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pop-off piloted sprinkler valve?

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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pop-off piloted sprinkler valve?

Unread postAuthor: jackssmirkingrevenge » Thu Jan 17, 2008 12:30 pm

would it work?
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Unread postAuthor: LikimysCrotchus5 » Thu Jan 17, 2008 12:32 pm

If the flow is enough, yea
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Unread postAuthor: Hubb » Thu Jan 17, 2008 12:38 pm

Agreed with above. I don't see why it wouldn't work to make an automatic launcher, however, I would think it would need a fast filling air supply, such as a regulated CO2 / HPA setup.

I was looking through some old files the other day and Dr's hybrid had something like that on it. I don't know if it is exactly what you're talking about but it's close.
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Unread postAuthor: bluerussetboy » Thu Jan 17, 2008 1:15 pm

i have an air compressor that runs nonstop. it has several "pop offs".

the first actuates at outlet pressure and bleeds off excess air until pressure drops below outlet pressure(ie. someone use a nailgun).

the second and third basically do the same thing just at different psi.

the second valve opens at 150 psi and closes at 135 psi.

the third(two actually, one on each tank) opens at 210 psi and have to be manually reset. it has happened twice since i've own this.

obviously the first one wouldn't work. you would get to a point and it would just bleed off the excess air while maintaining the pilot volume.

the second one would work better but once the pilot volume dropped to 135 psi the valve would close. is a 15 psi pressure differential enough let the sprinkler valve release enough air?

the third would work great. you would just have to reset it each time.
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Unread postAuthor: ALIHISGREAT » Thu Jan 17, 2008 2:03 pm

can't see why not, is this for giving a 'pulse' air supply?
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Unread postAuthor: Hubb » Thu Jan 17, 2008 2:09 pm

ALIHISGREAT wrote:can't see why not, is this for giving a 'pulse' air supply?


It's for giving something magical that he is probably working on to blow everything we know out of the water, which only he can do :wink:
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Unread postAuthor: ALIHISGREAT » Thu Jan 17, 2008 2:17 pm

hubb017 wrote:
ALIHISGREAT wrote:can't see why not, is this for giving a 'pulse' air supply?


It's for giving something magical that he is probably working on to blow everything we know out of the water, which only he can do :wink:


i just though that because he had been trying to make one for ages for an automatic he was making he may be looking at it from different angles :wink:
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Unread postAuthor: Hotwired » Thu Jan 17, 2008 2:58 pm

I'd say it would.

A sprinkler valve is literally a barrel sealing valve but with the barrel twisted 90 degrees in the moulding so it's inline.

The difference between a pop-off QEV and a sprinkler would be that the QEV can reset quickly because the inlet air is right behind the piston but the sprinkler is reset by chamber/inlet air leaking behind the diaphragm.
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Unread postAuthor: jimmy101 » Thu Jan 17, 2008 3:11 pm

The problem with a pop-off valve is that as soon as the pressure drops below it's trigger pressure the pop-off starts to close.

Depending on the details of the pop-off, it may honk and be pretty ineffective at dumping the pilot volume quickly.

You might be able to hack the valve so that it stays opened once it is opened.

The pressure release valve from a water heater might work. They typically have a pretty big ID (1/2" or 3/4"?), open at something like 100 PSI, are fairly cheap, can be manually activated, and might be available at the local hardware store.
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For a ghetto pop-off you can just drill a small hole in the wall of a standard tire pressure gauge's. :roll:
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Unread postAuthor: Hubb » Thu Jan 17, 2008 3:46 pm

Jimmy: That sounds like a better idea than using a standard pop-off. The hardware store I shop at sells them up to 1" and they come at different pressure ratings.
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Unread postAuthor: jackssmirkingrevenge » Thu Jan 17, 2008 4:12 pm

I was thinking of making my own pop-off (JSR? standard parts?! lol) a la Btb, that should work a treat.
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Unread postAuthor: jimmy101 » Fri Jan 18, 2008 12:18 pm

Jack, any thoughts on how to keep the pop-off valve open and keep it from honking?
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Unread postAuthor: Brian the brain » Fri Jan 18, 2008 12:49 pm

Guys...give it up...

A pop-off won;t cut it.
It resets at too high of a pressure to make the shots have any power.

The valve will close too quickly for this to be a succes.
There is a reason I made the Snapvalve!
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Unread postAuthor: jackssmirkingrevenge » Fri Jan 18, 2008 12:57 pm

jimmy101 wrote:Jack, any thoughts on how to keep the pop-off valve open and keep it from honking?


basically by making something similar to what Brian did
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