Valve Cv Equation Si Units. Cv and kv are singles values in units of flowrate that may be used to characterise the relationship between flowrate and pressure loss for fittings and equipment. Such as the renault number (reynolds number), flow rate (flow), the shock (choking), the involved joints in pipes (fitting) and the other by the values of these.
For any specific valve opening with an equivalent pressure drop and equivalent temperature, by applying multiplication factor we get equal flows in both imperial and metric units. The use of this flow coefficient (c v) calculator leads to a standard calculation to compare valve capacities. Flow for a given cv is typically calculated from the following formula.
Gallons/min d nominal valve size mm d internal diameter of piping mm d o equivalent circular flow passage diameter mm d h hydraulic diameter of a single flow passage mm f d valve style modifier dimensionless f f
A 2 valve has a cv of 120 at 40%. Such as the renault number (reynolds number), flow rate (flow), the shock (choking), the involved joints in pipes (fitting) and the other by the values of these. A valve with a one psi pressure drop. The flow of water through a valve at 60°f in us gallons/minute (gpm) at a pressure drop of 1lb/in².