Pre-maintenance of new valves before operation is a progressive construction concept to protect valve seat seals from seat damage during installation, welding and commissioning.The pre-maintenance of the valve before it is put into use can make it better realize the functions of conduction, truncation and diversion. It is not only conducive to early detection of problems, timely troubleshooting, eliminating hidden dangers, but also to extend the operation period of the pipeline, which can better provide a basis for the operation and maintenance of the valve after it is put into operation.

The valve leakage mostly occurs in the early use, the main reason is in the pipeline construction operation is not standard caused by the sealing ring and valve ball scratches, these scratches if not timely repair, long-term pipeline leakage operation will cause serious consequences, and the switch limit is not in place caused by the leakage, damage to the sealing ring is also very serious.

Seat sealing ring is an important component of the valve, which belongs to soft sealing, sealing materials include nylon, fluorine rubber and other chemical compounds, and its sealing form includes O ring or embedded two ways.Sealing ring no matter what kind of material and installation, can not avoid wear and scour and hard damage, resulting in valve leakage.Therefore, protecting the valve seat is the top priority in valve maintenance.

Once the valve cannot be opened and closed, the sealing device is damaged, serious internal leakage occurs, the grease nozzle is blocked or external leakage and other faults occur, it is difficult to eliminate in time under the condition of pipeline pressure, and it is necessary to deal with the pressure after relief, which not only affects the production period, but also causes the waste of human and material resources and pollution of the environment.Therefore, it is very important to maintain the valve before it is put into operation.