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Noob question (help me not kill myself)

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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Noob question (help me not kill myself)

Unread postAuthor: GrafixBoy » Mon Sep 24, 2007 10:43 am

if Im using a modded sprinkler valve with an all metal design, how to you attach the metal pipes to the plastic sprinkler valve?
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Unread postAuthor: Fnord » Mon Sep 24, 2007 10:47 am

You didn't get a threaded one?
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Unread postAuthor: GrafixBoy » Mon Sep 24, 2007 11:10 am

i have the 1" lawn genie and it does not have threads
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Unread postAuthor: Fnord » Mon Sep 24, 2007 11:22 am

If the sprinkler is ment to be solvent welded to the pipe, just get a very short section of 1" pvc and a 1" threaded female adaptor and glue them on.
Then just screw the metal pipe into the adaptor and go from there.

Sprinkler valves are only rated for about 125 psi. Why all metal?
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Unread postAuthor: GrafixBoy » Mon Sep 24, 2007 12:17 pm

well i made a pvc cannon but i didnt use the right stuff and it blew apart. but i have tons of steel pipe fitting stuff that i can use without spending any more money. is there something you recommend using instead of the sprinkler valve?
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Unread postAuthor: MaxuS » Mon Sep 24, 2007 12:18 pm

Yeah, a QEV will do the job better.
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Unread postAuthor: GrafixBoy » Mon Sep 24, 2007 12:23 pm

can you point me to somewhere that explains how a qev works?
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Unread postAuthor: Fnord » Mon Sep 24, 2007 12:23 pm

(edit: ok, the wiki also has an entry on QEVs: http://www.spudfiles.com/spud_wiki/index.php?title=QEV )

You have to buy QEVs online, as there are few stores that sell them. They work on the same principles as a piston valve (Look up piston valves on the wiki link at the top).

If you build a pvc cannon right, it won't blow apart. If you use pressure rated fittings, you'll be fine. Look for fittings that say nsf-pw on them somewhere.

If you have tons of steel pipe fittings, you might be able to make a metal piston valve. It's a bit advanced, so you should research for a while before attempting to build one.
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Last edited by Fnord on Mon Sep 24, 2007 12:28 pm, edited 2 times in total.
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Unread postAuthor: GrafixBoy » Mon Sep 24, 2007 12:26 pm

i didnt use pressure rated fittings. thats why it blew apart.
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Unread postAuthor: GrafixBoy » Mon Sep 24, 2007 12:32 pm

where can i buy the proper qev valve?
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Unread postAuthor: Fnord » Mon Sep 24, 2007 12:43 pm

Start by searching ebay for "quick exhaust valve"

Here is a lot of three QEVs for $30. (really good deal)

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Unread postAuthor: GrafixBoy » Mon Sep 24, 2007 12:50 pm

thanks for your help man.
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Unread postAuthor: MaxuS » Mon Sep 24, 2007 1:49 pm

A QEV is basically the only valve which is easily accessable in the Uk. A 3/4" QEV will outperform a modded 1" sprinkler valve, and theres no modding required for it to work. It really depends on where in the world you live, just do a search for Quick Exhaust Valves and you should come up with some results......................You could always build a piston valve, the opening time on pistons is amazing, plus theyre cheap, need a lot of work to get it right though.
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