Valves are produced by the flow of fluid pipelines. The human use of valves has been nearly a history of 4000 years. In ancient China, from the salt wells to absorb brine, used in the bamboo pipe in the wooden plug valves. In the 1800, the ancient Egyptians used similar wooden cocks to control the distribution of water in the construction of large-scale water conservancy, in order to prevent the flooding of the Nile. These are the embryonic form of valves. Industrial valves are used in a large number of applications from Watt's invention of steam engines. Early 20th century appeared cast iron, cast steel, forged, stainless steel, chromium molybdenum steel, brass and other materials of the valve. Used in various industries, various operating conditions. The earliest introduction of foreign valve production technology companies in China, after introducing foreign production technology, make the domestic valve production technology breakthrough, quality improvement, longevity lengthened.