Threaded surfaces used to secure control valves are susceptible to corrosion

During the operation of the valve seat control valve, due to the infiltration of the medium, the inner surface of the thread used for fixing the valve seat is easily corroded and the valve seat is loosened. Pay attention when checking. For valves operating under high pressure difference, it is also necessary to check whether the sealing surface of the valve seat is damaged.

The valve core and the valve core are the movable parts during the conditioning operation. They are severely eroded and corroded by the medium. During maintenance, it is necessary to carefully check whether the various parts of the valve core are corroded and worn, especially under the condition of high pressure difference. For severe (due to cavitation), care should be taken. If the valve core is seriously damaged, it should be replaced. In addition, you should pay attention to whether the valve stem also has a similar phenomenon, or the connection with the valve core is loose.

Diaphragm "O" rings and other gaskets. The diaphragm and "O"-shaped gasket in the regulating valve should be checked for aging and cracking. The sealing packing should pay attention to whether the polytetrafluoroethylene packing and the sealing lubricating grease are aging, and whether the cooperation surface is damaged, and should be replaced when necessary.