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Check valve piston?

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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Check valve piston?

Unread postAuthor: sharpshooter11000 » Fri Nov 04, 2011 8:25 am

I've been thinking of designs for a piston for a co-axial pneumatic and I haven't found anyone using a check valve in the piston to fill the chamber rather than letting the air seep around the sides. Is there a reason for nobody using this idea? Thanks :)
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Unread postAuthor: pneumaticcannons » Fri Nov 04, 2011 8:32 am

People have done this but usually just drill little vent holes in their pistons because check valves add weight and are just one more thing to break in you're gun... good luck on you're launcher :wink:
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Unread postAuthor: sharpshooter11000 » Fri Nov 04, 2011 8:38 am

Ahh that makes sense, I might put a bit of rubber over the end of the vent hole instead of a check valve. Also do most people make co-axial's servicable?
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Unread postAuthor: Technician1002 » Fri Nov 04, 2011 9:23 am

Serviceable is pretty much a requirement for piston valves. They need bits of spuds cleaned out, dried sticky apple sauce removed, re-lubricated, etc.
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Unread postAuthor: sharpshooter11000 » Fri Nov 04, 2011 9:42 am

Would I still need to if I'm using foam rounds for it? It would be possible for me to unscrew the pilot valve at the back and spray in a bit of silicon spray to keep it lubricated.
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Unread postAuthor: pneumaticcannons » Fri Nov 04, 2011 10:14 am

I would still make it serviceable. My big co-ax would have been in the trash by now if I hadn't had made it serviceable... I've had to replace the rubber washer 2 times and even remade the entire piston once. BTW why are you going to shoot foam rounds? lol
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Unread postAuthor: sharpshooter11000 » Fri Nov 04, 2011 10:54 am

I've just come up with an idea to make it look like I wanted and still be serviceable :D I'm using foam rounds for use against vehicles in airsoft, I'll end up using other stuff as well for destruction though :twisted:
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Unread postAuthor: Gun Freak » Fri Nov 04, 2011 2:04 pm

People use check valve pistons all the time... How could you not find one?
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Unread postAuthor: sharpshooter11000 » Fri Nov 04, 2011 3:18 pm

All I could find were piston check valves, I mustn't have been looking in the right places :?
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Unread postAuthor: FighterAce » Fri Nov 04, 2011 3:49 pm

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Unread postAuthor: sharpshooter11000 » Fri Nov 04, 2011 4:01 pm

Ah, no but that's exactly what I was looking for, thanks :wink: I think I'll drill a hole and use part of the sealing face as a closing flap
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Unread postAuthor: Gun Freak » Fri Nov 04, 2011 4:37 pm

All I could find were piston check valves

I thought that was what you were looking for.

That last post sounds like a good idea.
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Unread postAuthor: sharpshooter11000 » Fri Nov 04, 2011 4:57 pm

Yeah, sorry my wording wasn't very good. I meant a piston with a check valve to equalise pressure in the chamber. I think I'll just do the sealing face flap, it'll be like a simple, lightweight check valve.
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Unread postAuthor: Gun Freak » Fri Nov 04, 2011 5:23 pm

That's what all piston check valves do.
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Unread postAuthor: sharpshooter11000 » Fri Nov 04, 2011 5:27 pm

Oh... :oops:
I've looked on google and cant seem to understand... is it kind of like a one-way piston vlave?
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