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400 psi valve?

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400 psi valve?

Unread postAuthor: AlbinoSpud » Tue Dec 18, 2007 6:47 pm

Do you know any really fast valves that go up to 400 psi?
I can get ball valves, but they're too slow... :?
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Unread postAuthor: cwazy1 » Tue Dec 18, 2007 6:51 pm

why not make a piston valve?? an epoxy piston would take 400psi behind it and a jbweld piston would be able to take even more..

or if you're not into making these things, you can get a qev and change the diaphragm into something stronger.

but the piston idea is much better.
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Unread postAuthor: AlbinoSpud » Tue Dec 18, 2007 6:53 pm

would a sprinkler valve take the pressure behind the piston valve? that's what I was wondering
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Unread postAuthor: BigGrib » Tue Dec 18, 2007 6:56 pm

no not at all. most sprinkler valves you would be lucky to get 250 psi. what kind of a gun are you planning on building then you can get some more in depth answers. you could try a metal piston that'd take 400 + psi
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Unread postAuthor: AlbinoSpud » Tue Dec 18, 2007 7:00 pm

I'm planning on making a metal pneumatic because I'm in snow.
So if i make a piston valve, what would i use to release the pressure?
Isn't that what you need to do? I really don't know, this is my first time making one.
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Unread postAuthor: DYI » Tue Dec 18, 2007 7:00 pm

I think he's talking about what to use for a pilot vent valve on a 400 psi piston gun. If you are talking about a pilot valve, not a main valve, do what I did: use a pressure washer handle. You can buy them relatively cheaply from McMaster, and they offer 3/8" porting and a trigger-like grip.

If you're talking about a main valve, a triggered burst disk would be the cheapest option, but not the easiest to work with. Some solenoid valves are rated for over 400 psi, but they're expensive. Apparently, high pressure QEVs (essentially piston valves with quality control) are available also, but I have no idea where one would go about obtaining such a thing - possibly a large hydraulic supply.
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Unread postAuthor: AlbinoSpud » Tue Dec 18, 2007 7:02 pm

yea I meant the pilot valve. thanks, I'll try doing that.


Edit: would this work?
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Unread postAuthor: cwazy1 » Tue Dec 18, 2007 7:10 pm

ohhh a pilot valve. well that makes things much easier..yeah that would work if u can get it to connect onto what ever your connecting it to.
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Unread postAuthor: bigbob12345 » Tue Dec 18, 2007 7:45 pm

it should work. depending on the size of the valve you are piloting it might not have enough flow but it should so try it and get back to us on if it works or not
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Unread postAuthor: DYI » Tue Dec 18, 2007 8:08 pm

it should work. depending on the size of the valve you are piloting it might not have enough flow but it should so try it and get back to us on if it works or not


Unless it is a *really* crappy pressure washer handle, it should have far more flow than any blowgun, modded or otherwise. Unfortunately, judging by the look and price tag of that handle, it may well fall into the really crappy category. Try McMaster, if you live in the states.

Also, make sure of the inlet fitting on the handle. It should be 1/4" NPT (or 3/8" for a really good one), but it would be better to know before buying anything.
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Unread postAuthor: AlbinoSpud » Tue Dec 18, 2007 8:37 pm

On mcmaster, it's like 50$ for one and that kind of my budget for the whole cannon :? so i don't know if this cheap one will work...

oh and this is kind of random, but if i use metal for the chamber, will it still explode if i use PVC for the barrel?(I'm going to use it in the snow)
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Unread postAuthor: ShowNoMercy » Tue Dec 18, 2007 8:37 pm

surpluscenter.com is your friend. :wink:
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Unread postAuthor: jackssmirkingrevenge » Tue Dec 18, 2007 10:37 pm

On mcmaster, it's like 50$ for one and that kind of my budget for the whole cannon Confused so i don't know if this cheap one will work...


What calibre were you planning on using? Because if you're careful with your pilot volume, you can successfully pilot with a schrader valve, the same one you use for filling. I've done this with a 1 inch piston and it worked great.
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Unread postAuthor: frankrede » Wed Dec 19, 2007 3:05 am

Does no one think around here?
For the piston valve a ball valve will work!
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Unread postAuthor: Ragnarok » Wed Dec 19, 2007 9:33 am

AlbinoSpud wrote:On mcmaster, it's like 50$ for one and that kind of my budget for the whole cannon :?

Wait... You want a 400 psi cannon for $50? That's optimistic.
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