Multi Shots out of 100psi Tank

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duwem
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Fri Jan 22, 2021 10:55 am

Image[/img][/img]Working on a cannon that needs to shoot foam stress balls 30’ at targets. I have found it takes about 60psi to propel the balls that far with my small secondary tank.

Only have 30 seconds to get the most targets possible.

Right now I have a 10 gallon tank at 100psi with a pressure regulator feeding a second tank at 60psi. I can get about 10 shots before the 100 psi is too low to build 60 in the second small tank.

But it’s a bit clumsy as I need to shut a ball valve between the big and small tank each time I fire or it will drain the large tank on that shot. I could replace this with a sprinkler valve with solenoid to automate it some.

But , is there an easier/simpler way to get 10 shots out of the tank without extra valves and the praise regulator???

PS I do own a lathe and can make some simple things on it.
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farcticox1
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Sun Jan 24, 2021 7:15 am

Have you tried a smaller chamber? that would reduce the volume used each shot.
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jackssmirkingrevenge
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Sun Jan 24, 2021 9:17 am

If you leave the main tank open and just squeeze the pilot blowgun very quickly, does it dump the whole tank or does the sprinkler valve re-close?

Using a momentary valve is a much more efficient way of going about multiple shots than filling and dumping a firing chamber.

I went into the theory here: viewtopic.php?f=26&t=26916

I'm not sure a sprinkler valve will work in this application, assuming they re-close fast enough then having a momentary pilot would be one of the best solutions, without the need for a secondary air tank.
hectmarr wrote:You have to make many weapons, because this field is long and short life
duwem
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Sun Jan 24, 2021 1:37 pm

why does every post need approval, wow!!
Last edited by duwem on Mon Jan 25, 2021 1:35 pm, edited 1 time in total.
duwem
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Sun Jan 24, 2021 2:05 pm

If I leave the ball valve open it does dump a bunch of air out of the main tank. Will take a look at that link.
duwem
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Sun Jan 24, 2021 2:06 pm

Yes having the ball valve open does dump a bunch of air from the main tank on each shot.

I will take a look at the link
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jackssmirkingrevenge
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Thu Jan 28, 2021 2:34 am

duwem wrote:
Sun Jan 24, 2021 1:37 pm
why does every post need approval, wow!!
It only applies to your first few posts to filter out new users that join only to spam.

You should consider replacing the sprinkler valve with a QEV:

Image

You can poke a small hole in the edge of the piston to refill the pilot volume and it will reset rather quickly if used with a momentary pilot.
hectmarr wrote:You have to make many weapons, because this field is long and short life
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farcticox1
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Thu Jan 28, 2021 5:39 am

My videos got age restricted :|
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jackssmirkingrevenge
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Fri Jan 29, 2021 7:55 am

farcticox1 wrote:
Thu Jan 28, 2021 5:39 am
My videos got age restricted :|
boooo...

Image
hectmarr wrote:You have to make many weapons, because this field is long and short life
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mrfoo
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Fri Jan 29, 2021 12:21 pm

Well that's bad advice. I let people know I was thinking of the children and I ended up on a shortlist.
duwem
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Sat Jan 30, 2021 2:52 pm

What does the qev gain me over the sprinkler? Better flow? Faster opening?
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jackssmirkingrevenge
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Sun Jan 31, 2021 9:07 am

mrfoo wrote:
Fri Jan 29, 2021 12:21 pm
I let people know I was thinking of the children and I ended up on a shortlist.
Surprised that stood out on the continent :roll: :D
duwem wrote:
Sat Jan 30, 2021 2:52 pm
What does the qev gain me over the sprinkler? Better flow? Faster opening?
Probably less flow and faster opening, but most importantly, faster closing.

Instead of needing a separate firing tank that you empty for every shot, you take small sips of air from the main tank instead.

This will give you significantly more shots per tank.

Here is one of my early tests with a home-made QEV and schrader valve as a pilot:



The valve reclosed as soon as the pilot was released.
hectmarr wrote:You have to make many weapons, because this field is long and short life
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farcticox1
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Sun Jan 31, 2021 9:50 am

I fill mine through the trigger valve which closes when fired so it can only dump air tfrom the chamber.
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