What is Valve KV?

Kv is a flow coefficient expressed in MKS units.

It is obtained by dividing Cv by 1.16 (Kv=Cv/1.16).

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Valve KV (also known as Cv) is a parameter used to quantify the flow capacity of a control valve. It represents the flow rate of water (in gallons per minute, GPM) that the valve can pass through at a given pressure drop (typically 1 psi). The term “KV” is commonly used in metric units, while “Cv” is the equivalent imperial unit.

The valve KV (or Cv) value is determined experimentally or calculated based on the valve’s geometry and design characteristics. It is expressed as a numerical value, such as 1.0, 2.5, 10, etc. The higher the KV (or Cv) value, the greater the flow capacity of the valve.

Valve KV (or Cv) values are used in fluid flow calculations and valve sizing. They help in selecting the appropriate control valve for a specific application, ensuring that the valve can handle the required flow rate with an acceptable pressure drop. These values also facilitate system design and analysis, allowing engineers to determine the expected performance of a control valve in a given system.

It’s important to note that the KV (or Cv) value is specific to a particular fluid and operating condition. Different fluids, such as air, gas, or liquids with varying viscosities, will have different flow characteristics and corresponding KV (or Cv) values for the same valve. Therefore, it’s necessary to consider the fluid properties and specific application requirements when using KV (or Cv) values for valve selection and sizing.