Posted: 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.
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.