When servicing the valve, it must be done in a clean environment. First, clean the outer surface of the valve, remember the nameplate and other signs. The second is to perform non-destructive testing on the valve body cover. The third is to check the contact surface between the valve plate and the valve seat. The fourth is to check the degree of wear of the stem nut.
For damaged parts found in inspection, repair shall be carried out according to the corresponding specifications. When reassembling the valve, all gaskets and packings shall be replaced. After all installations, the strength and tightness tests were performed. The test results are compared with the factory performance parameters of the valve. After meeting the requirements, the warehouse is ready for use.
Valve leakage is a common failure of the valve. Boshan pump manufacturers are generally divided into external leakage and internal leakage. There are two kinds of external leakage: the first type is the leakage of the contact part between the valve and the pipeline, and the second type is the crack, rust or leakage caused by the filler. The internal leakage refers to the leakage caused by the valve closing.
The leakage of the contact part between the valve and the pipeline is generally caused by the aging of the gasket or the looseness of the connecting bolt. This kind of fault can open the bypass pipeline in time, and replace or seal the gasket according to the working specification.
For the valve body cracks, rust caused by external leakage, for the repair cost and the purchase cost is relatively close to the valve, it is recommended to replace the valve with new ones, no need to take measures to repair the valve. There may be several reasons for the leakage caused by the filler:
First, the filler is not compatible with the corrosiveness, temperature and pressure of the working medium. In this case, the filler suitable for the working medium should be selected and reinstalled.
Second, the filling method is wrong, and a leak occurs. At this time, carefully read the valve instruction manual and fill it in the correct way.
Third, the valve filler is used for a long time, and the aging causes leakage. In this case, the filler should be replaced in time.
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