Chemical pump sealing material main material: 1, asbestos packing XS250 (limit temperature 250 ℃), rubber asbestos packing XS350 (temperature limit of 350 ℃), rubber asbestos packing Applicable medium: steam, water, alkaline Solution. 2, oil asbestos packing YS250 (temperature limit of use ≤ 250 ℃), YS350 (temperature limit of use ≤ 350 ℃): Oil asbestos packing is salient features packing oil, friction coefficient is small, large amount of compression. Applicable medium: steam, air, industrial water, heavy petroleum products. 3, PTFE asbestos packing SMF temperature: -100 ~ +250 ℃, suitable medium: weak acid, alkali and Other corrosive media. 4, oil-impregnated cotton, Ma Ma root YMM: limit temperature: ≤ 120 ℃, the media: river, tap water, groundwater, sea water and so on. 5, PTFE fiber braided packing, the product is divided into six grades. In use, begin to allow a small amount of filler leakage, to be used for some time, the filler is relatively stable, and then adjust the packing gland. Do not over-press at the beginning to prevent burning out of packing. 6, Carbon fiber braided sealing packing is a kind of new material with high strength and high modulus. It has the advantages of high strength, large elastic modulus, high temperature resistance, chemical resistance, good thermal conductivity, low thermal expansion coefficient, etc., Sex. The initial operation should be lightly packed gland, allowing a small amount of media leakage, run for a period of time, and then gradually compact, so that the filler into a relatively stable stage. Carbon fiber Teflon braided packing (FTH-1). If leaks are found during operation, tighten the packing gland several times. 7, Phenolic fiber braided packing has the advantages of high temperature resistance, acid medium resistance, good adsorption and thermal insulation, small friction coefficient, wear resistance, no pollution to the human body and the environment, low price and so on. The seal packing is mainly used in high pressure piston pump, high pressure water pump, FRP acid pump, ammonia pump, reciprocating pump and oil field deep well pump packing seal. Applicable medium: acid, organic solvents, oil, steam, water and so on. 8, Expanded graphite (flexible graphite) material, in addition to the graphite itself has excellent self-lubricating, corrosion resistance, high temperature resistance, radiation resistance, abrasion resistance, low coefficient of friction and other characteristics, but also has flexibility, low density, Resilience and the use of a wide range of temperature and other advantages. The applicable medium PH value is 0 ~ 14. In addition to aqua regia, concentrated nitric acid, concentrated sulfuric acid and high temperature dichromate and a few other strong oxidizing medium is not recommended, other media can be used. Prior to loading the stuffing box, the packing ring is cut with a razor blade and then only axially deflected to some extent. Set it on the shaft and press it into the stuffing box. The notch for each turn should be offset by 900 or 1200. Allow a slight leakage at the beginning of operation, with the increase of time, the amount of leakage will gradually decrease. 9, carbon - graphite materials: a good thermal conductivity, electrical conductivity, chemical stability, thermal shock resistance, self-lubricating and workability. In the pump industry, used for centrifugal pump, shield pump, diesel distribution pump, submersible pump, water pump, high temperature hot oil pump, nuclear two pump, boiler feed pump, pump and other face seal, ring seal, mechanical seal ring, shaft To seal, rotary and other occasions. 10, rubber (A) of natural rubber: excellent resistance to flexural flexibility, good wear resistance, cold resistance and insulation, high tear strength. Anti-aging, poor weather resistance, oil, solvent resistance is also poor. Made of natural rubber glue pump, suitable for working temperature below 78 ℃. Suitable for conveying a wide range of abrasive slurries and weak acid, weak base solution, but not for the delivery of strong acids, oils, aliphatic and aromatic solutions. (B) nitrile rubber: is currently the most widely used oil resistant rubber varieties, with a series of superior performance, wear resistance 30% to 45% higher than natural rubber, high temperature resistance than natural rubber, styrene butadiene rubber are good. But nitrile rubber weathering resistance is poor. NBR rubber glue pump, the maximum temperature is 95 ℃. The glue glue pump resistant to all kinds of animal and vegetable oils, mineral oil and glycol. (C) butyl rubber: butyl rubber rubber lined rubber pump parts, suitable for acid mud work. The maximum temperature is 100 ℃, resistant to strong acids and bases (such as hydrochloric acid, sodium hydroxide), but high concentrations of oxidizing strong acids (such as concentrated sulfuric acid, concentrated nitric acid) will butyl rubber degradation. (D) Fluoroelastomer: This rubber vulcanized with excellent heat resistance, ozone resistance, oil and resistance to various chemicals erosion of performance. However, fluorine rubber in the processing, bonding is inferior to general-purpose rubber, the price is more expensive. Fluorocarbon rubber glue manufacturing pump, allowing the use of the highest temperature up to 170 ℃ (in normal medium). 11, ceramic (A), corundum ceramic (main component AI2O3): generally has a very high hardness, good wear resistance and chemical stability, and high insulation, high melting point. In the pump industry is mainly used for special conditions of the ceramic pump and mechanical seal rings. In addition to hydrofluoric acid and some other fluorine-containing substances, as well as hot or concentrated lye, ceramics can withstand almost all corrosive media including hot concentrated nitric acid, sulfuric acid, hydrochloric acid, aqua regia, salt solutions, organic solvents and the like. (B) silicon nitride ceramic: thermal shock resistance is superior to alumina ceramic, other properties and alumina ceramic basically the same. (C) silicon carbide ceramic: with excellent chemical resistance, high mechanical strength, good wear resistance, high temperature, good self-lubricating, low coefficient of friction characteristics, it can be used as a high temperature structural materials for the pump Mechanical seal, magnetic pump shaft, more than ordinary ceramic has obvious advantages. Silicon carbide is an ideal tribological material, which is paired with carbon graphite. Its coefficient of dry sliding friction is smaller than that of alumina and cemented carbide, and its PV value is higher than that of alumina and cemented carbide. Silicon carbide ceramic wear resistance, in addition to hydrofluoric acid and a few other media, almost all chemicals resistant to corrosion, including concentrated nitric acid, sulfuric acid, hydrochloric acid and other strong corrosive liquid. 12, Permanent Magnet Material (I) Ferrite Permanent Magnet Material: Compared with metal permanent magnet material, it has the advantages of high coercivity, high insulation, good resistance to external magnetic field, low price, etc. It can be used as magnetic force Magnet inside and outside the pump rotor. (B) of rare earth cobalt permanent magnet materials: Has excellent magnetic properties, especially coercivity and energy product is the existing permanent magnet material
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