Design Verification and Analysis for Metal Floating Ball Valves
| Autor: | Chao-Yun Chang, 張超昀 |
|---|---|
| Rok vydání: | 2015 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 103 A ball valve is an important part for controlling flow directions and capacities of fluids in piping equipment in food processing, petroleum and chemical plants as well as a type of pressure vessels. Therefore, EU (EN), UK (BS) and US (ASME、API) etc. have drawn up a considerable number of design standards and testing specifications to ensure that each product is standardized. There is even certification for compliance to EU’s Pressure Equipment Directive (PED) to ensure safe operation and use. Since ball valves that are made in Taiwan have been greatly improved in production technology and quality compared to the past and technology development and trends have increasingly required better ball valve functionality, it is of value to explore in depth and study the design verification and manufacturing processes for ball valves. This study used US standard cast stainless steel (ASTM A351 CF8M=316) as the material for investment casting of ball valves. Firstly, the 3D computer-aided design software SolidWorks was used as the tool for designing the overall ball valve structure. In the design process, the finite element analysis simulation module of Solidworks, was used in combination to explore main structural components in a ball valve that are directly linked to pressure, such as valve bodies (pressure withstanding), valve covers (pressure withstanding) and valve stems (torque withstanding) etc. and analyze and verify their functionalities. Results of the analysis showed that the key factor was change in wall thickness for pressure withstanding components and size of cross-sectional area for torque withstanding ones. Therefore, the testing in this study first focused on analyzing the chemical composition and mechanical properties of materials used in the investment castings and the impact they could withstand. The data obtained from the testing and analysis were all within the range of standard values described in materials specifications. Then, traditional design calculation methods were used as the foundation in combination with computer-aided design and simulation analysis software for calculations with predefined parameters to obtain results of simulation analysis. This approach allows timely corrections and adjustments to designs if flaws are found and determined, thereby shortening the time for design development and enabling effective verification of final structural designs, which ensures that ball values comply with related testing specifications and meet customer requirements for products. It is hope that the design development and analysis for ball valves described in this paper can offer substantial contributions, suggestions and insights for the industry and academia alike. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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