Local resistance coefficients of valves and elbows
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In which standard can the local resistance coefficient of valve Z941H-40 DN20 be found? In which standard can the local resistance coefficient for a 90-degree elbow GB/T 12459 DN200 be found?
Calculate it yourself: the local resistance coefficient of valve Z941H-40 DN20: Process Piping Installation Design Manual for Petrochemical Plants, Part 1: Design and Calculation, P23； Or Appendix E.2 of DL/T 5054-1996: the local resistance coefficient for a 90-degree elbow GB/T 12459 DN200 is ； Appendix E.2 of DL/T 5054-1996: Manual for the Installation Design of Process Piping in Petrochemical Plants – specifies different values for the local resistance coefficient of gate valves based on the opening angle, whereas DL/T 5054-1996 provides different values depending on pressure, temperature, and pipe diameter; there is a significant difference between these two standards