Copper valve is copper casting valve, belongs to industrial parts, in China was the first to be the first to develop and manufacture technology in Ningbo, Zhejiang province. The early 1980s, Ningbo, Zhejiang Province took the lead in the development of manufacturing technology, changing the domestic long-term use of cast iron valves history. The sand casting molding process was initially used in the manufacturing process and changed to forging process in the early 90. Development to the beginning of the 21st century China has developed into a world copper valve manufacturing center.
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