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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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Unread postAuthor: judgment_arms » Tue Oct 31, 2006 6:26 pm

Valve -> Flow Coefficient
Typically, valve performance is specified by a valve manufacturer in one of two ways: (1) by Cv or (2) by Kv. GGDT allows for either of these methods and a third; efficiency. Which method is used is defined in the configuration dialog box. For those who may not be familiar with these nomenclatures, a few words are in order. A valve that has a Cv of 1.0 will allow one gallon of water to flow through it per minute with a one psi pressure drop. If I remember correctly, a valve that has a KV of one will allow one liter of water flow through it per minute with a one bar pressure drop. In general, these two parameters will be listed in the manufacturer's literature. If it is not, I suggest using efficiency (30-50% would be typical values).

I copied this from the GGDT home page, POS, i Hope it answers your question.
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Unread postAuthor: POS » Tue Oct 31, 2006 6:38 pm

yeah, a bit. Thanks for the efford. I have an Idea now where it comes from.

Thx
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Unread postAuthor: Bipedal » Sat Nov 04, 2006 8:21 pm

"the flow of water through a valve at 60 oF in US gallon/minute at a pressure drop of 1 lb/in2"
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lol internet.
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