The valve packing sealing material is filled, used to fill space, to prevent the media from the stem and packing chamber leakage. Packing seal is one of the key parts of the valve products, to achieve a good sealing effect, is a filler material, structure to meet the needs of medium condition, on the other hand, it is reasonable for the filler installation method and to ensure reliable sealing from stuffing structure consideration.
Firstly, packing their own requirements
1, to reduce the friction of the packing of the valve stem;
2, to prevent the corrosion of the valve stem packing and stuffing box;
3, to meet the needs of medium condition.
Secondly, commonly used packing types
Because the data are presented for various conditions of more than 40 varieties, and universal valves most commonly used but several or dozens of
1, packing type
A, rubber asbestos packing: XS250FXS350FXS450FXS550F;
B, the oil ban asbestos packing: YS450FYS350FYS450F;
C, Teflon impregnated asbestos packing;
D, flexible graphite braided packing: according to the reinforced material the different temperature 300 ℃ of 450 ℃ and 600 ℃ of 650 ℃;
E, PTFE braided packing;
F, a metal braided packing, stainless steel wire, copper wire to clamp the asbestos as the core. Copper wire, stainless steel wire, Monel wire, solid Kang Ni volls clip with the appearance of the asbestos braid. According to the use of its surface with mica, graphite, molybdenum disulfide lubricant processing. Also some asbestos as core, copper foil twisted coated graphite lubrication and. L good, good.
2, molding packing
Molding packing is pressed filler has the varieties
A, rubber
B, nylon
C, PTFE
D, filled polytetrafluoroethylene (PTFE) reinforcement material for glass fiber, generally 8 ~ 15% glass fiber.
E, flexible Shi Mohuan
Finally, pay attention to the problem
1, packing filler cut by 45. Incision, installation of each ring incision phase error 180;
2, under high pressure using polytetrafluoroethylene molding packing to the attention of the cold flow properties;
3, flexible graphite ring alone bad sealing effect, and flexible graphite braided packing or YS450 (see temperature) used in combination, the stuffing box is arranged in the middle of flexible graphite ring, both ends with braided packing, can also be a layer of flexible graphite layer assembly is a layer of braided packing, also can put in the stuffing the middle spacer ring the spacer ring, upper and lower respectively two combinatorial assembly filler;
4, graphite should choose slow corrosion agent packing corrosion of the valve stem packing at;
5, flexible graphite is not applicable in aqua regia, concentrated sulfuric acid, concentrated nitric acid medium;
The size precision, surface roughness of 6 stuffing, precision and surface roughness of stem size is key to forming packing seal.
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