There are many types of valves used on pipelines and their structures are diverse. They are the most easily damaged pipeline accessories for explosion-proof solenoid valves of brass solenoid valve manufacturers. Each valve type must be overhauled according to its specific structure.
Check whether the valve body and bonnet are in good condition.
The valve body and the bonnet are the outermost closed shell of the valve. It can withstand the pressure of the medium, the additional force during operation, the weight of other parts of the valve, and the tightness of the flange or thread at the connection. The valve body and valve cover require the refrigeration solenoid valve to have a certain strength and rigidity. The damage is mainly local defects caused by the corrosion, erosion and mechanical damage of the medium. When the wall becomes thin due to corrosion or erosion, its strength and rigidity are affected. When these defects cannot be repaired, they must be replaced.
During the overhaul, the valve body and bonnet should be tested for hydraulic strength, and then water, compressed air, kerosene or other media should be used to test their tightness. The defects of the valve body and bonnet should generally be repaired, and the pipe solenoid should be selected according to the material Corresponding welding rod and welding process of the valve. Defective metal should be cleaned up before repair welding, and inspection and trimming should be carried out after repair welding to eliminate stress.
2. Overhaul of packaging workshop.
The maintenance of the filling room includes the replacement of the filling and the inspection and maintenance of the filling part. When selecting the filling, the use conditions and medium conditions must be considered. Generally speaking, oil-intrusive asbestos packing is suitable for air and at a certain temperature. Steam, water and heavy oil products. Graphite asbestos packing can be used under high temperature and high pressure conditions, especially steel-wound asbestos packing has better pressure resistance. High-temperature media can be used for asbestos and leaded packing, and strong corrosive media can be used for asbestos discs Root or PTFE braid.