in pipeline valve used in a wide variety, different structure, it is the most easily damaged pipeline fittings, maintenance for each Industrial Valves, shall be carried out according to the concrete structure, the pipe valve used in a wide variety, different structure, it is the most easily damaged pipeline fittings, maintenance for each valve, shall be carried out according to the concrete structure.

1: body and cover the maintenance of body and cover is the most outside the valve closed shell, to bear the pressure of medium, the additional force when operation, other parts of valve weight, as well as the joint flange or thread tension. Body and cover the request has the certain strength and stiffness, their damage is mainly medium corrosion, erosion and mechanical damage caused by local defects, and when the wall thinning is caused by corrosion or erosion, and affects their strength and stiffness, cannot repair, should be replaced.

maintenance, body and cover should be in the water pressure strength test, water, compressed air, kerosene or other medium to test its rigor. Body and cover defects generally adopt the method of repair welding, depending on the material selects the corresponding electrode and welding process. Before welding repair defective metal should be clean, still should inspect and repair after repair welding, and eliminating stress.

2: packing room equipment packing room overhaul repair and stuffing box including packing replacement parts inspection. When choosing packing, using conditions and the situation of medium must be considered. In general, the oil cut asbestos packing is suitable for a certain temperature of the air, steam, water and heavy oil products. Graphite asbestos packing can be used in high temperature and high pressure conditions, especially in the clip has a steel wire of the graphite asbestos packing pressure resistance is better. High temperature and medium temperature change frequently used asbestos leaded packing. Strong corrosive medium available invasion ptfe asbestos packing or ptfe braid.

keywords: valve valve repair techniques
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