低温阀门上海良工阀门厂蔡惠君１．前言现代科学技术的发展，液化石油气、液化天然气、液氧和液氢等得到广泛应用，这些物质的液化分馏、运输和贮存都需要大量使用低温阀门。在乙烯、甲醇和合成氨等大型石化装置上及制冷和低温工程上也需要大量使用低温阀门。随着低温工业... Low temperature valve Shanghai Industrial Valve Factory Cai Huijun 1. Preface The development of modern science and technology, liquefied petroleum gas, liquefied natural gas, liquid oxygen and liquid hydrogen are widely used, these materials liquefaction fractionation, transportation and storage require extensive use of cryogenic valves. In ethylene, methanol and ammonia and other large petrochemical plants and refrigeration and low temperature engineering also need to use a large number of low-temperature valves. With low temperature industry ...