共查询到20条相似文献,搜索用时 156 毫秒
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七 关于直行程控制阀的外漏
随着对环保的要求越来越高,如何提高直行程控制阀阀杆密封、防止阀杆外漏的问题已经普遍被各个阀门制造商所关注。对于这类控制阀的阀杆密封,通常采用波纹管密封和普通填料密封两种技术,波纹管从材质上主要有金属波纹管和PTFE波纹管。 相似文献
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我厂铅烟气制酸工程中使用了30多只Dg300的衬胶球形隔膜阀,在开车过程中发现该种阀门关不死,关闭时产生内漏和外漏,严重影响系统的正常开车。经我们查找原因,发现主要是由于原阀门的隔膜片的密封线结构计设不合理,内外密封线上的密封比压不同,使隔膜片的内外密封线变形不同,使之产生内漏和外漏。原阀隔膜片密封线结构如图1所示,外封线是在阀门装配时由螺栓加预紧力,使密封线 相似文献
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本文通过对阀门用石棉填料工作性能的研究,证明了设计的填料应力松弛试验机基本上是可行的。同时也提出了应力松弛、压缩回弹、摩擦系数、工作寿命等性能是评价石棉填料优劣的重要指标,对解决阀门外漏有着重要意义。 相似文献
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分析了ISO15848-1与API622两个标准在针对对象、检测条件、检测方法和接受准则等不同点,同时介绍了影响阀门填料逸散性的因素。 相似文献
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Investigation of the relationship between internal fluid leakage through a valve and the acoustic emission generated from the leakage 总被引:3,自引:0,他引:3
The detection of acoustic emission (AE) signals produced by liquid and gas leakage through valves can be related directly to the qualitative leakage rate. This allows for cost estimation of losses in processes for several industries. However, to find out the relationship between qualitative leakage rate and AE signal large amounts of experimental data is needed. This paper presents a theoretical investigation of the acoustic emission to detect the internal leakage rate through a valve and experimental validation. The AE signals generated by internal liquid and gas leakage through valves were characterised. The effect of the influenced factors of leakage rates, inlet pressure levels, valve sizes and valve types, on AE parameter, AERMS, were studied and explained. The results of theoretical and experimental showed that AE signal power computed from the power spectral density (PSD) correlated well with influenced factors of leakage rates. Finally, a novel and inexpensive AE instrument has been invented for predicting qualitative leakage rate using a micro processor and derived relationship. 相似文献
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基于免疫机理的往复压缩机气阀故障检测方法 总被引:9,自引:0,他引:9
气阀故障是往复压缩机最常见的故障类型之一,由于往复压缩机的工作机理复杂,故障样本缺乏,难以应用常规方法对其进行有效的故障检测。为了能够准确检测气阀的各种故障,基于生物免疫系统的反面选择机理及反面选择算法,首先对设备故障检测问题进行了描述,引进了设备状态空间、自己—非己空间及模糊空间的概念,继而提出了适于往复压缩机气阀故障检测的新方法。通过对气阀常见故障的检测结果表明,所提出的方法能够以异常度曲线的形式较好地反映出气阀的各种故障,表明了该方法的有效性。基于免疫机理的设备故障检测方法,是在对设备正常运行数据学习的基础上,实现对设备的故障检测,不需要设备运行的故障数据,它适合对故障数据缺乏的设备进行有效的故障检测。 相似文献