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International Standard Serial Number:
ISSN 1001-4551
Sponsor:
Zhejiang University;
Zhejiang Machinery and Electrical Group
Edited by:
Editorial of Journal of Mechanical & Electrical Engineering
Chief Editor:
ZHAO Qun
Vice Chief Editor:
TANG ren-zhong,
LUO Xiang-yang
Tel:
86-571-87041360,87239525
Fax:
86-571-87239571
Add:
No.9 Gaoguannong,Daxue Road,Hangzhou,China
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310009
E-mail:
meem_contribute@163.com
Abstract: Aiming at the problem of poor sealing of all-welded ball valves, a comprehensive study of sealing performance of NPS16 Class600 ball valve was executed by means of theory, simulation and verified by experiments, and the multi-objective optimization design of sealing structure parameters was carried out based on response surface method. Firstly, the design of experiment (DOE) and response surface method (RSM) methods were used to establish the optimizing equation, and the force of sealing construction was analyzed. Then, by building a test platform, the openness of the sealing structure was tested and the results of the simulation analysis were verified according to the test results. The ANSYS software was used to carry out a static analysis of the sealing structure of the floating ball valve, and the influence of the diameter of the ball (d1), the thickness of the seat (D7), the middle diameter (D10) and the chamfer (DA) on the sealing performance was studied. Finally, based on the response surface optimization (RSO) module, the main sealing structural parameters were optimized,and the optimization effect and sealing performance were further verified. The results indicate that the effect of D10 on the minimum gap value (Cmin) was the most significant. The effect of d1 on the maximum equivalent force (S1max) has the highest significance. Under the coupling effect of the two parameters of the sealing structure, the effect of DA and D7 on the minimum clearance value (Cmin) is significant, and the effect of DA and d1 on the maximum equivalent force (S1max) is significant. The maximum deformation (Demax) of the seal structure after the optimized design is reduced by 57.2% and the average contact pressure of the sealing surface is increased by 7.8%, which can achieve a highprecision design of the sealing structure of the floating ball valve.
Key words: hydraulic control valve; response surface method (RSM); design of experiment (DOE); all-welded ball valve; sealing performance; minimum clearance value (Cmin); maximum equivalent force (S1max)
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