全焊接球阀封闭焊缝质量的控制措施

针对天然气长输管线用全焊接球阀的焊缝质量安全问题,提出了焊缝质量安全的控制措施,重点阐述了焊缝的焊接应力消除和焊接后免热处理的方法评定,通过焊接试样的焊接应力、HIC、SSC、CTOD等检测和评定,验证了封闭焊缝质量控制措施的可行性和稳定性,全面提高了全焊接球阀焊接性能,为解决全焊接球阀生产过程中免热处理技术难题提供理论支撑。     

长输管线用球阀密封与内漏分析

介绍了长输管线球阀的密封结构及功能要求,分析了阀门内漏原因和密封失效的型式,论述了长输管线球阀与一般工业用球阀的特殊性,提出了阀门施工安装和选用维护的意见。     

全焊接长输管线球阀十年来的发展

概述了我国长输管线全焊接管线球阀的发展与国产化的历程,分析比较了国内外产品的技术水平及装备制造的能力,以及国产化过程中的技术创新。全焊接管线球阀的全系列国产化,对降低管道工程建设投资、提高国家能源安全具有重要的意义。     

长输管线用固定球球阀密封及密封失效探讨

分析了油气长输管线常用固定球球阀的密封结构和原理,针对球阀的实际工况分析了球阀密封失效的原因,总结了球阀密封失效的应对措施。     

长输管线球阀密封机理失效原因分析及对策

从长输管线工程实际出发,介绍了管线球阀活塞效应阀座密封原理,重点对管线球阀密封失效的原因进行了分析,并提出了相应建议。     

国外先进标准在长输管线全焊接球阀中的应用

介绍了用于长输管线全焊接球阀设计、制造及检验的支持标准,如:AP16D、ASME B16.34、ASME BPVC、ASME B51.8、AP11104及EN14141。     

全焊接管线球阀技术现状的分析与研究

介绍了国内外全焊接管线球阀的结构特点及差异,指出了国内全焊接管线球阀设计和制造等方面存在的不足。     

长输管线球阀结构的设计研究

根据作几年来对我国长输管线球阀的研究，介绍一种新设计的管线阀门－紧急切断球阀，并对其中的主要结构进行详细描述。     

长输管道高压力、大口径全焊接球阀国产化与优化提升

为进一步促进国产长输管道高压大口径全焊接球阀的质量提升,对国内重点厂家展开技术调研,从性能参数、结构及设计方法、材料及制造和使用及维护四个方面分析总结国产全焊接球阀技术现状,并在梳理出国产全焊接球阀共性问题的基础上,提出技术优化提升的研究方向,为后续国产高压大口径全焊接球阀的质量提升奠定基础。     

上装式管线球阀设计简介

针对应用于长输管线上的球阀,从阀体结构出发对比了侧装式与上装式球阀的优缺点,结合市场上现有上装式球阀在设计上存在的不足之处,提出了一种满足API 6D标准规范要求的新型上装式球阀设计方案,并对其设计原理、关键零部件等设计细节进行了介绍,阐述了其拆装工艺措施。该球阀优点突出,是一种在长输管线上比较有应用前景的上装式球阀。     

Study on the design of ball valve based on elastic ring valve seat structure and fluid characteristics and fatigue strength

Aimed at the technical problems such as the influence of granular medium on spring pre-tightening force sealing, a new ball valve based on elastic ring valve seat structure is studied. The spring plate type valve seat structure is designed to cooperate with the ball core for sealing, and the blade spring coil is used to cooperate with the ball core for sealing in the spring plate type valve seat structure. Wherein the supporting back ring supports the blade leaf spring on the outer side to enhance and protect the role of the blade spring coil. The design without the spring cavity avoids the problem of sealing failure caused by medium entering into the spring cavity and affecting the compression spring, and avoids the situation that the valve seat can be sealed with the ball core by pre-tightening the compression spring, thus avoiding the problem of sealing failure caused by the valve seat sticking on the valve body. The mechanical and flow characteristics are studied and analyzed by the ball valve characteristic test system. The stem torque, unbalance torque, flow characteristics and flow coefficient variation at different nominal diameters are analyzed. The seal allowable squeeze stress and seal surface pressure are analyzed, and the seal is stable and reliable with the seal pressure meeting the seal design criteria. The fluid dynamics simulation analyzes the velocity, pressure and flow traces of the fluid flowing through the ball valve under three opening degrees: fully closed, half open and fully open, the maximum velocity-pressure and opening degree variation curves of the inlet and outlet, the maximum velocity-pressure and opening degree variation curves of the inlet and outlet under different nominal diameters and the flow resistance coefficient curves. Static strength analysis was done for the ball core and spring plate seat structure to obtain the stress, displacement, strain and safety factor. The fatigue strength of the ball spool and spring-loaded plate seat structure was analyzed, and the total number of lives (cycles) and load factors were obtained, and the results show that the fatigue strength of the ball spool and spring-loaded plate seat structure is safe and the fatigue strength meets the requirements. Ball valve pressure test, low pressure sealing test and high pressure sealing test, valve body strength and ball valve sealing performance all meet the requirements.     

