標準號：SIS SS IEC 534-2-2-1983
中文標準名稱：工業過程測控．工業過程控制閥．可壓縮流體尺寸方程
英文標準名稱：Industrial-process measurement and control — Industrial-process control valves — Sizing equations for compressible fluid flow
發布日期：1983/6/25 12:00:00
實施日期：1999/12/31 12:00:00
適用范圍：This section of Part 2 covers equations suitable for use in sizing industrial-process control valves when the flowing media are compressible fluids. At very low ratios of pressure differential to absolute inlet pressure (Ap/p,), compressible fluids behave similarly to incompressible fluids. Under such conditions the sizing equations presented in this section can be traced to the basic Bernoulli equation for Newtonian incompressible fluids. However, increasing values of &plpi result in compressibility effects which require that the basic equations be modified by appropriate correction factors. The equations presented are for use with gas or vapour and are not intended for use with multiphase streams such as gas-liquid, vapour-liquid or gas-solid mixtures.