共查询到19条相似文献,搜索用时 140 毫秒
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分析了高压阀门阀体和阀盖的连接形式及其相关标准的规定。提出了石油化工用阀门阀体和阀盖采用压力自紧密封结构连接形式应注意的问题和避免阀门泄漏的辅助措施。 相似文献
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介绍了煤化工用文丘里黑水调节阀在工况系统中的使用特性和技术要求。分析了适用于工况介质的阀门性能参数、清洁结构和应用特点。给出了阀门阀体、阀杆和文丘里基座等主要零部件的结构形式和设计方法。 相似文献
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研究并探讨了分离式阀门密封结构形式采用胶粘剂将铜合金或不锈钢等材质的阀座与铸铁或铸钢材质的阀体或阀瓣粘接在一起,经机加工后作为阀门密封面的新型密封结构形式。 相似文献
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1概述 曲柄阀门体积小、结构紧凑,现场安装占用空间小,相对投资少,适用于中小型钢铁厂高炉炼铁用热风炉系统,作煤气切断阀、燃烧阀、冷风阀和烟道阀等。该阀门分工、Ⅱ型两种结构,Ⅰ型阀门属自密封阀门,在阀板两侧设有上、下4个滚轮沿阀体两侧面导槽滚动。当阀板上、下运动时与阀体间摩擦力减小,阀门在均压状态下使用。但该阀门结构较复杂,使用、检修和维护不方便,逐渐被Ⅱ型阀门所代替。 相似文献
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介绍了石化阀门微泄漏型式试验方法、试验程序、结果评价和评定范围,论述了阀体端部和阀杆密封部位试验测量工装的结构设计,为采用真空法检测阀门微泄漏的型式试验提供了有效方法。 相似文献
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介绍了小口径两体式锻造钛球阀在设计过程中,通过对阀体及阀盖结构进行优化,使得阀门整体的用料量减少,实现节省成本的目的。 相似文献
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Instruments and Experimental Techniques - It is difficult to obtain the interlayer vacuum degree of the LNG (liquified natural gas) vacuum multi-layer insulation pipe at any position, especially... 相似文献
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Yeon Suk Choi 《Journal of Mechanical Science and Technology》2014,28(2):747-753
An experiment to calibrate temperature sensors at cryogenic temperature has been performed. The main objective of this study was to develop a precise instrument for calibrating the temperature sensors over a temperature range of 4 K to approximately room temperature without liquid helium. The instrument consists of radiation shields, a sensor block, an electric heater, a cryocooler and a vacuum chamber. In a vacuum chamber, the cold head of the cryocooler is thermally anchored to the sensor block to bring the apparatus to a desired temperature. An electric heater is placed at the second stage of the cryocooler to control the temperature of the sensor block. The entire apparatus is covered by radiation shields and wrapped in multi-layer insulation to minimize thermal radiation in a vacuum chamber. The dimensions of components including instrumental wires are optimized to reduce total heat invasion from room temperature into cryogenic temperature. The vacuum chamber is pumped down and cooled to cryogenic temperature by a cryocooler. The resistance of each temperature sensor is measured at steady state as well as cooling down and warming up cycles, and the performance of calibration is discussed with respect to the sensitivity and resolution. 相似文献
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