Research On The Characteristics Of The Electronically Controlled Pilot-operated Globe Valve And Optimization Design

As an important part of the gas fire extinguishing system,the electronically controlled pilot-operated globe valve directly controls whether the fire extinguishing agent is ejected from the discharge pipeline.Therefore,it is of great significance to make a profound research on it to improve the performance of gas fire extinguishing system.However,there are two problems in the current research: In order to ensure the fire extinguishing efficiency,the electronically controlled pilot-operated globe valve should have a large flow capacity when the opening is constant,but when the flow rate is too large,it is easy to cause greater noise,so its flow capacity and noise need to be optimized;During the opening process of the stop valve,the response time is extremely short,the motion characteristics and flow characteristics are more complex,so it is difficult to provide a reference for the design and optimization of the stop valve through quantitative analysis.In order to solve the above problems,this paper uses theoretical analysis and numerical simulation to make a profound research on the constant opening flow characteristics,opening motion characteristics and flow characteristics of the electronically controlled pilot-operated stop valve,and conducts related experiments.The main research contents are as follows:1.The hybrid grid method is used to mesh the constant-opening model of electronically controlled pilot-operated stop valve,and the grid independence is analyzed.Using CFD software,the electronically controlled pilot-operated stop valve is numerically simulated,and the constant-opening flow characteristics of the globe valve are explored from the perspectives of flow velocity,pressure and disc shape.2.Based on the analysis results of the constant-opening flow characteristics,the optimization goal is to improve the flow capacity and reduce the operating noise.The sample points are constructed by the OSF method,and the response surface fitted by the Kriging model is combined with the MOGA algorithm to realize the optimal design of the the electronically controlled pilot-operated stop valve.Finally,the outlet mass flow is increased by 6.41%,while the sound power level of turbulence noise is reduced by 3.60%.3.Based on the principles of hydrodynamics and dynamics theory,the motion mechanism model for the opening process of the electronically controlled pilot-operated stop valve is established,and its opening motion characteristics are obtained through Simulink.The numerical simulation of the opening process of the stop valve is realized by using dynamic grid technology.The characteristics of flow velocity,pressure and flow parameters during the opening process are analyzed,and the influence of inlet pressure on opening motion characteristics and flow characteristics is investigated.4.An experimental platform for the opening motion characteristics of an electronically controlled pilot-operated globe valve is built.Through the error comparison analysis of simulation data and experimental data,the reliability of the mechanism model and related simulation analysis conclusions is verified.The law of its opening motion characteristics changing with the inlet pressure is revealed.The comparison of the shortest release time of the system design specification verifies that the stop valve has fast opening performance under a variety of working conditions.The research results of this paper have reference significance for the mathematical modeling,simulation analysis and experimental research of the same type of pilot stop valve.