Cv Calculation For Gas Metric. In metric units, the same valve above with a specified opening giving cv = 1 will pass 0.862m3/hr of water (at 15 degree celsius) if 1bar pressure difference (δp) exist between upstream and downstream points on each side of the valve. For measuring the valve capacity of control valves, the coefficient cv or its metric equivalent kv is adopted.
Ft3 / 35.3 = m3/hr. Converting from m3/hr to ft3/hr: A 2 valve has a cv of 120 at 40%.
To convert mass flow to volume, use the following equation:
You can use 40.0 as a default number if you don’t have the exact figure. The use of this flow coefficient (c v) calculator leads to a standard calculation to compare valve capacities. Convert from cubic feet to kilowatt hours (multiply by 31.6586). Head drop (high of fluid) δp: