充压式阀座双向密封蝶阀

分析了蝶阀的功能特点及市场需求,介绍了一种充压式阀座结构的充压式阀座双向密封蝶阀的工作原理和结构特点。     

浮动阀座双向金属密封蝶阀设计

分析了三偏心蝶阀在反向受压时存在的问题,介绍了一种新型浮动阀座双向金属密封蝶阀。给出了阀门阀座与阀体的改进结构及相关部件性能参数的计算过程。     

除尘装置对三偏心蝶阀区域粉尘沉降抑制效能的仿真分析

高炉煤气含大量粉尘,易在管道内三偏心蝶阀阀座密封面底部板结,影响阀板转动或损坏密封面,影响高炉生产并造成经济损失.为阻止粉尘在蝶阀阀座密封面底部板结,采用Pro/E设计了蝶阀区域的粉尘自动清除装置.基于ANSYS Workbench的FLUENT模块,选择标准k-ε模型和DPM模型,对不同阀板开度(15°,30°,45°,60°,75°和90°)时蝶阀区域粉尘沉降轨迹进行了仿真模拟,分析了除尘装置对粉尘沉降特性的影响规律.结果显示:阀板开度30°,45°,60°,75°和90°时,除尘装置均能使三偏心蝶阀阀座密封面底部粉尘板结质量显著降低;阀板开度90°时板结粉尘清除率可高达80.7%;而阀板开度15°时,除尘装置未体现明显除尘效果.     

浮动座双向硬密封蝶阀的设计

分析三偏心蝶阀在反向受压时存在的问题,论述了一种全新的浮动阀座式双向高压硬密封蝶阀的设计原理及其关键工艺的阐述。     

单偏心蝶阀流量特性数值模拟及结构优化

利用FLUENT软件对DN400单偏心蝶阀原始方案进行全开时的流量分析,针对模拟结果总结出影响蝶阀流量系数的重要因素为蝶板、阀座、阀轴和压板结构。通过优化方案对影响流量系数的重要零部件进行结构优化,提升流体域体积,减小流通阻力,增大流量系数,以满足流量系数大于15 000的设计要求。研究结果为单偏心蝶阀设计提供了重要的参考依据。     

浮动式双向金属密封蝶阀的设计

分析了三偏心蝶阀在反向受压时存在的问题，论述了一种新型浮动式双向硬密封蝶阀的设计原理及阀座加工的工艺要求。     

气动排渣蝶阀的研制

介绍了气动排渣蝶阀的关键件－－阀座的结构设计、阀座橡胶材料配方试验及密封过盈量的确定方法。     

液氢用低温三偏心蝶阀的反向密封性能分析北大核心CSCD

针对液氢用低温三偏心蝶阀较难现实反向密封的问题,对三偏心蝶阀在实现反向密封过程中出现的泄漏问题进行分析,探讨了三偏心蝶阀密封的影响因素,研究了三偏心蝶阀反向密封时蝶板的变形。结果表明:在流体反向流动时,解决蝶阀密封副的密封比压,是解决液氢用低温蝶阀反向密封的关键;三偏心蝶阀密封副的密封比压与其过盈配合设计相关;三偏心蝶阀密封圈的密封面边线是形成接触密封的关键位置,将过渡区的面密封改为线密封,有利于降低三偏心蝶阀在关闭时密封圈对阀座的磨损程度,为确保蝶阀形成有效的反向密封,蝶阀关闭时须在密封面上形成连续的密封比压;通过对蝶板和阀座结构采取加大密封部件的刚度和提高密封副的结合程度等优化设计措施,可实现三偏心蝶阀的反向承压密封的功能。选取Class150 NPS42三偏心蝶阀,使用氦气测试其在液氮(-196℃)环境下的反向密封性能,通过试验验证,低温蝶阀在设计压差内的泄漏量不能超过4 L/min,满足并优于标准允许的泄漏值,研究结果可为液氢用低温三偏心蝶阀的设计提供参考依据。     

浮动阀座双向硬密封蝶阀

介绍了浮动阀座双向硬密封蝶阀的结构特点和工作原理。     

液氢用低温三偏心蝶阀的反向密封性能分析

针对液氢用低温三偏心蝶阀较难现实反向密封的问题,对三偏心蝶阀在实现反向密封过程中出现的泄漏问题进行分析,探讨了三偏心蝶阀密封的影响因素,研究了三偏心蝶阀反向密封时蝶板的变形。结果表明：在流体反向流动时,解决蝶阀密封副的密封比压,是解决液氢用低温蝶阀反向密封的关键;三偏心蝶阀密封副的密封比压与其过盈配合设计相关;三偏心蝶阀密封圈的密封面边线是形成接触密封的关键位置,将过渡区的面密封改为线密封,有利于降低三偏心蝶阀在关闭时密封圈对阀座的磨损程度,为确保蝶阀形成有效的反向密封,蝶阀关闭时须在密封面上形成连续的密封比压;通过对蝶板和阀座结构采取加大密封部件的刚度和提高密封副的结合程度等优化设计措施,可实现三偏心蝶阀的反向承压密封的功能。选取Class150 NPS42三偏心蝶阀,使用氦气测试其在液氮（-196℃）环境下的反向密封性能,通过试验验证,低温蝶阀在设计压差内的泄漏量不能超过4 L/min,满足并优于标准允许的泄漏值,研究结果可为液氢用低温三偏心蝶阀的设计提供参考依据。     

三偏心蝶阀反向承压密封问题的有限元研究

应用ansys软件对通径DN300、工作压力PN3.5MPa的三偏心金属蝶阀反向承压密封面接触问题进行了非线性有限元分析,得到反向承压密封时有无预压紧了的条件下蝶阀的应力应变图,通过有限元计算结果分析得到了三偏心金属蝶阀必须通过对阀轴理论装配位置偏移给蝶板预加合适的压紧力,才能够实现反向承压密封。研究对"双向零泄漏"三偏心蝶阀的结构设计有指导意义。     

双向气动快速开关阀动态特性分析

基于ADAMS对双向气动快速开关阀启闭过程进行动力学仿真,同时使用AMESim模拟气动缓冲装置的最佳安装位置,设计出以自主研发的双向冲击气缸为动力的双向快速开关阀。分析结果表明,在0.7MPa气源压力下,双向气动快速开关阀开启、关闭时间一致,均为0.038s;将气动缓冲装置安装在活塞杆前端距动力转换装置初始点20.5mm处可有效避免因冲击过快导致的阀板撞击阀座而引起的部件破坏;阀轴在开关启闭过程中转速过快,轴向存在位移,设计阀门时需注意这一点。研究结果为易燃易爆介质场合使用的垂直板式蝶阀的设计提供了参考。     

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.     

Investigation of the mechanical behavior of a flexible solid metal seal for a cryogenic butterfly valve

Seat tightness at the fully shut position should be a consideration in the development of a butterfly valve for use in a liquefied natural gas (LNG) vessel. A flexible solid metal seal offers sufficient tightness of the butterfly valve and meets the specifications for cryogenic temperature. In the present study, characteristics for a cryogenic butterfly valve, such as the flow coefficient and the pressure loss coefficient, were estimated by numerical fluid analysis carried out to simulate 3-D flow and to study performance as it was affected by the opening angles of the valve disc. A design criterion to ensure the seat tightness of the butterfly valve at the fully shut position was proposed, in which the contact pressure between the metal seal and the valve disc would be compared with the fluid pressure. Numerical structural analysis showed that the contact pressure can be calculated by simulation of the frictional contact behavior on the surface of the metal seal and the valve disc. As a result, an adequate flexibility of the metal seal and the valve disc was required in order to accomplish a contact pressure that would be high enough to satisfy the seat tightness requirement. Under cryogenic temperature, thermal shrinkage caused the metal seal to adhere closely to the valve disc periphery at both sides and raised the contact pressure to a relatively high value, though there was no contact across a small area at the center position, which is susceptible to leakage. An additional displacement of the metal seal and the valve disc appeared at an operating fluid pressure of 6.9 bar and produced sufficient contact pressure at the no-contact area. This was verified by experimental leakage tests performed at room and cryogenic temperatures.     

一种新型蝶阀调节特性的研究

阐述了在普通蝶阀的基础上,加设适当几何结构配流板的方法,使普通蝶阀具有线性流量特性,并用数值模拟计算出阀门的流量特性.然后搭建实验平台,验证了阀门的流量特性,结果表明该流量控制阀具有良好的线性调节功能和高精度的流量控制.     

某型伺服引气阀蝶阀压力损失分析

蝶阀作为伺服引气阀的主阀,其压力损失特性对于伺服引气阀的工作效率、流量控制精度以及下游涡轮起动机性能至关重要。建立了蝶阀压力损失计算的数学模型;通过计算流体力学数值计算方法获取了蝶阀流场总压分布情况,得到了不同工作环境和开启角度时的蝶板压力损失情况。结果表明,供气压力的升高增大了蝶阀压力损失,但不改变蝶阀和涡轮起动机上的压降分配比例;而蝶阀压力损失不受供气温度的影响。对海平面下不同开启角度的蝶阀压力损失进行了试验测试,验证了数学模型及数值计算结果的正确性。     

防气泵阀座的三维有限元分析及结构优化

应用从美国 Ｐ Ｔ Ｃ 公司引进的 Ｐｒｏ／ Ｅ 软件,在 Ｓ Ｇ Ｉ工作站上对防气泵阀座进行了三维有限元数值计算,确定了泵阀座的应力分布和变形规律。通过分析多种因素对防气泵阀座强度及密封性的影响,对其结构进行了优化改进,不仅降低了高应力区的当量应力值,而且使防气泵阀座与阀的密封更加可靠。     

三偏心蝶阀密封面在位测量的点云数据处理方法

三偏心蝶阀依靠蝶板和阀座密封面的充分面接触实现零泄漏的密封效果,而密封面的加工制造精度对密封性能有着至 关重要的作用。 现有的密封面测量主要依赖离线测量的方式,存在着测量基准不统一、二次装夹造成的测量误差等问题。 本文 提出了密封面精密在位测量技术以及原始点云数据处理方法。 针对被测密封面,提出波谷-聚类算法和考虑约束条件的法矢- 曲面拟合算法,得出密封面的关键参数和加工误差。 该算法较最小二乘法等算法在相对求解精度上提高了 60% 以上。 现场在 位测量的三偏心蝶阀密封面锥角与三坐标仪测量结果的相对误差仅为 0. 43% ,满足测量相对误差±0. 5% 的要求,密封面在位测 量技术的测量精度得到了有效验证,为今后高端阀门的精密测量提供了可靠的技术手段。     

三偏心金属蝶阀的干涉分析

通过对蝶板的运动分析,从三偏心蝶阀密封副发生干涉的根本原因介绍了一种判断干涉问题的方法。通过程序分析了蝶板与阀座密封面之间的干涉状况,进而能够很方便地判定不同结构的三偏心蝶阀的干涉情况。