Importance Of Maintenance Of Valves Such As Ball Valves, Gate Valves, Check Valves, Globe Valves, Filters, Etc. In China.
For a long time, most industries in China have replaced old valves with new ones, and discarded or sold the replaced valves such as Ball Valve, gate valves, check valves, stop valves, filters, etc. as waste. Especially in industries that use flanged valves. As for the replaced high-pressure, high-temperature, and large valves, they want to repair them, but they don't know how to repair them. Most of them are still in the manual repair stage. It can be said that in China's valve maintenance industry, the waste and the benefits that can be obtained are huge. A power station (4x5omw~4x2oomw) has to repair tens of thousands of steam turbine valves and bypass valves every year. The power plant has only one grinding machine imported from Germany in 1992, and the rest are manually operated, which is not only inefficient, but also does not meet the requirements of precision. The bypass high-pressure pressure reducing valve leaked, but the power plant could not repair it. The repair effect was not ideal when it was sent to Shanghai. In recent years, as various units gradually began to conduct independent economic accounting and reduce costs, managers and front-line maintenance workers have gradually realized the importance of repairing valves, because the funds that can be saved in this regard are extremely considerable. However, valve repair here does not mean simple repair, but also includes the use of correct repair methods and excellent grinding and repair equipment.
Due to the lack of concepts and equipment for valve maintenance and overhaul, currently only nuclear power plants in China can basically overhaul all valves during each shutdown and overhaul. Repairing after it breaks is a kind of maintenance-free repair, which is extremely unfavorable to the safe operation of the whole set of equipment and the service life of the valve. The potential danger of emergency shutdown accidents is extremely high, and the losses caused by it are also huge. For example: A petrochemical in Tianjin has a set of production equipment imported from Germany. It has never been overhauled since it was put into production in 1981 to 1996. In 1996, it was found that several key packing valves were leaking, and the German manufacturer no longer produced this special valve. If it is re-ordered, it will not only be expensive, but also have a long delivery period, which will bring huge economic losses. Therefore, preventive maintenance and repair measures for industrial high-temperature and high-pressure valves are the most economical and reliable way to solve valve leakage and extend service life.
If a valve is not maintained properly, once it leaks, it is often already seriously damaged, which not only increases the difficulty of repair, but also often even loses the possibility and value of repair. Therefore, for the well-organized and well-managed valve maintenance work such as ball valves, gate valves, check valves, stop valves, filters, etc., not only the relevant personnel should have corresponding awareness, but more importantly, preventive and maintenance measures, that is, regular inspection of the valve (for example, the sealing of the valve relative to the outside world, the sealing of the valve in the closed state, etc.). The key to preventive maintenance of valves is to repair the valve immediately when a leak is found for the first time, because the circulating medium can cause large-scale damage to the sealing surface in a short time even if the sealing surface is slightly damaged, resulting in expensive maintenance costs.
