Design and Verification of Metal Seats for Double Eccentric Butterfly Valves

• Main Author: 邱俊瑋
• Other Authors: 鍾官榮
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/68878003383098478684

碩士 === 國立彰化師範大學 === 機電工程學系 === 100 === In this study, computer-aided design (CAE) tool and finite element method (FEM) are applied to analyze performance of a double eccentric butterfly valve with metal seat. An experimental system was developed to measure the amount of valve leakage and the strain of the metal seat at various operation conditions with different pressures and temperatures where they can be drawn back to the design to improve the performance of the valve. Experimental results show that the higher pressure lead more leakage, and simultaneously the greater positive strain of the metal seat. The corresponding results to the analysis in FEM is that the strain of valve disc located in the back-end support rod is greater than that of the disc front contacted with the metal ring resulting in the dramatically decrease of the contact force which is the main factor of increasing the valve leakage. In situation of the high temperatures, the experimental results represent that the higher temperatures leads less valve leakage in case of the highest operation pressure, 300 psi. It indicates that the thermal deformation of the metal seat make the greater contact force with the disc to reduce valve leakage.