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max pressure

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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max pressure

Unread postAuthor: jon_89 » Wed Aug 08, 2007 1:58 am

what is the max pressure on a 1/2 inch pvc ball valve? thanks
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Unread postAuthor: chaos » Wed Aug 08, 2007 2:12 am

sorry they vary, i have one here that is rated to 1600kpa and one that is certified for use on high pressure steam lines.

maybe find a manufacturer website and look.
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Unread postAuthor: frankrede » Wed Aug 08, 2007 2:12 am

I would trust it to 200 psi.
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Unread postAuthor: Killjoy » Wed Aug 08, 2007 2:16 am

it should say on the handle or body.
Generally a pvc ball valve is rated to 150 psi for a sch 40 one, not sure about a sch 80 valve though
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Unread postAuthor: jon_89 » Wed Aug 08, 2007 2:18 am

what about brass ones? i know the pipe says a max pressure of 420 psi but what do you think is a safe pressure? ( 1 inch )
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Unread postAuthor: Killjoy » Wed Aug 08, 2007 2:27 am

Brass ones, i think they're good to 600 psi. I know most have a red coating on the handle which they print the ratings.
And when you say 1" pipe, do you mean pvc or brass ( I'm assuming pvc). If so then i wouldn't exceed 420 psi, probably be best to give a 100 psi safety margin, especially because pvc shrapenls when it bursts.
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Unread postAuthor: jon_89 » Wed Aug 08, 2007 2:33 am

so no more than 250 psi would be ok?
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Unread postAuthor: frankrede » Wed Aug 08, 2007 2:38 am

I have seen 1/2" pvc blow at less than 100 psi, so your warned.
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Unread postAuthor: potatoflinger » Wed Aug 08, 2007 6:54 am

jon_89 wrote:so no more than 250 psi would be ok?

If you are going that high with the pressure, I would recommend using galvanized pipe, If you aren't already.
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Unread postAuthor: DYI » Tue Aug 14, 2007 9:57 am

Galvanised steel or copper would be better. PVC should be fine, but if it does fail (which it can for any number of reasons), you will be in a lot of trouble. How do you plan on getting it to 250 psi anyway?
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Unread postAuthor: spud yeti » Tue Aug 14, 2007 10:26 am

How do you plan on getting it to 250 psi anyway?


I would suggest a shock pump or compressor

I like working with copper, because its easy to work with, pressure safe (to reasonable extent) and looks good. The only problem is its price though
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Unread postAuthor: Hotwired » Tue Aug 14, 2007 10:54 am

I've not actually seen any compressors which are less than industrial in cost that could produce over 150psi.

Aside from an air rifle compressor which as far as I could see was a mechanised manual pump with a cooling system... which does several thousand psi in small volumes.
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