not necesary if your spring can rest on the 1\2 acryic, but if you are using a thin spring, like me, you will need to do this. It should look like this.
Posted Image
Time for the spring. Mine was really, really thin, so I needed to flare it so it was big enough to rest on the 3\8 Acrylic. If you have to flare it like I did, just use some needle nose pliars, grab the end of the spring, and pull out. This will nicely give the spring a flare.
Posted Image
Now, glue the marble to the spring. If you flared your spring, glue the marble to the non-flared side.
Posted Image
Nw, take your pieces of Acrylic and epoxy them into the pieces of LS barrel, then epoxy the O-ring and the spring\marble to the corresponding pieces(the O-ring to the 1\2 Acrylic, and the spring, if necesary, to the 1\2 and 3\8 piece). It should look like this.
Posted Image
Final step, just lube up the O-ring and marble, and epoxy those two pieces into the 2" section of PVC so that the marble is in the O-ring seat with the spring at about half tension. So, the air coming towards the "in" side will push the marble back and let air through, and then the spring wll push the marble back. If air comes toward th "out" side will just be stopped by the marble. Here's one final picture for clarification.
Posted Image
Hope this is clear enough for everybody, If not, I'm happy to answer questions.
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#2 The Crackerjack Man

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Posted 09 July 2007 - 08:49 PM

Thats great! I haven't seen anything like it. Now lets it in use on a homemade.
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#3 Cennipe

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Posted 09 July 2007 - 09:19 PM

Wow, I never would have thought of that, and it is so simple.
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#4 foamforce123

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Posted 09 July 2007 - 10:24 PM

So this thing works, right? INGENIOUS!!!!! I'm going to try that on my next homemade! Awesome! :(
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Deal wit it.

#5 NerfFreak

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Posted 10 July 2007 - 09:05 AM

Wow, a homemade valve. Those are actually usually harder to make then any other component of an airgun.

Great work.
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Nuckin' Futz

#6 Flaming Hilt

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Posted 10 July 2007 - 12:46 PM

Very nice. I kept on trying to do this myself but could never find any spheres around. Quite genius of you to use a marble...
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#7 nerfturtle

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Posted 10 July 2007 - 12:57 PM

Thanks, my first idea used only cpvc, and looked like this:
Posted Image
Similar, but then I found the marble, which I figured would be a lot easier to make.
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The tough coughs as he ploughs the dough.
-Dr. Suess

#8 bjack

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Posted 10 July 2007 - 10:02 PM

Hah for like the last 2 weeks i was trying to figure out how to make a good working check valve and i finished mine right before this was posted. Mine used the same basic idea except i went to ace hardware and pick up a 1/2" threaded to 3/8" barbed brass fitting a 1/4" ball bearing and i used a pen spring. My idea worked well too. If anyone wants details on my check valve just let me know.
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