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Homemade Valve

But will it work?

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#1 Flaming Hilt

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Posted 20 August 2006 - 11:37 AM

Inspired by Bolt's BS-7 valve (pic).

I currently have the ambition of making a 100% homemade pump gun (no store-bought valves or pumps). To jump to the point, here's what I've come up with for the valve:
Posted Image
As you can see, it is a rather simple design (simpler even than this one, I believe). The only real trouble would be getting the O-ring glued in place; although it wouldn't even have to be exact center. And holes would have to be drilled to the exact diameter of your firing pin, of course.

Anyways, I was wondering just whether or not an O-ring and a Neoprene washer would be able to make an airtight seal with one another. I was also thinking it might be possible to do with just a Neoprene washer, as this is what Hasbro appears to use (if you've ever looked down one of their valves).

It would of course require some lubrication; the tigher the fit, the less lubrication required.

The good thing is that the spring is in the perfect position to push the washer against the O-ring if there's no pressure to do so, so the valve will always be sealed (ever had a gun not seal until you pump it up halfway?).

Questions, comments, suggestions... anything else -- all welcome.
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#2 Powersniper

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Posted 20 August 2006 - 01:30 PM

They look like good I deas but it's like the titan, where the pin is, that is attached to the trigger, some air would leak out. Otherwise... I would think that it would just be kind of a bitch to build.

Edited by Powersniper{}, 20 August 2006 - 01:30 PM.

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#3 Flaming Hilt

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Posted 20 August 2006 - 04:00 PM

Why so? Get two endcaps, slap them on some 1/2", drill a hole for your firing pin, glue/somehow-attach the washer, lubricate, and you're done.
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#4 m15399

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Posted 20 August 2006 - 05:06 PM

You're going to have a hell of a time getting a seal between the trigger rod and the valve casing. I would suggest putting an oring around the trigger rod, then putting it into a smaller pipe.

Your rear trigger might not work, because the pressure might push the trigger back if the seals weren't quite perfect, but the first one is a good design.
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#5 davidbowie

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Posted 20 August 2006 - 06:28 PM

I think your valve is asleep.

The front-trigger looks alright. It would probably lose some air around the button when opened, just because of how bothersome that seal is going to be, but it shouldn't be a huge issue.

The rear-trigger, however, could be a bit of a problem. The operating rod seal would have to hold pressure perfectly, instead of just keeping the leak low.

I might look into this a bit myself. I've been looking for an air equivalent of the clothespin trigger (cheap, simple, universal, easy to build) for quite some time now.
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#6 Doom

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Posted 20 August 2006 - 06:56 PM

I might look into this a bit myself. I've been looking for an air equivalent of the clothespin trigger (cheap, simple, universal, easy to build) for quite some time now.


This is so easy I feel bad to explain it. Something I'm surprised no one has done.

When my brother made his first Nerf homemade, he used O-rings. It worked well, but was difficult to make. There's something easier. It's called rubber sheeting. Cut a circle of it out and it seals against PVC fairly well. You can redesign Dr. Nerf's valve to use it and construction is as easy as threading a bolt through a rubber sheet.

I'd make this myself, but I don't make Nerf homemades any longer. That and I'm poor.
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#7 sam

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Posted 20 August 2006 - 09:40 PM

I thought about doing this too. The valve design on Zero's homemade valve looks pretty simple. I would just start with that, and then change it form there. Figure out what works and what doesn't and change it on your next valve.

What were you planing on using for your valve between your homade pump and your homemade valve?
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#8 davidbowie

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Posted 21 August 2006 - 03:29 PM

threading a bolt through a rubber sheet.


I already use this for pretty much everything I can. The thing is, I want a main seal that will not leak, period, and won't need lube. For that, nothing beats two sealing faces pushing on each other.
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