Liquids have a higher viscosity than gasses, which affects their flow rate.The pressure drop across a pipe carrying a liquid is different from that of a gas due to the difference in compressibility. Liquids are nearly incompressible, while gasses are highly compressible.This is because the physical properties and behavior of liquids and gasses are different. The expressions for Kv and Cv are different for liquids and gasses. The parameters required for flow rate calculation are:

The Cv and Kv values are the flow coefficients in the imperial and metric systems, respectively. An incorrect flow coefficient can result in poor valve performance and lead to leaks, inconsistent flow, cavitation, and inability to open or close completely.

Determining the correct flow coefficient value helps select the right-sized valve for an application, ensuring that all fluids can flow through at the desired pressure. The valve flow coefficient measures the rate at which fluid (liquid or gas) can pass through a valve.

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