A multistage pressure reducing valve with specially designed pressure reducing components is presented in this paper. As the deformation of the valve trims under fluid-solid-heat coupling has an important influence on the operation reliability of the valve, a numerical simulation is carried out to analyse the flow field characteristic in the valve and radial deformation of the valve trims using the ANSYS software. And a deformation experiment is designed to validate the deformations of the valve trims at high temperature of 693.15 K. The results indicate that the simulation results agree well with the experimental data. Moreover, it is found that the temperature field has the most significant influence on the deformation of the valve trims, the radial deformations of the matching surface vary from 0.439 to 0.442 mm. And the radial deformations caused by other factors vary from 0.005 to 0.015 mm. In addition, as a novel indicator, the clearance after deformation of the matching surface is used to evaluate the operation reliability of the valve. By using the GAP function in ANSYS static module, the clearances of the matching surface are obtained at different openings under the condition of fluid-solid-heat coupling, further indicating that the initial clearance between the valve plug and inner sleeve should be greater than 0.014 mm to ensure the operation reliability of the valve.
To solve the problem of valve noise, a multi-hole sleeve valve with secondary pressure-reducing function is presented in this paper. During the flow design of the valve, the flow resistance coefficient of the valve served as an important parameter. Because of two pressure-reducing components assembled to a multi-hole sleeve valve, the flow resistance coefficient of the valve changed. Thus, correction of the flow resistance coefficient had to be affected. In this paper, the relationship between the flow rate and flow resistance coefficient of the valve was first mapped and established. Then, the flow rate of the sleeve was obtained using SolidWorks simulation software. Locally refined finite element mesh technology was applied to the simulation to improve simulation accuracy. A parallel flow test platform for the regulating valve was established, and the flow rate of the multi-hole sleeve valve was detected at different openings, thus, verifying the reliability of the numerical simulation results. Finally, the simulation flow rate of the valve at different openings was substituted into the mapping relationship formula, in this way, the flow resistance coefficient of the sleeve valve was obtained. By using the modified flow resistance coefficient, the flow rate characteristics of the multi-hole, secondary pressure-reducing sleeve valve were efficiently and accurately established.
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