Infrastructure is the focus of China's economic construction, drainage works, especially the sewage treatment works in size, WTO has entered the western development has been started, the valve market prospects were bright. Although the cause of water nearly 120 years of history, even earlier than 7 years in Japan, but there is still a great gap, a need for the status quo is more than 700 cities in half the water shortage in China, 100 cities in severe water shortages. The average annual water consumption will increase 7 million m3 / d; particular, China made during the Ninth Five-Year One of the key environmental pollution is the sewage treatment, to control the three lakes (Taihu, Chaohu and Dianchi Lake), focusing on three rivers (Huai-Hai, Liao , Hai), and also asked the national population of 50 million more than 640 county-level city in 2003 before building a city all at least a sewage treatment plant, sewage treatment rate during the Ninth Five-Year 25%, 46% in 2010 requested that the 1000 Block Factory. At present only 200 prefecture-level cities have sewage treatment plants in the next few years will be more than 400 cities in nearly built sewage treatment plant. To invest 180 billion in 2003 to control urban sewage, from 2000 to invest 60 billion yuan annually, up to 200 billion per year investment in equipment, the valve is also not a small share of possession, a medium valve sewage treatment plant about 600 investment -800 million. In addition, water supply, electricity, water, chemical industry demand is great. By 2008 years ago, Beijing is to host the Olympic Games billion investment in 1800, most of which used in the basic construction, basic construction, with the number of valves will also be considerable. Above only the domestic market, entering WTO, we can see only a small domestic market, the greater the market in foreign countries, now in globalization is to make full use of the advantages of the valve industry, and actively to the world economy platform. Valves in several topics outlined in our design, production status, application and development of profiles.
1, the current status of the valve
After the reforms, along with the vigorous development of China's economic construction, the valve industry is also showing a thriving life. There are thousands of the size of the valve plant, despite the good and bad, but the product varieties has reached more than 3,000 models, nearly 30,000 specifications. In the sealing performance, strength requirements, regulatory function, action, performance and circulation performance, especially the sealing performance, have made great strides, back ten years, urban water supply authorities saying the industry association, said famous nine ten valve leakage, though some exaggeration, really unsatisfactory. Example: September 1989 -12 January Chengdu water companies detect valve 145 into the plant, with a pass rate of 72.5% in 1996, 917 test pass rate 88.66%, due to limited means of inspection, acceptance can not be according to national standards, such as strict accordance with national standard pass rate is even lower, valve sealing performance is mainly poor, poor reliability valve operating mechanism as well, etc., to improve the situation there was now ductile baht, resin sand casting, stainless steel valve shaft seal seat, special varieties of special valves, anti-corrosion spray coating applications, and seal design technology, many manufacturers have mastered the material issues, and some (few) manufacturers and some products have nearly reached the international advanced level, replaced the imported products, or exported to foreign countries, the overall level is rising, and foreign advanced level further reduced the distance. However, the overall level of China's machinery manufacturing industry is not high, so the valve should be improved quality.
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