原文：
In recent years, China's valve industry, the development of faster, but still low overall level of the industry, products with low technological content, and many key parameters of high valve also imported. Some experts estimate that the level of our valves, compared with foreign advanced countries to be down by 10 to 20 years. Not long ago, China's valve industry, to strengthen the valve manufacturing industry and the European exchanges, has organized more than 10 domestic valve industry in China although valve fast development in recent years, but still low overall level of the industry, technological content of products low, many of the key parameters of the valve has high dependence on imports. Some experts estimate that the level of our valves, compared with foreign advanced countries to be down by 10 to 20 years. Not long ago, China's valve industry, to strengthen the valve manufacturing industry and the European exchanges, has organized more than 10 domestic enterprises had had valve trip to Europe, learned a lot of valuable experience of foreign counterparts, while the valve industry compared with foreign , also see our own shortcomings. Process gaps In the welding process, the German company to meet the core-level KSB valve sealing material against radiation, and has been widely used in special welding of cobalt-free solder powder; France Wieland will preheat valve, automatic welding, after welding treatment in the same equipment or process with a complete production line, whether before welding, welding, after welding, handling, temperature control can be achieved to ensure the welding quality. The welding on domestic technology behind the valve, and some also use old-fashioned welding, welder low level of technology, the solder material is also common materials, special valve design reach. Many enterprises engaged in production and sales all day, very few improvements in the technique on studying. In forging the use of new technology, the German company KSB valve material to high temperature alloy steel F91, F22-based, while the high-pressure valve Youyi forgings mainly to ensure the reliability and economy. Of the large volume following valve 600Lb using forging and welding, the valve is not caused by casting porosity, loose, and many other defects, and greatly reduce the waste of free forging materials, economy greatly improved. The domestic industry mostly valve rough pieces of multi-casting, forging the little used in the following high pressure valves 600Lb forging more easy to find. This regard, many enterprises in order to reduce costs, mostly by steel casting, low pressure cast iron pieces and more low-cost materials and processing technology is simple.
原文来自： http://www.nytimes.com/1981/12/26/opinion/escape-valve.html

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