For a long time, most of the domestic industries have adopted the form of replacing the old with the new valve, throwing away or selling the replaced valve electric device as a waste product. In particular, the industry gate valve, globe valve, and ball valve with flanged valve. I want to repair the replaced high pressure, high temperature, and large valve, but I don't know how to repair 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.
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. . 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 period of time even if the smallest sealing surface is damaged. The large area is damaged, resulting in expensive repair costs.
