In recent years, with the continuous development of gate valve market economy, the domestic gate valve market also fluctuates. The economic market has not been particularly stable, so has the domestic and foreign market, and the relative export of flange gate valve industry has weakened. But in the next 5-10 years, with the enhancement of China's overall strength and the upcoming G20 Summit (International Economic Cooperation Forum), the overall economic level will show an upward trend. At the same time, the mechanical gate valve industry will slowly pick up. In the next few years, authoritative analysis of gate valve industry development will be biased towards flange gate valve. Flange gate valve is a valve that uses a ball with a circular channel as the opening and closing part, and the ball rotates with the valve rod to realize the opening and closing action. The gate valve's opening and closing part is a sphere with holes, which rotates around the axis perpendicular to the channel, so as to achieve the purpose of opening and closing the channel. The gate valve is mainly used for opening and closing the pipeline and equipment medium. The types of flange gate valves are relatively diverse. Gate valves can be divided into floating gate valve, fixed gate valve, elastic gate valve and oil seal gate valve according to their structural forms; they can be divided into direct energy type, angle type and three-way type according to their channels, and the three-way type can be divided into T-type and L-type. According to the connection work, it can be divided into three types: threaded connection, flange connection and welding. According to the driving mode, there can be stainless steel pneumatic gate valve, stainless steel electric gate valve and manual gate valve, etc.