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flow coefficient?

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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flow coefficient?

Unread postAuthor: judgment_arms » Sat Oct 28, 2006 7:59 pm

Say, what I is the flow coefficient of a 3” coaxial piston valve?
I need to know for GGDT. Thanks all for answering all my questions.
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Unread postAuthor: SpudStuff » Sat Oct 28, 2006 8:02 pm

Do you have a cronie? Otherwise i'd say 30 - 40%.
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Unread postAuthor: judgment_arms » Sat Oct 28, 2006 8:05 pm

No but I wish I did. Do ya know where I can get a cheep cronie? thanks
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Unread postAuthor: SpudStuff » Sat Oct 28, 2006 8:08 pm

They usually run about $70-120
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Unread postAuthor: judgment_arms » Sat Oct 28, 2006 8:14 pm

ya well I’m to cheep to pay that much. Guess I’d better start look at the flea market.
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Unread postAuthor: schmanman » Sat Oct 28, 2006 8:21 pm

but where do you get them (a site would be nice). I will go check ebay now.
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Unread postAuthor: frankrede » Sat Oct 28, 2006 8:24 pm

Paintball stores sell chronies.
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Unread postAuthor: SpudStuff » Sat Oct 28, 2006 8:24 pm

www.Froogle.com, THE best place to look for a product.
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Unread postAuthor: schmanman » Sat Oct 28, 2006 8:37 pm

ok, thanks. how much do they go for at paintball stores?
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Unread postAuthor: boilingleadbath » Sat Oct 28, 2006 8:40 pm

Generaly, I use about 50% for coaxial piston valves.

I don't know how accurate that is, and it's not exactly backed up by crono data... but 30% is way too low, and the HVPL-01 is giving me numbers in that vicinity. (samewhere between 55 and 80some%)
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Unread postAuthor: POS » Tue Oct 31, 2006 8:19 am

what does that flow coefficient mean ? Dont understand ...
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Unread postAuthor: SquishY » Tue Oct 31, 2006 2:17 pm

I was wondering this last night, when I put in a higher number it says that it's optimistic but is 100 an achievable if this is how much flow is there with out using a burst disk.
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Unread postAuthor: boilingleadbath » Tue Oct 31, 2006 2:59 pm

Squishy, I'm pretty sure that even a strait section of pipe has a flow coef. lower than 100%.
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Unread postAuthor: joannaardway » Tue Oct 31, 2006 3:59 pm

As I said in the other topic, it's about 65% for straight pipe.

What 100% represents, I don't know.
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Unread postAuthor: POS » Tue Oct 31, 2006 4:25 pm

O, but WTH does it mean ?
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