Cv Calculation For Steam Control Valve. The valve plug is attached to a valve stem, which, in turn, is connected to the actuator. Chapter 4 describes digital valve controllers, analog positioners, boosters, and other control valve accessories.
The formula will differ depending on the product the valve regulates, such as liquid, gas, or steam. It applies to the factor of the head drop (δh) or pressure drop (δp) over a valve with the flow rate q. (air or water or steam) 2.
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Pressure drop across control valve the following figure is schematic illustration to show fluid flow at around port and plug of In order to have a good control, the design of the control valve should be such that it represents around 1/3 of the total pressure drop of the line. Q is the rate of flow (expressed in us gallons per minute), Chapter 3 covers valve and actuator types.