A valve assembly used in nuclear power plants must be qualified and supervised. New technical standards such as ASME QME-1 2007 particularly require detailed qualification using experiment and analysis. Particularly, diagnostic tests and engineering studies are required for qualification of ASME QME-1 2007. Among these studies, the research on the measurement of friction coefficient and packing stress is important. The irregular change of packing stress along the stroke distance occurs because of the abnormal phenomenon, which must be found and studied with quantitative methods. Packing stress should be analyzed conservatively through experimentation and analysis. In this study, various formulas were applied to measure and calculate coefficient of friction and packing stress. This study can be used in relation to qualification and supervision of packing materials. And the calculation using static diagnosis test can be used to find the packing frictional force in dynamic diagnosis test with flow pressure in a pipe. This study has made it possible to reliably consider packing frictional force generated in a valve body. And so, it is believed that more margin can be secured when evaluating the capacity of valve actuator by applying the accurate frictional force generated in the valve assembly.

核电站中使用的阀门组件必须经过认证和监督。ASME QME-1 2007 等新技术标准特别需要使用实验和分析进行详细的鉴定。特别是，ASME QME-1 2007 认证需要诊断测试和工程研究。在这些研究中，对摩擦系数和填充应力测量的研究很重要。填充应力沿行程距离的不规则变化是由于异常现象而发生的，必须用定量的方法发现和研究。应通过试验和分析保守地分析填充应力。在这项研究中，应用各种公式来测量和计算摩擦系数和填充应力。本研究可用于包装材料的鉴定和监督。利用静态诊断试验的计算可以求出管道内流动压力的动态诊断试验中的填料摩擦力。这项研究使可靠地考虑阀体中产生的填料摩擦力成为可能。因此，相信通过施加在阀门组件中产生的精确摩擦力来评估阀门致动器的能力时可以确保更多的裕度。