Teach You the Correct Maintenance of Valves and Butterfly Valves
Vacuum valve is a control component in the fluid conveying system. It has the functions of cut-off, regulation, diversion, prevention of reverse flow, stabilization, diversion or overflow and pressure relief. Valves used in fluid control systems, ranging from the simplest shut-off valves to the various valves used in extremely complex automatic control systems, have a wide range of varieties and specifications. Valves can be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, mud, oil, liquid metal and radioactive media.
Most of the domestic industries adopt the form of replacing the old with new ones, throwing away or selling the replaced valves as waste products. Especially the industries that use flanged valves. But for the replaced high-pressure, high-temperature, and large valves, they want to repair , But I don’t know how to fix it. Most of them are still in the manual repair stage. It can be said that in the valve maintenance industry in China, the waste and obtainable benefits are huge. A power station needs to repair tens of thousands of turbine valves and bypass valves every year. The power plant only had one grinding machine imported from Germany in 1992, and the rest were operated manually, which was not only inefficient, but also less accurate than required. However, the bypass high-pressure relief valve leaked, but the power plant could not be repaired. Sending to Zhejiang for repair was not satisfactory. In recent years, as each unit has gradually begun independent economic accounting and cost reduction, management personnel to front-line maintenance workers have gradually realized the importance of repairing valves, because the savings in this area are extremely considerable. However, the repair of the valve here does not mean simple repair, but also includes the use of correct repair methods and excellent grinding repair equipment.
Due to the lack of concepts and equipment for valve maintenance and repair, currently only nuclear power plants in China can basically perform maintenance on all valves during each shutdown and maintenance period. Repair after broken is a kind of maintenance-free repair, which is extremely detrimental to the safe operation of the whole set of equipment and the service life of the valve. The potential emergency shutdown accident is extremely dangerous, and the resulting loss is also huge. . For example: A petrochemical company in Tianjin has a complete set of production equipment imported from Germany. It has never been overhauled since it was put into operation in 1981 to 1996. In 1996, it was discovered that several key packing valves were leaking. The German manufacturer no longer produces this Special valves are available, if you re-order, not only the price is high, but the delivery period is very long, 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 prolong service life.
If the valve leaks under the condition of maintenance-free maintenance, it is often already damaged very seriously, which not only increases the difficulty of repair, but also often loses the possibility and value of repair. Therefore, for a well-organized and well-managed valve maintenance work, not only the relevant personnel must have corresponding awareness, but also preventive and maintenance measures, that is, regular inspections of the valve (for example, the sealing of the valve relative to the outside world, The tightness of the valve in the closed state, etc.). The key to preventive maintenance of the valve is to repair the valve immediately when the valve is found to be leaking for the first time, because the circulating medium can cause the sealing surface in a short time even if the smallest sealing surface is damaged. The large area is damaged, resulting in expensive repair costs.