Understand How Valves & Fittings Affect Head
By definition, C v is the water flow at 15°C expressed in US gpm that travels through the constricted section for a 1 psi head loss, which is more or less equivalent to the water flow expressed in litres per minute, creating a head loss of 5 mbar or 0.05 m of WC. Therefore, for water, we have :
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