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Where to find check valves?

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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Where to find check valves?

Unread postAuthor: acs2997 » Sat Jan 12, 2013 10:00 am

Hello all,
I'm trying to find small check valves that I can put into a 2" piston, but everywhereive gone, the check valves are larger than my actual piston.

Does anyone know where I can find small check valves?
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Unread postAuthor: jackssmirkingrevenge » Sat Jan 12, 2013 10:06 am

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Unread postAuthor: acs2997 » Sat Jan 12, 2013 10:11 am

Where would I find something like that? That's pretty much exactly what I need. Wait, isn't that the valve used on bikes? Maybe I'm wrong but that's what's used on racing bikes
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Unread postAuthor: jackssmirkingrevenge » Sat Jan 12, 2013 10:15 am

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Unread postAuthor: acs2997 » Sat Jan 12, 2013 10:20 am

Thanks! Yeah, my friends dad does a lot of cycling, I'm sure I can get one from him. Thanks, I never would've thought to use one of those.
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Unread postAuthor: jackssmirkingrevenge » Sat Jan 12, 2013 10:25 am

You could also use a schrader instead of a presta, but because of its internal spring you will have significantly lower pressure in the chamber than in the pilot (assuming you want this for an o-ringed piston).
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Unread postAuthor: acs2997 » Sat Jan 12, 2013 10:54 am

Yeah, I'll probably go with the presta. How fast will it beagle to fill up e air chamber? Will it significantly restrict how fast it fills? I'm trying to make a semiauto gun, and I want the rate of fire as high as possible
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Unread postAuthor: jackssmirkingrevenge » Sat Jan 12, 2013 12:47 pm

acs2997 wrote:How fast will it beagle to fill up e air chamber? Will it significantly restrict how fast it fills?


Pretty fast :)

[youtube]http://www.youtube.com/watch?v=Q72dTEM1whM[/youtube]

Depends on the size of your chamber, a largish one might take a couple of seconds to fully pressurise.
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Unread postAuthor: acs2997 » Sat Jan 12, 2013 12:59 pm

I'm only shhooting paintballs, I'm not Punkin Chuckin here. The air chamber is about a foot and a half of 2" pvc. Thnk thats a god size?

Btw, I love the video :wink:
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Unread postAuthor: Brian the brain » Sat Jan 12, 2013 2:59 pm

God size would be slightly bigger.

A rubber flap over a tiny hole will work as a checkvalve.
Assuming the sealing face will be made outof a sheet of rubber...all you would need is a tiny hole on the side, between the seat diameter and the outside.

have the rubber sheet cover the entire front of the piston....and drill...
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Gun Freak wrote:
Oh my friggin god stop being so awesome, that thing is pure kick ass. Most innovative and creative pneumatic that the files have ever come by!

Can't ask for a better compliment!!
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Unread postAuthor: mark.f » Sat Jan 12, 2013 6:46 pm

If your piston is o-ringed (and actually seals in the carriage), you probably don't want a completely airtight check valve too. Leaving it charged, a small leak in the pilot could reduce pilot pressure enough to fire accidentally.

Clide (a user on these forums) made check valves using a male-female adapter and plug, a small spring, and an airsoft bb for this exact purpose.

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Unread postAuthor: acs2997 » Sat Jan 12, 2013 6:57 pm

Is that in his slider?
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Unread postAuthor: mark.f » Sat Jan 12, 2013 6:59 pm

No, it's the Straight Through Valve (inline piston valve). But he used them on a lot of his barrel sealers.
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Unread postAuthor: acs2997 » Sat Jan 12, 2013 7:17 pm

Alright. I'll play around with it a little bit, I'll see what works and what doesn't. Thanks for the input, I've had an experience with accidental firings, not exactly the best day in my life
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