Valve Cv Unit Conversion

I have found the reference in crane 410 for converting between cv (valve coefficient) and k (dimensionless resistance coefficient). [m3/h] for a pressure drop of 1 psi [1 bar] across a flow passage [flow. The cv was designed for use with liquid flows, it expresses the flow in gallons per minute of 60º f water with a pressure drop across the valve of 1 psi.

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Convert volume basis flow rate between several different units.

Valve cv unit conversion. Air flow q(scfm) if cv is known; Cv = (25 gpm) (1 / (1 psi))1/2. Cv = 1.156 kv conversion of units for kv to cv.

Q a proper adjustment of the cv calculation should be made based on the piping adjustment coefficient fp if a valve is located between reducers. Unit conversion designation unit to be converted factor unit to be used length ft 304.8 mm inch 25.4 mm. Depending on the calculation programs or methods available and engineer may require to convert between one form or another.

Consider the following points when sizing the valve. For a specific gas control valve, the flow coefficient cg or kg is determined experimentally by control valve manufacturers, and you can found it in manufacturers technical specifications. 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.

Kv = 0.865 · cv cv = 1,156 · kv (equivalence between flow coefficients kv and cv) Table 2 was prepared for conversion from water, which has a viscosity of 1.12 centistokes at 60°f, to fluids of higher viscosity. This article demonstrates how to convert between these two parameters when performing functions such as selecting a valve with an equivalent pressure drop to a given orifice plate.

›› quick conversion chart of kv to cv. Kv m3/h flow rate parameter q3/h mvolume flow rate 3kg/m specific gravity p1 bar pressure before the valve p2 bar pressure after the valve ∆p bar pressure drop through the valve This article details the equations required to convert between the resistance coefficient and flow coefficient methods (k, cv and kv).

The valve flow coefficient cv or its metric equivalent kv has been adopted universally as a comparative value for measuring the capacity of control valves. If valve manufacturer gives the cv for water flow, fluids with higher viscosity will have higher resistance to flow in proportion to their viscosity, as related to the viscosity of water. At a particular percentage of opening of valve giving cv = 1 will pass 1us gpm ( at 60 °f) and a pressure differential of 1 psi upstream and downstream across the valve.