Transcription of Flow Coefficients and Computations
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Flow Coefficients and Computations
The pipe size in the system ordinarily will determine the valve size. However, to assure accurate throttling or positioning, it is advisable to calculate the valve size. Formulas for liquid and gas are as follows:Liquid Flow Formula* Cv = Qa sg / PQa = Cv P/sg P = sg(Qa/Cv) Gas Flow Formula* Cv = Q/1360 sg(T)/ P 2/(P1+P2)Q = 1360 Cv P/sg(T) (P1+P2)/2 P = P1 P1 (sg T)(Q/[963 Cv]) * Fluid Controls Institute Inc Standard FCI 62-1 ** SCFH (standard cubic foot per hour) of gas is measured at 60 F ( ) and psia. CFH (cubic foot per hour) is measured at any temperature and of CFH to SCFH SCFH = ( ) ( R/Tactual) CFHactualNote: The design of the Straightway Valves are not conducive to good throttling In general, any reduction in outlet pressure below half the absolute inlet pressure will give no further increase in flow. The value of the ratio of pressure at which maximum flow is obtained varies somewhat depending on the actual 71 0 09/15 Dia-Flo Diaphragm ValvesFlow Coefficients and ComputationsWhere: Cv = Flow Coefficient (gpm/ P) sg = Specific Gravity Qa = Actual Flow (gpm) P = Actual pressure Drop P1 P2 (psi)Where: Q = Volumetric flow (SCFH)** sg = Specific gravity T = Absolute Flowing Temperature ( F+460) P1 = Inlet pressure (psia) P2 = Outlet pressure (psia) P = pressure drop (P1 P2) Cv = Valve Coefficient from TablesWhere: SCFH = Standard cubic feet per hour Pactual = pressure of
through a wide open 2 inch unlined valve. Inlet pressure at 60 psig, outlet pressure at 40 psig, and temperature at 60° F. Q = (1360) (70) √20/520 √(74.7+54.7)/2 Q = 150,400 SCFH Problem: Find the rate of flow of water through a 2½" soft rubber lined valve, half …
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