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homemade regulators

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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Unread postAuthor: maggotman » Wed Feb 11, 2009 5:28 pm

try to find an old oxygen regulator of an oxacetalean torch it will come with a tank pressure gage and a output pressure gage
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Unread postAuthor: SubsonicSpud » Wed Feb 11, 2009 5:43 pm

maggotman wrote:try to find an old oxygen regulator of an oxacetalean torch it will come with a tank pressure gage and a output pressure gage


I have looked at them but they seem to have a max regulated pressure of around 10bar. I am looking for a regulator that can output betwen about 5 and 25 bar. The designs that Daccel and Ragnarok have posted here, particularly when an air spring is used, should be highly adjustable.
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Unread postAuthor: grumpy » Wed Feb 11, 2009 6:27 pm

@SubsonicSpud, just make sure that no oe else is close when you turn the air, i would not trust epoxy to hold at that pressure, and when it fails you will have a deadly missle going off.
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Unread postAuthor: SubsonicSpud » Wed Feb 11, 2009 6:55 pm

grumpy wrote:@SubsonicSpud, just make sure that no oe else is close when you turn the air, i would not trust epoxy to hold at that pressure, and when it fails you will have a deadly missle going off.


Trust me, I won't be useing epoxy on anything i make that is going to taking that sort of presure. I intend in useing the same style of regulation, but made of pressure rated components
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Unread postAuthor: maggotman » Thu Feb 12, 2009 5:52 am

i took an oxogen one apart ime sure you could mod it like change the spring etc. plus its already sealed up 1000psi+ always seems to find leaks somwear lol
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Unread postAuthor: sputnick » Thu Feb 12, 2009 6:28 pm

What does the scout say about the bursting pressure...

ITS OVER 9000!!!

Besides, I would never take it that high, the highest I could ever achieve would be 3000 by using a pressurized HPA bottle
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Unread postAuthor: grumpy » Thu Feb 12, 2009 7:59 pm

sputnick wrote: the highest I could ever achieve would be 3000 by using a pressurized HPA bottle


not with a hpa paintball tank you wont, you will need to get a scuba tank or scda tank.
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Unread postAuthor: daccel » Sat Feb 14, 2009 9:34 pm

Delayed due to work and epoxy failing when I was trying to thread stuff together. I reinforced it this time by putting a piece of copper pipe around it and epoxying in place.

Results were mixed. At first nothing happened, it just stayed open. Then I realized I had forgotten to lube the piston before epoxying it closed. Doh! Note to self, make v.2 serviceable.

Managed to get it moving by putting oil in by the spring and the low pressure side. Then switching the schrader filler to the low pressure side and running air backwards I was able to cycle it till it was moving freely.

Filling through the low pressure side with no spring, it would pop closed at 30 psi when pressurized quickly and somewhere between 50-60 psi when pressurized slowly.

Which means that the spring won't have enough strength to return the piston. I could use a stronger spring and run a higher pressure but that would require redesigning the hybrid to handle the higher mix :?.

The good news is that it doesn't leak at all, the o-rings are sealing perfectly!

When I switched the inlet back to the high pressure side I couldn't get it to work because my bike pump is leaking like crazy, and the greater volume didn't allow the pressure to get high enough. I'll update when I have a new pressure source.

Anyway, here's a picture of the test rig. It's a frankenstein of a previous fueling setup not completely disassembled. And the electrical tape is structural :lol:.
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