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Multiobjective optimization of a pressure maintaining ball valve structure based on RSM and NSGA-II
Pengyun Wen1, Suling Wang2, Jinbo Li1
1School of Mechanics Science and Engineering, Northeast Petroleum University, Daqing, 163318, Heilongjiang, China.
Scientific Reports
|July 2, 2025
Summary
Optimizing ball valve design enhances pressure-retaining coring tools. The study identified key parameters and used advanced methods to improve pressure resistance and sealing, significantly boosting performance.
Area of Science:
- Mechanical Engineering
- Materials Science
- Geological Engineering
Background:
- Ball valve structural design is critical for the pressure-holding capability of coring tools.
- Existing designs may not meet the demands of high-pressure environments.
- Optimization is needed to enhance the reliability and safety of pressure-retaining coring equipment.
Purpose of the Study:
- To optimize the pressure-bearing structure of ball valves for improved pressure retention.
- To establish a theoretical model for predicting the pressure resistance of ball valves.
- To enhance the sealing performance and overall structural integrity of ball valves used in coring tools.
Main Methods:
- Numerical simulation to establish maximum von Mises stress and effective seal width as performance indicators.
- Sensitivity analysis to identify key structural dimensions: valve body inner diameter, sealing surface adjustment, and pressure surface adjustment.
- Response Surface Methodology (RSM) with Central Composite Design (CCD) to develop a regression model.
- Non-dominated Sorting Genetic Algorithm II (NSGA-II) for multi-objective optimization.
Main Results:
- Identified optimal parameters: valve body inner diameter (60 mm), sealing surface adjustment (37 mm), and pressure surface adjustment (35 mm).
- Achieved optimized values: maximum von Mises stress of 806.67 MPa and effective seal width of 11.02 mm.
- Optimized design reduced maximum stress by 8.1% and increased seal width by 118.2% compared to the initial design.
- Model validation showed low errors (3.53% for stress, 6.9% for seal width) against numerical simulations.
Conclusions:
- The optimized ball valve design significantly enhances pressure-bearing strength and sealing performance.
- The developed theoretical model and optimization approach provide reliable predictions and guidance for improving coring equipment.
- This research offers a novel method for increasing the pressure-holding capacity of ball valves, crucial for demanding geological applications.
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