Class 300 Welded Neck Flange
Offer 300 Ansi,Flange Ansi 300,Flange Ansi B16 5 Class 300 From China Manufacturer
300 Ansi,Flange Ansi 300,Flange Ansi B16 5 Class 300,Class 300 Welded Neck Flange
Professional 300 Ansi manufacturer is located in China, including Flange Ansi 300,Flange Ansi B16 5 Class 300,Class 300 Welded Neck Flange, etc.
300 Ansi,Flange Ansi 300,Flange Ansi B16 5 Class 300,Class 300 Welded Neck Flange Jiangyin Zhonghai Precision Machinery Co.,Ltd , https://www.zhonghaiprecision.com
Packing is a dynamically sealed packing material used to fill the packing chamber space to prevent leakage of media through the stem and packing chamber space. Packing seal is one of the key parts of the valve products, in order to achieve good sealing effect, on the one hand is the filler material itself, the structure to meet the needs of medium conditions, the other is a reasonable packing installation method and from the stuffing box Structurally considered to ensure a reliable seal. First, the requirements of the filler itself 1, to reduce the friction of the filler on the valve stem; 2, to prevent the filler on the stem and stuffing box corrosion; 3, to meet the needs of medium conditions. Second, the commonly used filler varieties Because the information introduced for a variety of working conditions under the conditions of more than 40 species, while the most common valve in general, however, several or more than a dozen 1, packing type A, asbestos packing: XS250FXS350FXS450FXS550F ; B, oil asbestos packing: YS450FYS350FYS450F; C, impregnated PTFE asbestos packing; D, flexible graphite braided packing: According to the different reinforced materials were resistant to temperature 300 ℃ 450 ℃ 600 ℃ 650 ℃; E, poly Tetrafluoroethylene braided packing; F, semi-metallic braided packing, with stainless steel wire, copper wire asbestos as the core. Appearance with copper wire, stainless steel wire, Monel wire, solid Kang Ni Seoul asbestos wire knit together. Depending on the use of its surface with graphite, mica, molybdenum disulfide lubricant treatment. Some asbestos as the core, coated with graphite lubricated graphite twisted platinum made. 2, molding filler molding filler that is a variety of molding filler A, rubber B, Nylon C, PTFE D, filled with PTFE (reinforced PTFE) reinforced materials for the glass fiber, usually 8 ~ 15% glass fiber. E, flexible graphite ring Third, matters needing attention 1, with packing packing cut 45. Incision, the installation of each circle incision phase 180; 2, under high pressure PTFE molding filler should pay attention to its cold flow characteristics; 3, flexible graphite ring alone seal effect is not good, and flexible graphite braided packing or YS450 (see temperature conditions) combination of stuffing box installed in the middle of a flexible graphite ring, braided packing at both ends can also be a layer of flexible layer that is a layer of woven braided packing, packing box can also put the middle of the ring, ring Up and down into a combination of two groups of packing; 4, graphite on the stem packing box Corrosion should be used in the choice of corrosion inhibitor packing; 5, flexible graphite in aqua regia, concentrated sulfuric acid, concentrated nitric acid and other media do not apply ; 6, the dimensional accuracy of the stuffing box surface roughness, stem size accuracy and surface roughness is the key to the tightness of the molding filler; Keywords Search