Abstract
The active components such as valve, pump and snubber to used in nuclear power plants shall be qualified according to ASME QME-1. For the qualification of valve assembly among various active components, the valve operation must be verified with considering the flow conditions. But the limitation of the test facility leads to the engineering evaluation on the valve operation. In general, the evaluation is related to the force such as the bearing torque, seating torque, packing torque, hydrostatic torque and hydrodynamic torque. Especially, the hydrodynamic torque coefficient is important, because the hydrodynamic torque is generally acquired from the test. This situation makes the valve maker difficult in design and qualification. And the evaluation of flow coefficient is also in same difficult situation to the valve maker. In this study, the hydrodynamic torque coefficient and flow coefficient are measured from the flow test and analyzed with CFD. And the CFD results have the engineering meanings within small error in comparison to the real test result. It is confirmed that the CFD is useful tools to get the performance parameter of valve, such as the hydrodynamic torque coefficient and flow coefficient.
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