原文：
           我国成套生产线设备中使用的钟罩式安全阀，均随成套设备配套而来，用户反映泄漏量大，维修更换不方便，而且价格昂贵。研制成套设备的配套安全阀，既能为用户节约资金，解决后顾之忧，又为我厂制造安全阀新产品找到一条新路子。 1、结构分析 对用户提供原结构不同的3种安全阀，按照GB 12243―89《弹簧直接载荷式安全阀》进行整定压力、密封性和机械特性等项目检验，截止阀结果3种安全阀的整定压力偏差均符合要求，动作灵活，无卡阻，机械特性好，但密封性都较差，每分钟气泡数分别为480、455和265，泄漏量均超出国标规定值10倍以上。为寻找泄漏原因，我们对其结构进行了分析。

      该类安全阀由阀体、阀座、阀瓣、导向套、钟罩、阀杆、弹簧及阀盖等主要零部件组成，钟罩形式分蝶形、钟形和反冲盘形几种，进出口直径有相等的、有出口比进口放大1级的、还有放大2级或2级以上的，蝶阀零件加工精度高、阀腔清洁度好。但阀瓣(图1a)厚度均较薄，最小只有2.5 mm，硬度较低(HRC＜30)，受热起跳易产生变形和磨损，引起泄漏。 2、改进与试制 针对受热变形泄漏问题，经反复比较试验，改进了原安全阀密封结构，将阀瓣与导向块连成一体，将锥面密封改为平面密封，增加了阀瓣厚度，并在阀座和阀瓣的密封面上堆焊钴基硬质合金，以提高密封面的耐温性能和表面硬度，止回阀解决了受热变形泄漏问题，改进后的阀瓣结构见图1b。

     根据成套设备的安装尺寸及性能参数，首批试制了2个品种、3个规格共7台平面密封安全阀，适用介质为联苯加联苯醚，工作温度小于或等于330 ℃，开启压力分别为0.45 MPa、0.55 MPa和1.2 MPa。球阀安装于某生产线上连续试用123天，停产检修时拆下进行开启压力和密封性检验，结果见表1。表中数据说明，试用的这批安全阀，开启压力和密封性能均达到国家标准规定的优质品要求. 3、推广应用 在改进试制成功后，又对该厂成套设备上闸阀的安全阀逐步进行改造。至1992年底，将该厂生产线上的原配套安全阀全部更换为我厂生产的安全阀，安全阀运行2年后，所有安全阀工作性能稳定，开启灵敏，密封性好，未发现异常现象，这不仅为该厂节约了购买配套安全阀的外汇费用(折合人民币180余万元)，也为我厂安全阀产品质量上档次起到了借鉴和促进作用。

“ Bell-type safety valve and promote the use of structural analysis ”是由中国安全阀网提供的国际阀门新闻，译文仅供参考。另外，中国安全阀网还提供相关产品搜索： 封闭式安全阀、 高压安全阀、 锅炉安全阀、 蒸汽安全阀、 主安全阀(主阀)等。

译文：
        My complete set of production line equipment used in bell-type safety valve, all come with matching equipment, users reflect the leakage of large amount of maintenance and replacement are inconvenient and expensive. Supporting development of complete sets of equipment safety valve, both for the user to save money, solve the worries, safety valve Balance valves for my factory manufacture of new products to find a new road. 1, structural analysis Users of the original structure of the 3 different safety valve, according to GB 12243-89 "Spring loaded safety valve" to set pressure, sealing and mechanical characteristics of such items as test results three kinds of safety valve set pressure deviations are in lineMud Valves with requirements , easily and without jamming, good mechanical properties, but the seal is poor, the number of bubbles per minute, respectively, 480,455 and 265, standard leakage Liangjun super abroad more than 10 times the specified value. To search for leakage, we analyze its structure. Such safety valve from the valve body, valve seat, disc, guide sleeve, bell, valve stem, spring and valve cover and other major component parts, the bell form of sub-butterfly, bell-shaped and kick some disc, import and export of equal diameter, with exports than imports increased by 1 level, there are enlarged two or two above, high precision parts, valve chamber cleanliness good. But the disc (Figure 1a) are thin thickness, the minimum is only 2.5 mm, the lower hardness (HRC <30), heat distortion and easy to wear off, causing leakage. 2, improvement and manufacture of Heat leak for the deformation by repeatedSafety valves comparisons test, to improve the original safety valve seal structure of the valve flap and guide block fused, the conical seal Gaiwei flat seal, an increase of disc thickness, and the valve seat and valve valve sealing surface welding of cobalt-based alloy, to improve the sealing surface of the heat resistance and surface hardness, heat distortion solve the leakage problem,Gauge Valves the improved valve flap structure shown in Figure 1b. According to the installation of equipment size and performance parameters, the first trial of the two varieties, 3 of 7 sets standard flat sealing safety valve, for added diphenyl ether medium, working temperature is less than or equal to 330 ℃, open the pressure were 0.45 MPa, 0.55 MPa and 1.2 MPa. Try to install a particular production line continuous 123 days, when removed for maintenance shutdown opening pressure and tightness test, the results in Table 1. Data in the table shows, Globe Valvesthe trial of these safety valve, opening pressure, and sealing performance reached the national standard of quality product requirements. 3, promote the use of In improving the trial is successful, then the plant's safety valve equipment gradually transform. To the end of 1992, the factory production line to replace all the original equipment safety valve safety valve for my factory production, running for 2 years, all the safety valve performance and stability, open sensitive, sealing, and no abnormal phenomenon, not only saving for the plant to buy foreign exchange costs of supporting the safety valve (equivalent to RMB 180 million), safety valve for our factory grade product quality and facilitating role played a draw.

原文来源：http://www.1anquanfa.com/

2010-08-23 07:24

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