BS EN 60534-2-1:2011

What is BS EN 60534-2-1 – Industrial process control valves flow capacity about?  

BS EN 60534-2-1 is a part of IEC 60534 series that includes equations for predicting the flow of compressible and incompressible fluids through 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. The equations for incompressible flow may be used with caution for non-vaporizing multi-component liquid mixtures. At very low ratios of pressure differential to absolute inlet pressure (Δp/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 Δp/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 ideal gas or vapor and are not intended for use with multiphase streams such as gas-liquid, vapor-liquid or gas-solid mixtures. Reasonable accuracy can only be maintained when the specific heat ratio, γ, is restricted to the range 1,08 < γ < 1,65. For compressible fluid applications, BS EN 60534-2-1 is valid for valves with xT ≤ 0,84 (see Table D.2). For valves with xT > 0,84 (e.g. some multistage valves), greater inaccuracy of flow prediction can be expected. Note that while the equation structure utilized in BS EN 60534-2-1 departs radically from previous versions of the standard, the basic technology is relatively unchanged. The revised equation format was adopted to simplify the presentation of the various equations and improve the readability of BS EN 60534-2-1.  

Who is BS EN 60534-2-1 - Industrial process control valves flow capacity for? 

BS EN 60534-2-1 on Industrial process control valves flow capacity is useful for: 

• Industrial usage 
• Process control and management  
• Mathematical calculations and equations 
• Pipe fittings and outlet connections 
• Screw down and plug valves  

Why should you use BS EN 60534-2-1 - Industrial process control valves flow capacity?  

Control Valves are popular in most industrial applications because of their advantages. Installation is simple: The process control valves' most basic, yet crucial, benefit is that they are simple to install. This allows you to save a lot of time and work. Another significant advantage is that it is automatically operated. 

Reducers or other fittings are attached to control valves in many industrial applications. The influence of these sorts of fittings on the control valve's nominal flow coefficient can be significant. To account for this effect, a correction factor is introduced. Additional variables are provided to account for the fluid property parameters that influence a control valve's flow capacity. For control valves handling incompressible fluids, the equations in BS EN 60534-2-1 identify the relationships between flow rates, flow coefficients, relevant installation parameters, and important service conditions. 

What’s changed since the last update?  

BS EN 60534-2-1:2011 supersedes BS EN 60534-2-1:1999, which is withdrawn. BS EN 60534-2-1:2011 includes some technical changes with respect to BS EN 60534-2-1:1999. These include: 

• The same fundamental flow model, but changes the equation framework to simplify the use of the standard by introducing the notion of Δpsizing. 
• Changes to the non-turbulent flow corrections and means of computing results. 
• Multi-stage sizing as an Annex.