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김대웅(Dae-Woong Kim),박성근(Sung-Keun Park),강신철(Shin-Cheul Kang),이승호(Sung-Ho Lee) 한국유체기계학회 2008 유체기계 연구개발 발표회 논문집 Vol.2008 No.-
The valve performance has been evaluated from the theoretical equation based on design information such as packing thrust, spring pre -load and friction coefficient (μ). The accuracy of those data can be lower than that of vendor's initial design data. Especially, the friction coefficient can be degraded with time than the original condition and the valve performance calculated using the previous friction coefficient can not be available. Accordingly, this paper is describing a new performance evaluation method of valve based on diagnostic test data which are acquired from a site valve tested in static and dynamic conditions. Especially, this paper provides a new method using friction coefficient (μ) which is derived from the data acquired in the valve's design basis condition.
모터구동 글로브밸브의 Side Flow에 의한 디스크 - 몸체 마찰부하 평가
정래혁(Rae-Hyuck Jeoung),박성근(Sung-Keun Park),이도환(Do-Hwan Lee),송석윤(Seok-Yoon Song),강신철(Shin-Cheul Kang) 한국유체기계학회 2003 유체기계 연구개발 발표회 논문집 Vol.- No.-
EPRI PPM (Performance Prediction Methodology), a method used for the prediction of required thrust of valves, can not be applied to unbalanced-disk globe valves operated in the fluid when the fluid temperature is above 150˚F because the thrust increase caused by the friction between the valve disk and body is not considered in the PPM. In order to apply PPM to the valves, EPRI suggested new friction prediction method to be added in the code. This paper analyzes the applicability of the prediction method comparing the disk-to-body friction load predicted from the method with the measured friction load from the field tests. The maximum values from the prediction method and those obtained from the test were 268lbs and about 1500lbs, respectively. It is included that the prediction method should be improved for the realistic prediction of disk-to-body friction load.