Simply input the valve data and the flow data flowrate pressure temperature when relevant then the tool will calculate the cv required for getting the required flow at the required pressure drop. Equations displayed for easy reference.

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### Control valve cv calculation in deciding the size of the control valve that port size we need to calculate the cv value of the process calculated cv by calculating cv has educated more than 50 years which is involved in.

**Cv calculation for steam control valve**. It applies to the factor of the head drop δh or pressure drop δp over a valve with the flow rate q. The flow coefficient for a control valve which in full open position passes 25 gallons per minute of water with a one pound per square inch pressure drop can be calculated as. The following article also gives a thorough explanation on calculation the flow coefficient.

Cv calculation for steam control valve. Online calculator to quickly determine valve and orifice cv kvs values for steam. It is usually considered that the control valve will produce unacceptable noise if the velocity of dry saturated steam in the control valve outlet is greater than 0 3 mach.

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. Introduction calculate the required flow coefficient cv of control valves thanks to this excel calculation tool. Simply input the valve data and the flow data flowrate pressure temperature when relevant then the tool will calculate the cv required for getting the required flow at the required pressure drop.

The speed of sound in steam will depend upon the steam temperature and the quality of the steam but can be calculated from equation 6 4 2 if the conditions are known mach 1 speed of sound. Chapter 4 describes digital valve controllers analog positioners boosters and other control valve accessories. Cv valve flow coefficient gpm p1 upstream pressure bar abs y 1 63 fl δp p1 if y 1 5 subcritical flow.

The formula will differ depending on the product the valve regulates such as liquid gas or steam. The flow coefficient for a control valve which in full open position passes 25 gallons per minute of water with a one pound per square inch pressure drop can be calculated as. Valve cv calculator steam use the selection as a guide only.

Introduction calculate the required flow coefficient cv of control valves thanks to this excel calculation tool. If y 1 5 then y is capped at y ymax 1 5 for critical flow. Cv 25 gpm 1 1 psi 1 2.

In deciding the size of the control valve that port size we need to calculate the cv value of the process calculated cv by calculating cv has educated more than 50 years which is involved in. Control valve cv refers to the flow coefficient of the valve. Please use this form to help select the correct valve for your application.

Calculation of cv and flow through a valve case of superheated steam si units. Includes 53 different calculations.

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