In desperate need of explanation!!
Posted: Fri Sep 05, 2008 4:23 pm
Can anyone please explain how a modded sprinkler valve works?
Earth's largest potato gun resource
https://www.spudfiles.com/
.As you can now tell, a sprinkler valve is a valve, a valve regulates or completely stops a fluid from going through a passage. In a sprinkler valve this is done by the 'diaphragm'. When you fill your chamber up with air, the air leaks through an 'equalization' hole in the diaphragm and into the 'pilot volume'. This air pressure in the pilot volume then pushes the rubber diaphragm down and seals the hole to the barrel.
So now the pressure can build up in the chamber while the diaphragm is sealed against the barrel port in the valve. A sprinkler valve usually uses a 'solenoid' to empty the pilot volume, but us Spudders find that solenoids are too slow and restrict flow, meaning the valve opens slower. You also need 3x9v batteries to operate them.
So instead we use a blow gun, this does the same job except it's pneumatic and not electric like a solenoid. When you mod the valve so the blow gun is above the pilot volume area, the valve in the blow gun holds back the pressure in the pilot volume keeping the valve sealed.
Once you press the trigger on the blow gun, it opens the valve in the blow gun, letting the air pressure in the pilot volume out, this creates an unequal force on the diaphragm, which now has pressure from the chamber pushing it up, but no pressure holding it down, so the diaphragm opens very, very quickly, letting the air out into the barrel port, and firing your projectile
He asked how it works, not how to make one.nivekatoz wrote:Its simple....Im not sure if I can explain it good but I'll try..First take out the solenoid. Second fill the solenoid hole with epoxy..third find the center of the valve and drll a hole a bit smaller than the hole...Than tap with 1/4 or 1/8" threads depending on what you need or want.. Than screw in a blow gun or what ever your you use for a trgger... :drunken:
Your dad has got the right idea.I didn't understand how it works, and my dad refused to take me to buy parts until I explained it to him.
Yes? I'm still doing my degree, so I'm an engineer in training.jackssmirkingrevenge wrote:"The Engineer In Training"
Nah, you aren't an Engineer in Training until you pass the EIT.Ragnarok wrote:Yes? I'm still doing my degree, so I'm an engineer in training.jackssmirkingrevenge wrote:"The Engineer In Training"
You'd be surprised what can be done with limited tools. Other than a basic tool kit, the only thing I have outside of that is a blowtorch and Dremel really.The Engineer wrote:but have very limited tools, which is a problem...
I must really be in the mood to bust your balls.... 'Cause I read that and all I can think is that you probably don't actually have a blowtorch. And if you do? Don't use it, that things a collector's item (how much would you want for it?)!Ragnarok wrote:I have outside of that is a blowtorch and Dremel really.
Actually by that time he'd acquired a small milling machine but nevertheless he does some smashing stuff and did so even before that.Ragnarok wrote:...one of the most impressive things I've yet seen is Candyman's site:The Engineer wrote:but have very limited tools, which is a problem...
http://www.ukmonsters.co.uk/dsr1/dsr1.htm
He doesn't have too much in the way of specialist tools, (and most those he does have you could do without were you careful and generous with the ingenuity) but he gets stunning results...
Yeah, but I just pulled out the first link I found. Besides, with enough effort, I think you could manage it without the mill.Hotwired wrote:Actually by that time he'd acquired a small milling machine but nevertheless he does some smashing stuff and did so even before that.