Maintenance Tips For Forged Steel Check Valve

With the development of social economy, the use of Forged Steel Check Valve is becoming more and more widespread. The valves used in pipelines are of various types and structures. They are also easily damaged pipeline accessories. The inspection and maintenance of each valve should be carried out according to the specific structure. The valves used in pipelines are of various types and structures. They are also easily damaged pipeline accessories. The inspection and maintenance of each valve should be carried out according to the specific structure.

1. Inspection of valve body and valve cover The valve body and valve cover are the outermost closed shell of the valve, which are used to withstand the pressure of the medium, the additional force during operation, the weight of other parts of the valve, and the tightening force of the flange or thread at the connection. The valve body and valve cover are required to have a certain strength and rigidity. Their damage is mainly caused by local defects caused by medium corrosion, erosion and mechanical damage. When the wall is thinned due to corrosion or erosion, which affects their strength and rigidity, they cannot be repaired and should be replaced.

During maintenance, the valve body and valve cover should first be tested for water pressure strength, and then use water, compressed air, kerosene or other media to check its tightness. The defects of the valve body and valve cover are generally repaired by welding, and the corresponding welding rods and welding processes are selected according to the different materials. The defective metal should be cleaned before welding, and it should be inspected and trimmed after welding, and the stress should be eliminated.

2. Inspection of the packing room The inspection of the packing room includes the replacement of packing and the inspection and repair of the stuffing box. When selecting packing, the use conditions and media conditions must be considered. Generally speaking, oil-impregnated asbestos packing is suitable for air, steam, water and heavy oil products at a certain temperature. Graphite asbestos packing can be used under high temperature and high pressure conditions, especially graphite asbestos packing with steel wire has better pressure resistance. Asbestos plus lead packing can be used for high temperature and frequently changing temperature media, and polytetrafluoroethylene asbestos packing or polytetrafluoroethylene braiding can be used for strongly corrosive media.