What is the difference between kv and cv

The valve coefficient Cv in imperial unit is the number of US gallons 3, liters of water at 60 deg F that passes through the valve causing a pressure drop across the valve of 1 PSI. Pressure drop consideration is most important while designing the system. The reason for this is the velocity varies with pressure drop caused by valve structure. Taking all these factors into consideration, we evaluate the valve coefficients and performance of the control valve. The flow factor Kv is the most critical parameter.

It characterizes the flow through a valve. Flow coefficient Cv and Flow Factor Kv are values used to describe the hydraulic capacity of a control valve. Quickly compare different brands of valves and their flow capacities. Help to select a valve that is the right size and not oversized for the application. One can quickly understand how the valve you select will have an effect on the pressure in your system.

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Some of our calculators and applications let you save application data to your local computer. If the valve is going to be most of the time opened, probably there should be selected a valve with low head loss in order to save energy.

Or if it is needed a control valve, the range of coefficients for the different opening positions of the valve should fit the requirements of the application. Depending of manufacturer, type of valve, application the flow coefficient can be expressed in several ways. The coefficient can be non-dimensional or with units if parameters such as diameter or density are considered inside the coefficient or just in the equation.

Most of valve industry have standardized the flow coefficient K. It is referenced for water at a specific temperature, and flow rate and drop pressure units. Same model valve has different coefficient for each diameter.

Kv is the flow coefficient in metric units. Cv is the flow coefficient in imperial units. Equivalence between flow coefficients Kv and Cv. At valves which discharge the flow directly into the environment it is used the non-dimensional Discharge Coefficient C.