My CO2 Manifold Question

[ChefTyler]

Ok, did a quick search, didn't find what I was looking for.
I want to plumb a 1-4 manifold to my CO2 tank in the back hatch area of my Xterra, so that the 4 outlets w/QDs are near each wheel for quick simultaneous inflation of my tires.
Here's the problem, I need a way to actuate a valve when the manifold pressure reaches a certain (variable depending on the tires I'm running) PSI. What I need is exactly like a pressure solenoid on an air tank to shut off a compressor, but obviously I have no compressor, so it would have to trigger a valve of some sort to stop the flow of CO2. I've looked at McMaster Carr and can't find what I'm looking for.
I'd rather NOT spend a fortune on this, and I realize this isn't likely to happen, but I figured I'd utilize the knowledge base out there.

TIA.

[Alex Topousis]

http://assuredautomation.com/VA/index.php
That might work you would need a pressure sensor then also. I'm not sure on the price

[Eric P]

Why not get an adjustable regulator? You set it to the tire pressure you want & let the CO2 flow. Once the tire pressure is at your setting, the pressures are equalized and the CO2 flow stops.

[ChefTyler]

I've got an adjustable regulator on my CO2 setup now, but the flow @ 35ish PSI sucks, and would negate the benefits of a high flow CO2 setup. But you're right, I'm making this too complicated :D

[nissandoms47]

So you're trying to do something like this but with out the compressor?

http://www.4x4parts.com/ubbthreads/showflat.php?Cat=0&Number=540825&page=0&fpart=1&vc=1

[ChefTyler]

That was my inspiration in fact :D

[nissandoms47]

Ah, ya its a sick setup.

[Eric P]

I know what you want & can find one for a 120V system. It is an electric switched used in aquariums to regulate the PH with CO2. Instead of a ph meter, you would use a pressure meter.

http://www.co2-canisters.com/

[ChefTyler]

hmmmmmmmm...that would work perfectly, if it weren't 120 :(