Main: mud valve, killing pipe, manifold, manifold, high-pressure flange, high-pressure movable elbow, high-pressure pipe connection (oil)
The packing is a dynamic sealing material used to fill the packing chamber space to prevent media leakage through the valve stem and packing chamber space. Packing seal is one of the key parts of valve products. To achieve a good sealing effect, on the one hand, the material of the packing itself, the structure should be adapted to the needs of the medium working conditions, and the other is a reasonable packing installation method and from the stuffing box. Structural considerations to ensure a reliable seal.
First, the requirements of the filler itself 1, reduce the friction of the filler on the valve stem;
2. Prevent the corrosion of the filler on the valve stem and the stuffing box;
3. Adapt to the needs of media conditions.
Second, the commonly used filler varieties because the data introduced for a variety of conditions under the conditions of more than 40 varieties, and the general valve in the Zui commonly used several or a dozen, 1, packing type A, rubber asbestos packing: XS250FXS350FXS450FXS550F ;
B, oil banned asbestos packing: YS450FYS350FYS450F;
C, immersed in tetrafluoroethylene asbestos packing;
D, flexible graphite braided filler: according to the different materials, the temperature can be respectively 300 ° C 450 ° C 600 ° C 650 ° C;
E, polytetrafluoroethylene braided filler;
F, semi-metal braided filler, with asbestos with stainless steel wire and copper wire as the core. The exterior is woven with an asbestos wire of copper wire, stainless steel wire, monel wire, and solid nickel wire. The surface is treated with graphite, mica or molybdenum disulfide lubricant depending on the application. Some are made of asbestos and twisted with lubricated graphite-coated copper and platinum.
2, molding filler molding filler, that is, press-formed filler, its varieties are A, rubber B, nylon C, polytetrafluoroethylene D, filled polytetrafluoroethylene (reinforced PTFE) reinforcing material for glass fiber, generally 8 ~ 15% glass fiber.
E, flexible graphite ring III, matters needing attention 1, the packing type packing is used when cutting 45. Incision, each turn of the incision is 180 wrong when installed;
2. Pay attention to its cold flow characteristics when using polytetrafluoroethylene forming filler under high pressure;
3, flexible graphite ring alone used sealing effect is not good, should be combined with flexible graphite braided packing or YS450 (see temperature), the packing box is equipped with flexible graphite ring in the middle, woven packing at both ends, can also be layered assembly is a layer Flexible graphite layer of woven filler, can also be placed in the middle of the stuffing box, the spacer ring is divided into two groups of assembled packing;
4. Graphite should be corroded during the use of the valve packing box. The packing with mild corrosion agent should be selected.
5. Flexible graphite is not suitable in mediums such as aqua regia, concentrated sulfuric acid and concentrated nitric acid;
6, dimensional accuracy of the stuffing box surface roughness, stem size accuracy and surface roughness is the key to affect the sealing of the molding filler;
The packing is a dynamic sealing material used to fill the packing chamber space to prevent media leakage through the valve stem and packing chamber space. Packing seal is one of the key parts of valve products. To achieve a good sealing effect, on the one hand, the material of the packing itself, the structure should be adapted to the needs of the medium working conditions, and the other is a reasonable packing installation method and from the stuffing box. Structural considerations to ensure a reliable seal.
First, the requirements of the filler itself 1, reduce the friction of the filler on the valve stem;
2. Prevent the corrosion of the filler on the valve stem and the stuffing box;
3. Adapt to the needs of media conditions.
Second, the commonly used filler varieties because the data introduced for a variety of conditions under the conditions of more than 40 varieties, and the general valve in the Zui commonly used several or a dozen, 1, packing type A, rubber asbestos packing: XS250FXS350FXS450FXS550F ;
B, oil banned asbestos packing: YS450FYS350FYS450F;
C, immersed in tetrafluoroethylene asbestos packing;
D, flexible graphite braided filler: according to the different materials, the temperature can be respectively 300 ° C 450 ° C 600 ° C 650 ° C;
E, polytetrafluoroethylene braided filler;
F, semi-metal braided filler, with asbestos with stainless steel wire and copper wire as the core. The exterior is woven with an asbestos wire of copper wire, stainless steel wire, monel wire, and solid nickel wire. The surface is treated with graphite, mica or molybdenum disulfide lubricant depending on the application. Some are made of asbestos and twisted with lubricated graphite-coated copper and platinum.
2, molding filler molding filler, that is, press-formed filler, its varieties are A, rubber B, nylon C, polytetrafluoroethylene D, filled polytetrafluoroethylene (reinforced PTFE) reinforcing material for glass fiber, generally 8 ~ 15% glass fiber.
E, flexible graphite ring III, matters needing attention 1, the packing type packing is used when cutting 45. Incision, each turn of the incision is 180 wrong when installed;
2. Pay attention to its cold flow characteristics when using polytetrafluoroethylene forming filler under high pressure;
3, flexible graphite ring alone used sealing effect is not good, should be combined with flexible graphite braided packing or YS450 (see temperature), the packing box is equipped with flexible graphite ring in the middle, woven packing at both ends, can also be layered assembly is a layer Flexible graphite layer of woven filler, can also be placed in the middle of the stuffing box, the spacer ring is divided into two groups of assembled packing;
4. Graphite should be corroded during the use of the valve packing box. The packing with mild corrosion agent should be selected.
5. Flexible graphite is not suitable in mediums such as aqua regia, concentrated sulfuric acid and concentrated nitric acid;
6, dimensional accuracy of the stuffing box surface roughness, stem size accuracy and surface roughness is the key to affect the sealing of the molding filler;
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