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| Depressurization stage number of disc in high pressure drop labyrinth control valve |
| Li Shuxun1,2, Hou Yingzhe1,2, Xu Xiaogang1,2, Hu Jian3, Hao Jiaoshan3 |
| 1.College of Petrochemical Technology, Lanzhou University of Technology, Lanzhou, Gansu 730050, China; 2.Center of Engineering and Research for Pumps and Special Valves in Machinery Industry, Lanzhou, Gansu 730050, China; 3.Chongqing Chuanyi Control Valve Co. Ltd., Chongqing 400700, China |
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Abstract How to confirm depressurization stage number on disc is the key design problem for high pressure drop labyrinth control valve. According to the compressible fluid dynamic theory, the calculation formula of depressurization stage number on disc was deduced and analyzed. Numerical simulation of the internal flow in three path models with different stage number were performed by using commercial software CFX, and the distribution of pressure and velocity were obtained, while the changing curve were analyzed. The results show that increasing the stage number is beneficial to reach smooth depressurization and equally distribute pressure, as well as to reduce velocity and outlet energy. In addition, it′s useless to increase the stage number if the path model has been satisfied with the outlet energy criteria. This study could be used as a reference for design of labyrinth control valve.
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Received: 12 March 2013
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