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chamber sealing piston without o-rings

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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chamber sealing piston without o-rings

Unread postAuthor: Lockednloaded » Sun Apr 18, 2010 11:35 pm

I'm going to dive right into this with no back story about how i figured it out, so here i go...

when you consider a normal barrel sealing sprinkler valve, technically what you have is a piston attached to a diaphragm. this diaphragm is air tight so an equalization hole is necessary in order it air to get into the chamber, but what if we plugged this one and drilled a new EQ hole through the center of the piston?
the positions of the chamber and the barrel would be switched! So this idea could also be implemented in a homemade piston, all you need is a diaphragm clamped in a union the flexes with piston or just an EQ hole leading into the barrel, and there you have it... chamber sealing piston valve with no o- rings! :idea:

Whadda ya'll think? will it work, will it be effecient, most importantly though, am i the first to come up with this :lol: ?
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Unread postAuthor: Technician1002 » Sun Apr 18, 2010 11:58 pm

Or even simpler is to buy a valve of that configuration. They are the ones with the electric solenoid in the center of the diaphragm instead of the side.
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Unread postAuthor: Lockednloaded » Mon Apr 19, 2010 12:04 am

i am aware that there are chamber sealing SVs, but the SV idea was just to get my point across in a way most pneumatic builders could visualize.
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Unread postAuthor: iknowmy3tables » Mon Apr 19, 2010 7:50 am

the chamber sealing sprinkler valves are the ones with the guide rod.

this isn't exactly a new idea, people have though of it before but there's not many situations where it's practical. here's a situation where there was a decent reason to attempt a chamber sealing diaphragm, however as you can see, obtaining the right diaphragm thickness and seals properly is quite challenging
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