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air chamber to sprinkler valve

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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air chamber to sprinkler valve

Unread postAuthor: brettdotcom14 » Fri May 01, 2009 5:40 pm

im going to have a typical over under pneumatic with the sprinkler valve on top. 3" diameter air chamber and a 1" sprinkler valve. should i go from the 3" air chamber to a 2" then to the 1" sprinkler valve or just go from the 3" chamber to 1" all around?
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Unread postAuthor: jmccalip » Fri May 01, 2009 5:47 pm

Well, I'm no expert, but I'd assume you would want the least amount of restriction until you reach the valve. This way the maximum amount of air reaches the valve at one time.
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Unread postAuthor: Gaderelguitarist » Fri May 01, 2009 5:49 pm

In a 1" sprinkler valve, you're getting about 3/4" of flow. Reducing from 3" to 2" can hardly be called a restriction in this case.

Restriction is bad. Flow is good.
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Unread postAuthor: brettdotcom14 » Fri May 01, 2009 5:50 pm

i was thinking 2" too but then i thought once it went through the 1" sprinkler valve it wouldnt matter?
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Unread postAuthor: Gaderelguitarist » Fri May 01, 2009 5:54 pm

Just think of it this way...

It take a lot longer to fit a watermelon through a straw than through a basketball hoop.

Air is matter after all. The particles need space to flow.
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Unread postAuthor: brettdotcom14 » Fri May 01, 2009 6:49 pm

would there be a huge difference using the 1" instead of the 2"?
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Unread postAuthor: jmccalip » Fri May 01, 2009 7:15 pm

brettdotcom14 wrote:would there be a huge difference using the 1" instead of the 2"?


Nobody can tell you exactly. Why don't you just spend the extra $2-3 and make it 2"???
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Unread postAuthor: brettdotcom14 » Fri May 01, 2009 7:29 pm

where can i get a 1" m npt to a 2" slip? find me that and i will do it
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Unread postAuthor: Gaderelguitarist » Fri May 01, 2009 7:38 pm

You'll need a 2" coupling, a 2" to 1" bushing and a 1" male adapter. Additionally a short piece of 1" pipe will be needed.
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Unread postAuthor: jook13 » Fri May 01, 2009 8:08 pm

In the question you are asking in the original post, I dont see it making a difference either way.

Do what ever makes more sense as far as money and availability of parts.
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