Welding Flange With Neck ,Long Weld Neck Flange,Weld Neck Pipe Flanges,Reducing Weld Neck Flange CHINA·SNGONG FLANGE MANUFACTURING CO., LTD. , https://www.sngonges.com
Valve repair skills
With the social and economic development, the use of valves is more and more widely used in the pipeline valves a wide range of different structures, but also the most vulnerable pipe fittings, maintenance of each valve should be based on specific Structure, in the pipeline used in a wide variety of valves, different structures, but also the most vulnerable pipe accessories, overhaul of each valve. 1, the valve body and cover the valve body and valve cover is the outermost closed housing, to withstand the media pressure, additional force during operation, the weight of other parts of the valve, and the connection Flange or threaded tight The body and bonnet require a certain degree of strength and stiffness, their damage is mainly caused by medium corrosion, erosion and mechanical damage caused by local defects, when the wall erosion due to erosion or erosion, and even affect their strength And stiffness, it can not be repaired and should be replaced. Overhaul, the valve body and bonnet should be first hydraulic pressure test, and then water, compressed air, kerosene or other media to test its tightness. Body and bonnet defects Generally use the method of repair welding, according to the material of the different selection of the corresponding welding rod and welding process. Before welding repair should be flawed metal clean, repaired after welding should also be checked and trimmed and eliminate stress. Overhaul of the stuffing room includes replacement of stuffing and inspection and repair of stuffing box parts. When using stuffing, the condition of use and the condition of the medium must be considered. In general, asbestos packing is suitable for a certain amount Degree of air, steam, water and heavy oil products Graphite asbestos packing can be used under high temperature and pressure conditions, especially with graphite wire packing graphite asbestos packing better pressure High temperature and temperature changes of the medium can be asbestos plus lead packing Strong corrosive medium can be used to enclose PTFE asbestos packing or PTFE woven.