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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
P.C:
310009
E-mail:
meem_contribute@163.com
Abstract: Flat gate valve is used to connect or cut off the fluid medium in the pipeline. Because the dynamic sealing structure of the valve stem is prone to leakage, it will cause serious safety accidents. The sealing performance of valve stem packing is the key factor restricting the long-term reliable operation of the device. Aiming at the problem of accurate calculation of the contact pressure of the sealing surface of the dynamic sealing structure of the valve stem under clearance assembly conditions, taking the Z943Y-300Lb high-pressure flat gate valve as an example, the theoretical derivation, simulation analysis, and experimental test study were conducted on the contact pressure mechanism of the dynamic sealing structure of the valve stem. The axial mechanical model of the dynamic sealing structure of the valve stem was derived with the help of the elasticity theory, and the contact pressure under multiple working conditions was studied. Then, the theoretical analysis was carried out on the dynamic sealing structure of the valve stem using ANSYS software, and the influence of different assembly clearance values inside and outside the valve stem on the mechanical distribution was studied. Finally, a test platform was set up to test the contact pressure at different locations on the sealing surface and the simulation results were verified by combining the test results. The results show that the maximum value of the contact pressure is less than that of the assembly without clearance, with the inner contact pressure being up to 2.8 MPa and the outer contact pressure being up to 2.3 MPa. The difference between the inner and outer contact pressure at an outer clearance value of 0.2 mm is the smallest, at 0.39 MPa. The error between the theoretical value of the contact pressure and the test data is only 2.3%, and the study can accurately obtain the contact pressure at different locations of the sealing surface.
Key words: high-pressure flat gate valve; clearance assembly; stem; dynamic seal structure; seal leakage; contact pressure accurate calculation
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