PTA用钛合金硬密封球阀密封结构设计与分析

以典型项目钛合金硬密封球阀为例,介绍了PTA用钛合金硬密封球阀的技术现状、设计标准等。对密封结构进行设计,并计算所需密封力。结合理论计算进行有限元分析,对钛合金硬密封球阀的阀座密封结构和密封比压进行设计与分析研究。     

天然气管线阀门的特点和选用

介绍了城市天然气管网对阀门的性能要求,以及在城市天然气管网建设中,如何选择天然气管线阀门。     

双槽阶梯槽干气密封性能研究

针对干气密封系统在高转速工况下密封性能差、泄漏量大的问题,提出一种双槽阶梯槽端面密封结构.采用CFD对比分析不同压力、转速下单螺旋槽、双槽阶梯槽、阶梯槽3种槽型的密封性能,探讨槽深、螺旋角对密封性能的影响,得出了双槽阶梯槽型优化的结构参数.结果表明:双槽阶梯槽在降低泄漏量和提高综合密封性能上要优于阶梯槽和单螺旋槽;在槽...     

撑拢式硬密封球阀的结构设计

介绍了侧装式双轨道撑拢式硬密封球阀结构，分析了球阀密封结构和启闭结构的特点和工作原理。     

跨超音速风洞喷管段柔壁新型充气密封围带研制

针对现有多座该类风洞充气密封围带存在的问题,提出"凹"字型结构充气密封围带设计方案。设计的充气密封围带在自然状态下能脱离与侧壁的接触,从而保证充气密封围带不与侧壁刮擦,提高密封围带的使用寿命;采用"凹"字型截面结构,可保证充气密封围带有足够的膨胀量,实现柔壁与风洞侧壁的密封。通过气密性试验、膨胀/回缩试验、试验夹具内密封试验、爆破压力试验、充气疲劳试验、模拟风洞工况试验,对设计的充气密封围带的密封性能进行验证,并成功应用于新建的某跨超音速风洞。实践证明该新型充气密封围带结构紧凑、密封可靠,寿命更长。     

双向平动球阀

介绍了一种球瓣对称设置，通过四连杆机构实现球瓣伸缩及旋转运动的球阀密封新结构。该阀密封比压可调，密封可靠，使用寿命长。此结构已获得发明专利(专利号：Z03226495．X)。     

Prediction method of ball valve internal leakage rate based on acoustic emission technology

Valves on natural gas transmission pipelines are prone to internal leakage due to the influence of environment, transportation medium, misoperation and other factors. Therefore, timely and accurate detection of valve internal leakage is of great significance to the safe operation of the pipelines. As a non-destructive testing method, acoustic emission (AE) technology can be used for online detection of internal leakage of valve. In order to improve the accuracy of AE technology for detecting valve internal leakage, a ball valve internal leakage detection method based on acoustic emission technology is proposed. Firstly, the AE signal generated by the internal leakage of the ball valve is detected by AE sensor, and the AE signal is denoised by wavelet packet threshold denoising. Secondly, the characteristic parameters with high correlation with the internal leakage rate of the ball valve are selected by using the correlation coefficient method to form the sample feature set. Finally, the mathematical model between the internal leakage rate of the ball valve and the characteristic parameters is established by using the sparrow search algorithm to optimize the backpropagation neural network, and to predict the internal leakage rate of the ball valve. An experimental platform is built to verify that the proposed method can predict the internal leakage rate of the ball valve more accurately. It provides strong technical support for the safe operation of natural gas transmission pipelines.     

全焊接球阀非标准试验的分析

根据对国内外多个标准的研究和应用经验,论述了油气管线用高压大口径全焊接球阀的非标准试验项目和评定标准,以及焊缝免焊后热处理的安全评估。     

油封在商用汽车变速器总成中的应用设计探讨

漏油是汽车变速器中较常见的故障,改进是一个长期的课题。主要介绍了商用汽车变速器总成中常用的旋转轴唇形油封的组成、功用及密封原理,重点对与油封相配合的轴和孔的配合部位设计要点进行了探讨,从设计源头提升变速器总成的密封性能。