Abstract

Balanced control valves need lower lift force due to the use of balancing valve cone. The main cone is freely suspended on the stem and that is why this type of control valves inclines to vibrations. It is necessary for this type of valves to pay special attention to the steam flow conditions and to the aerodynamic forces. The flow through the balanced valve was studied using a mathematical model and also experimentally. 

Numerical calculations of the flow through a balanced valve is based on application of Navier-Stokes equations for compressible flovring medium together with k - ε turbuience model. The RAMPANT code was used for calculations. The task was solved alternativelv for the assumption of axially symmetrical flow and the 3D flow. The unstructured mesh with (12 - 18) •10³ triangles was applied for axially symmetrical flow. The mesh of 160 • 10³ tetrahedral elements was used for 3D flow and the Multigrid solver was applied for getting better convergence. 

The results of numerical simulation are compared with some experimental results of the balanced control valve.