508 Parker Hannifin Corporation Fluid Control Solutions Europe General Catalogue FCSE/0112/UK V2.2 07/2022 FLOW RATE FOR GASES The gas flow through a valve is given by: Where Q = Flow Rate [dm3/s] C = Conductance [dm3/s.bar] P 1 = Inlet Pressure [bar abs] γ = Specific Weight [Kg/dm3] k T = Temperature Correction Factor Q = C • P 1 • k T • w • γ air / γgas Nominal Flow Qn: Calculations can be made with specific flow factors based on the CETOP RP 50P standard. For practical purposes and ease of valve selection the catalogue shows the nominal flow Qn. The nominal flow Qn is defined as the flow rate (L/min) of air across the valve when the inlet pressure P1 = 6 bar and the pressure drop ΔP = 1 bar. N.B. The values of the flow factors and flow rates mentioned in catalogues are subjet to +/-15% tolerances. Pneumatic application: γair / γgas = 1 a) Choked flow conditions P2 ≤ b.P1 in this case w = 1 --> Q = C . P1 . kT b) Free flow conditions P2 > b.P1 in this case --> Q = C . P1 . kT . w kT =√ 293 273 + Temp. °C w =√1 - P2/P1 - b 1 - b TECHNICAL INFORMATION
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