Journal of South China University of Technology(Natural Science) >

2024 , Vol. 52 >Issue 6: 99 - 109

DOI: https://doi.org/10.12141/j.issn.1000-565X.230464

Mechanical Engineering

Design Simulation and Experiment of Double Spool Pilot Cage Control Valve

  • YU Ruiming ,
  • WU Yefei ,
  • WU Bing ,
  • SHEN Yuzhong
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  • 1.School of Mechanical Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
    2.Zhejiang Lenor Flow Control Technology Co. , Ltd. , Wenzhou 325200, Zhejiang, China

Received date: 2023-07-04

  Online published: 2023-10-23

Supported by

the National Natural Science Foundation of China(51975379);the Natural Science Foundation of Shanghai(19ZR1435500)

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Abstract

Aiming at the problem that the unbalanced force and sealing force under high-temperature and high-pressure conditions are difficult to reach the required leakage level, a double spool pilot cage type control valve was designed, in which a large spool and a small spool work together in sections and the medium pressure in front of the valve is fully utilized to increase the sealing force of the valve seat. Then, the calculation equation of unbalanced force, the flow equation and the flow characteristics of the valve were analyzed, the fluid flow was simulated, and the pressure loss after the fluid flows through the control valve was analyzed. Moreover, the fluid flow in the inner cavity of the large valve spool was simulated, and the pressure before the valve, the temperature in the inner cavity as well as the sealing force was analyzed. The motion simulation of large and small spools was also carried out, and the driving force of the actuator, the axial resultant force of the valve spindle and the speed of the large spool were all discussed. The results of valve body’s pressure-tight test and valve seat’s leakage test of normal-temperature medium show that there is no visible leakage and deformation in the valve body; and that the measured leakages of three tests are respectively 1, 1 and 2 drops per minute when the set leakage is 10 drops per minute. In addition, the results of valve seat’s leakage test of high-temperature medium show that, when the set leakage is 1.275 mL/min, the measured leakages of three tests for 250 ℃ high-temperature steam are respectively 0.11, 0.11 and 0.13 mL/min, while those for 300 ℃ high-temperature steam are respectively 0.19, 0.19 and 0.22 mL/min, finding that all the measured leakages are less than the set ones. The double valve spool pilot cage structure proposed in this paper enhances the sealing force of the regulating valve, and, the pressure strength of the valve body and the sealing performance of the valve seat both meet the use requirements.

Key words： double valve spool; pilot cage type; control valve; design simulation; pressure-tight test; leakage test

Cite this article

YU Ruiming , WU Yefei , WU Bing , SHEN Yuzhong . Design Simulation and Experiment of Double Spool Pilot Cage Control Valve[J]. Journal of South China University of Technology(Natural Science), 2024 , 52(6) : 99 -109 . DOI: 10.12141/j.issn.1000-565X.230464

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