Control Valve Cv Si Units

Gallons per minute that passes through a valve at a pressure drop of 1 psi.

Control valve cv si units. The mass flow rate of superheated steam through a valve can be calculated from the valve cv thanks to the following formula : ※2 calculation of viscosity correction is necessary when the fluid is liquid and the kinematic viscosity is 20 mpa・s or more and the calculated cv value is 0.01 or less. This is our valve c v calculator.

Specific formulas used to estimate cv for different fluids is indicated below: How do we get value 1.156 (conversion factor) in formula cv = 1.156kv or cv= 1.156×q×sqrt (g/delta p). For a new valve, this leakage rate must be lower than 0.05 %.

The stated units formulas below. [m3/h] for a pressure drop of 1 psi [1 bar] across a flow passage [flow coefficient: 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.

If the flow coefficient is given in si units, it may be converted to u.s. It describes the relationship between the pressure drop across an orifice valve or other assembly and the corresponding flow rate. Engineering units are by default set to us units, but can be easily changed to si units.

The flow of water through a valve at 60 o f in us gallon/minute at a pressure drop of 1 lb/in 2 Flow coefficient is an imperial measurement and is defined as: Kvo is expressed in m³/h.

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. The valve flow coefficient, cv, is the number of u.s. Equations displayed for easy reference.