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Easy DIY regulator

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Easy DIY regulator

Unread postAuthor: MRR » Sun Jan 10, 2010 3:01 pm

After watching some diagrams about regulators I decided to make my own.

The following device is based upon this little diagram:
Image

My regulator operates the same like in the diagram but instead of a diaphragm I used a little squeeze piston (two gaskets on a screw squeezed to fit) and a presta valve at the gas inlet.
Image

Image

The spring rests on a little 12mm ball bearing, this way the plug turns very easy to set the force.
Image

I was able to regulate my shop compressor between 8 and 0.5 bar.
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Last edited by MRR on Tue Jan 12, 2010 6:22 am, edited 1 time in total.

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Unread postAuthor: Jack_Hogg » Sun Jan 10, 2010 3:08 pm

Very nice, I like it when people try new things, it also will save you a few bucks :) I am also thinking of making something like that, but not a regulator, but a safety valve for my fridgecompressor, so it won't go over 40 bars and destroy my pressure gauge. Anyway... I like it alot!
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Unread postAuthor: POLAND_SPUD » Sun Jan 10, 2010 3:37 pm

cool I've been looking for something like this... moar details please


@jack_H
that's actually quite simple... all you need is a piston with a strong spring behind it... or a shrader valve with a much stronger spring
it's better than a pop-off valve as it won't vent the whole system
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Unread postAuthor: far_cry » Sun Jan 10, 2010 7:36 pm

good job
try it on high pressures
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Unread postAuthor: JDP12 » Sun Jan 10, 2010 8:57 pm

Yes please more details!!

Excellent job I would love to see if this would work around 800 psi or so
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Unread postAuthor: theBOOM » Sun Jan 10, 2010 11:31 pm

Good job good way to save some money for other stuff... do you happen to know how much pressure that 1/2" Tee can take?
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Unread postAuthor: inonickname » Mon Jan 11, 2010 2:12 am

800 psi wouldn't be out of the question for a 1/2" brass tee, so it could regulate CO2 if made well.
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Unread postAuthor: Solar » Mon Jan 11, 2010 2:42 am

inonickname wrote:800 psi wouldn't be out of the question for a 1/2" brass tee, so it could regulate CO2 if made well.



Depends on the brass.
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Unread postAuthor: psycix » Mon Jan 11, 2010 4:16 pm

What a beauty! :D
I might build one too in the next few months. However, I'd equip it with a (homemade or not) safety popoff, so if the regulator would fail to seal, it won't fill the devices behind it with unregulated pressure.
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Unread postAuthor: Brian the brain » Mon Jan 11, 2010 4:17 pm

Seeing this design ( I am very tired right now, so I might be wrong) I think it does not have a pressure independant piston.

Meaning..it will regulate up to a certain maximum point. Once the input pressure is raised above this critical point the valve won't be able to re-open the inlet channel.
This is because it works by sliding off the shrader.Imagine the input pressure raising beyond the maximum the spring can open.
It will stay shut.

BUT:

If you combine this idea with the pushbutton valve, you will have a true regulator.It will pull the valve shut when the low pressure side has reached it's max.Not matter what the input pressure will be, it will re-open once the low pressure side drops...
Only important thing is to make the low side piston larger than it's counter piston.

Put the spring behind the counter piston ( formerly the pushbutton)

Good to finally see someone take the effort of building a homemade reg, but as I have said before, the pushbutton principle is much better suited for it.
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Oh my friggin god stop being so awesome, that thing is pure kick ass. Most innovative and creative pneumatic that the files have ever come by!

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Unread postAuthor: MRR » Tue Jan 12, 2010 6:39 am

It's true that the design has no pressure independent piston, that's why I took a presta valve with a very small opening surface. The way it is, the construction isn't that strong anyways.
It's more like a prove of concept, something you can build up on.

I've thought about the dilemma of the maximum pressure input and have already ideas to solve that problem. It's just a matter on how to build it with my recourses and without making it to bulky.
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Unread postAuthor: velocity3x » Tue Jan 12, 2010 8:28 am

inonickname wrote:800 psi wouldn't be out of the question for a 1/2" brass tee, so it could regulate CO2 if made well.


Considering the force exerted by high pressure on the surface area of the diaphragm, I don't think it can achieve high pressure output using anything less than a large, powerful die spring (or equivalent) on the low pressure side of the diaphragm.
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Unread postAuthor: inonickname » Tue Jan 12, 2010 10:23 am

velocity3x wrote:
inonickname wrote:800 psi wouldn't be out of the question for a 1/2" brass tee, so it could regulate CO2 if made well.


Considering the force exerted by high pressure on the surface area of the diaphragm, I don't think it can achieve high pressure output using anything less than a large, powerful die spring (or equivalent) on the low pressure side of the diaphragm.

An air spring is always an option.
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