Wuxi Wuxi Xishan valve common valve and high-tech products to implement the strategy of simultaneous development and take the independent innovation brand of the road to development. For the key national projects - 801 key engineering equipment and nuclear power, nuclear chemical industry needs of users, independent research and development of four new valve products: "with a boost to open the function of pneumatic valve" invention patents and "bellows valve "And" anti-sulfur pneumatic valve "" high-reliability bellows globe valve "patents and other new products for the valve industry in China has made a positive contribution to the development. State Intellectual Property Office recently to Wuxi Xishan Valve Co., Ltd., the company on September 8, 2006 for the invention patent (Patent No .: ZL.5). Prior to this, Wuxi Xishan Valve Factory developed, with completely independent intellectual property rights of two new valve products: "Bellows Valve", has been September 12, 2007 received a patent certificate (Patent No .: ZL.8). "Pneumatic Gate Valve with Boosting-Opening Function" has obtained the patent certificate (Patent No .: ZL.3) on November 14, 2007. Technical Field and Background of Invention Patent 1. Technical Field This "Pneumatic Gate Valve" which obtained the national invention patent is a new valve product developed by Wuxi Xishan Valve Factory with completely independent intellectual property rights. The patent of the present invention relates to a valve, in particular to a large-sized pneumatic gate valve with three functions of cushioning, limiting and boosting and opening. The patented "pneumatic gate valve" of the invention not only avoids the disadvantages of the traditional pneumatic gate valve, which is easily "wedged" after the gate is closed, the valve can not be opened, the pipeline is blocked, or even a terrible accident occurs, and the valve has excellent High pressure gas seal performance and stable operation, reliable function, simple structure, low manufacturing cost, easy to use and maintain. The patent application of the present invention is a "large-scale pneumatic valve" product, which is a key national project - the key equipment of the 801 project. The installation of a large-scale nuclear chemical plant system for nuclear power and nuclear material production requires large pneumatic valve to have excellent high pressure Gas seal performance and stable operating performance, the valve should be safe and reliable long-term use. This patented product is also suitable for chemical production of toxic, harmful gases and liquids. 2. BACKGROUND OF THE INVENTION Gate valve is an important member of the valve family, and wedge gate valve is the most important structural form of gate valve, the most widely used. Wedge gate valve due to many structural features. For example: the valve fluid resistance is small, the structure of short length, reliable seal, all-metal seal suitable for high temperature and pressure. Therefore, the wedge gate valve in the industrial piping systems used by the number of all types of valves has been the first place. Wedge gate valve in the long-term use, but also gradually revealed an insurmountable disadvantage that gate is easily closed after the "wedge dead", the valve can not be opened, the pipeline is blocked, and even terrible accidents. Wedge gate valve of this serious shortcomings, causing the world's valve industry attaches great importance. For example: the American Petroleum Institute to develop the valve standard: API600 "steel gate valve" provides: increase the stem and gate connection tensile strength requirements, this also specifically developed a "valve plate and stem pull off test" standard (API591). The starting point for all of this is when the gate is "wedged", "Forced On" is applied beyond the normal opening torque. This measure for manual, gear-driven gate valve can be achieved for the electric gate valve due to the motor has a strong overload capacity is basically not a problem, but for the pneumatic valve due to cylinder diameter, air pressure are constant, the cylinder thrust It is difficult to change, in order to achieve "forced open", people designed a "double cylinder valve" is the way to increase the series with a boost to open the cylinder, so the valve structure is complex, the total height of the valve greatly increased the size of the manufacturing The cost is also high, especially for large pneumatic gate valves with nominal diameters larger than DN300mm, the dual-cylinder design becomes unrealistic and unreasonable (manufacturing process is difficult and serviceability is poor). Thus limiting the application and development of large-scale pneumatic valve. Therefore, the current use of pneumatic gate valve in our country, the vast majority of nominal diameter smaller than DN300 small and medium sized pneumatic valve.
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