Structural Dsign And Analysis Of Large Diameter Forced Sealing Ball Valve

Forced sealing ball valve combined with gate valve,globe valve and eccentric half ball valve structural characteristics,its closing parts are ball,the operation is through the guide groove and track pin on the valve stem,the ball around the center line of the valve body for rotation to achieve frictionless opening and closing valve.Because of its excellent performance,it is widely used in gas pressure regulating skid,measuring station,high pressure hydrogenation,molecular sieve and other fields.According to the national pipeline network of oil and gas pipeline key equipment localization project arrangement,combined with the actual demand of the China-Russia eastern natural gas pipeline project,the national pipeline network released the localization OF NPS24 Class600,NPS24 Class900 forced sealing ball valve research and development task book in 2019.It is clearly proposed that domestic manufacturers with independent research and development ability of valve research and development,in order to achieve the purpose of domestication of large diameter,high pressure forced sealing ball valve,and further comprehensive replacement of imports.The sealing performance and failure performance of forced sealing ball valve is the most important indicator to measure product quality and the main factor to determine product life.The valve stem as a key part of operation and sealing,its transmission performance will directly affect the use of the whole valve,this topic studied the force of the valve stem and the stress of the guide rail groove,limit pin and ball pin,to ensure that the whole machine open and close smoothly,safe and reliable.This topic relies on the national pipe network in 2019 forced sealing ball valve localization project,the localization of NPS24-Class900 finite element optimization analysis.Starting with the working principle of forced sealing ball valve and the stress analysis of key components,taking the NPS24-Class900 forced sealing ball valve as the research object,the numerical simulation of the stress of each key component,especially the transmission system,in the process of forced sealing ball valve opening and closing was carried out from the perspective of theoretical analysis,calculation and finite element stress analysis.According to the results of theoretical analysis and combined with the operation of the valve opening and closing,the screw guide groove is optimized to ensure the reliability of the large diameter and high pressure forced ball valve.The research of this topic has an important guiding role in the structural design and structural optimization of forced sealing ball valve,which can avoid the occurrence of pipeline failures and accidents caused by improper design of the valve,and avoid valve design and operating costs.The numerical analysis results of key components support the feasibility and universality of this research method.