TH2363: Festo "standard nominal flow rate" to Cv calc
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FRC 2363 Triple Helix
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N. Laverdure - 29 Nov 2018
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Key
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Highlighted bold numbers are intended for user input
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Bold numbers are assertions made to the calculation
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Normal numbers are calculation results
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Starting from the valve datasheet
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Standard nominal flow rate,
dry air at STP per DIN 1314
Q_nL/min340From the datasheet for FESTO VUVG-LK10-B52-T-M7-1H2L-S
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L/s5.67Unit conversion
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Finding the mass flow rate
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Standard pressurep_nbar1.013From "Operating conditions and standards in pneumatics"
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Standard temperatureT_ndeg C20From "Operating conditions and standards in pneumatics"
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Density at STPrho_ng/L1.204From gas properties
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Mass flow rate, airm*_ng/s6.82Calculated from the above m*_n = Q_n * rho_n
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Performing a flow bench test to find the Cv
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Inlet pressurep1_testbar6From "Operating conditions and standards in pneumatics"
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atm5.92Unit conversion
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Pressure dropdp_testbar1From "Operating conditions and standards in pneumatics"
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atm0.99Unit conversion
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Inlet temperatureT_testdeg C20From "Operating conditions and standards in pneumatics"
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deg K293.15Unit conversion
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Molecular weight of fluidMW_testg/mol28.96From Engineering Toolbox
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Ratio of specific heats
gamma_test
-1.4From Engineering Toolbox
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Critical pressure drop factorXT_test-0.15Assumption
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Determining if the flow is choked during the flow test?
TRUE
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Finding the flow coefficient
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Flow coefficientCv
gpm/psi^0.5
0.53
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