These application notes provide a simplified procedure for sizing control valves at standard service conditions. The data required to size a valve, such as the nominal size, nominal pressures and KVS, is contained in the SAMSON data sheets for self-operated regulators and control valves. Self-operated regulators and control valves can be sized accurately using the DIN IEC 534 procedure. For most applications, however, the following sizing equations formulated in the VDI/VDE Guideline 2173 provide a sufficient degree of accuracy. In order to calculate the valve flow coefficient KV, the operating data specified in the figure to the right is required.
SAMSON (2005) Valve sizing sample problems