Valve Cv Si Units

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.

Valve cv si units. [m3/h] for a pressure drop of 1 psi [1 bar] across a flow passage [flow coefficient: Flow coefficient information scope ——the values given below are applicable to floating ball valve/tru nnion mounted ball valve, when the ball valve is in full open condition. Cheval vapeur centivolt ›› si unit:

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. The formula used to select the valve cv with the specified differential pressure is: A valve cv can be described as the number of gallons per minute (gpm) at 60 o f (15.5 o c) that will pass through a valve with an associated pressure drop of 1 psi.

In metric units, the same valve with cv = 1 pass 0.864 m3/hr. Flow coefficient c v ——it is the full capacity flow rate through the valve in us gallons/min. For example a valve with a cv of 10 will flow 10 gpm with a 1 psi pressure drop.

Cv and kv are singles values in units of flowrate that may be used to characterise the relationship between flowrate and pressure loss for fittings and equipment. There are now standardized calculations that are becoming accepted worldwide. Flow coefficient is an imperial measurement and is defined as:

Gallons per minute of water that will pass through a given orifice area at a pressure drop of 1 psi. In europe the valve flow coefficient is called kv. Each has space for four simultaneous calculations.

Valves are tested by running water through it before publishing the cv value. It is defined as the flow rate in us gallons per minute [gpm] of water at a temperature of 60º fahrenheit with a pressure drop across the valve of 1 psi. This technical bulletin shows how flow can be estimated well enough to select a valve size—easily, and without