I'm not too sure how the modified sprinkler valves actually work. So if someone could also shed some light on that as well... but my question is: what is the max PSI a modified sprinkler valve can handle before it just 'goes off'?
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Max PSI
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SpudBlaster15
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Last edited by SpudBlaster15 on Wed Jul 14, 2021 12:41 pm, edited 1 time in total.
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storm33229
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Ah, well my target PSI is around 200. I've played with 120 and it's just a bit too slow for my liking. So is there any way to buy a pre modified air valve that will hold >= 200 PSI?SpudBlaster15 wrote:They are rated to 120psi, so I wouldnt go over that.
A sprinkler valve is a basic diaphram valve. When you pressurize your chamber, air bleeds through an opening in the diaphram, into the "cavity" in which your blow gun is mounted. A much larger surface area is exposed on this side of the diaphram, causing it to seat against a stop, sealing off airflow through the barrel. When you actuate the valve, (sqeeze the blowgun) you dump all the pressure on that side of the diaphram in a fraction of a second, and because the air pressure on the other side is now large enough to overcome the surface area deficit, the diaphram is pushed upward, enabling the air to flow into the barrel.
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squeaks
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#1 where are you getting a compressor that goes up to 200?
#2 Few people sell them that are rated to that high. You're better off making your own out of sch 80 pipe and sch 80 fittings.
#2 Few people sell them that are rated to that high. You're better off making your own out of sch 80 pipe and sch 80 fittings.
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storm33229
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Well, I've yet to look for a compressor that goes that high...I was kinda assuming that home depot would have one; if Sch. 80 PVC 1/4" can hold around 600+ PSI, then I was assuming that there would be a air compressor that would pump up to 200 PSI. But yeah, I guess I might have to stick with 120 PSI then... Main reason for that is because I really don't want to have to construct my own air valve.squeaks wrote:#1 where are you getting a compressor that goes up to 200?
#2 Few people sell them that are rated to that high. You're better off making your own out of sch 80 pipe and sch 80 fittings.
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sergeantspud2
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Your going to have a problem finding a 200psi air compressor. But 120 is more than enough to give you sufficient power to a pnuematic cannon.
Always rely on Murphy's Laws 4.If you have enough grease & a big enough hammer, you can put anything... anywhere
3.If all else fails, hit it with a big hammer
2.Matter will be damaged in direct proportion to its value
1.If anything simply cannot go wrong, it will anyway
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squeaks
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Well, it depends on your chamber and barrel size. If you have a 1' long gun you aren't going to get a lot of power.
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sergeantspud2
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Thats why there isnt much of a point for making mini pnuematics... you dont see pill bottle pnuematics (not pill bottle but similar in size chamber) pnumatics are designed to be BIG! 
Always rely on Murphy's Laws 4.If you have enough grease & a big enough hammer, you can put anything... anywhere
3.If all else fails, hit it with a big hammer
2.Matter will be damaged in direct proportion to its value
1.If anything simply cannot go wrong, it will anyway
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storm33229
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Chances are that I will be shooting 1/4" or 1/2" marbles out of a 3/4" ID x 2' barrel @ around 120-125 PSI.squeaks wrote:Well, it depends on your chamber and barrel size. If you have a 1' long gun you aren't going to get a lot of power.
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squeaks
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yeah, just get like a 1.5' 2" chamber. Should work good, I think.
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SpudBlaster15
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Last edited by SpudBlaster15 on Wed Jul 14, 2021 12:41 pm, edited 1 time in total.
my sprinkler valve has a max of 150psi...you can buy it an any hardware store for like 15 bucks....I didn't even mod mine i just used it how it is and used 3 nine volt batteries with 2 switches to make it have an electric trigger. Works PERFECTLY!!
If you have pipe to take this 200psi pressure you're after then use a QEV.
I'm using one at 160psi in my copper design that ought to be done by this weekend
A few hand/foot pumps go up to 200psi. I'm sure the track pump I've got can do that but the gauge stops qat 160psi and its not a good idea to keep going past it in my opinion
I'm using one at 160psi in my copper design that ought to be done by this weekend
A few hand/foot pumps go up to 200psi. I'm sure the track pump I've got can do that but the gauge stops qat 160psi and its not a good idea to keep going past it in my opinion