BS EN 60534-2-5-2003 工业过程控制阀.流通能力.通过有段间恢复功能的多段控制阀的流体流量的校准公式

标准号：BS EN 60534-2-5-2003
中文标准名称：工业过程控制阀.流通能力.通过有段间恢复功能的多段控制阀的流体流量的校准公式
英文标准名称：Industrial-process control valves - Flow capacity - Sizing equations for fluid flow through multistage control valves with interstage recovery
标准类型：N16
发布日期：2003/11/7 12:00:00
实施日期：2003/11/7 12:00:00
中国标准分类号：N16
国际标准分类号：23.060.40;25.040.40
适用范围：This part of IEC 60534 includes equations for predicting the flow of compressible and incompressible fluids through multistage control valves. The equations for incompressible flow are based on standard hydrodynamic equations for Newtonian incompressible fluids. They are not intended for use when non-Newtonian fluids, fluid mixtures, slurries, or liquid-solid conveyance systems are encountered. At very low ratios of pressure differential to absolute inlet pressure (△p/p1), compressible fluids behave similarly to incompressible fluids. Under such conditions, the sizing equations for compressible flow can be traced to the standard hydrodynamic equations for Newtonian incompressible fluids. However, increasing values of △p/p1 result in compressibility effects which require that the basic equations be modified by appropriate correction factors. The equations for compressible fluids 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. This standard is applicable only to those designs of multistage multipath control valves and multistage single path control valves.