Abstract
Valve assembly must be qualified with technical guide of ASME QME-1 before using in nuclear power plant. In general, the qualification is to be performed by experiment, but lately the new version of ASME QME-1 is to require the qualification by the test based methodology. This study shows that the differential force on disk by fluid flow is to generate the contact force and frictional force on seat ring and guide bar. The last frictional force is to be transferred to the stem nut. The related mechanics is to be solved by multi-body dynamics. The fluid force on disk, named as differential pressure force, is to be calculated using interpolation of dimensionless differential pressure force by computational fluid dynamics(CFD). And the interpolation equation is to be made in multi-body dynamics solver and be applied for the force calculation using dimensionless stroke as dependent variable. This study shows that the contact model on disk, seat ring, and guide bar is to generate similar and proper data on thrust, torque, and stem factor. This study may be useful to evaluate the contact force on the gate valve in detail, that has been considered by simple assumption using limited experiment.
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