YCB arc gear pump seals should not the same fluid medium under different choices
YCB arc gear pump seals should not the same fluid medium under different choices
YCB arc gear pump , YCB Gear Pump : The pump consists of pump, pump cover , seal , steel , safety valves and other components, the structure is simple and durable. YCB gear pump for conveying solid particles and fibers , non-corrosive, temperature no higher than 80 ℃, the viscosity of 5 × 10-6 ~ 1.5 × 10-3m2 / s (5-1500cSt) of oil or a similar nature other liquid lubricants , and hydraulic drive systems. Flow 0.6 - 60 cubic meters / hour , pressure 0.6-2.5MPA. Overload protection as a safety valve , pressure relief valve total reflux pump discharge pressure of 1.5 times the rated .
The following is applicable media types and sealed
( A ) rubber asbestos packing XS250 ( limit temperature 250 ℃), rubber asbestos packing XS350 ( limit temperature 350 ℃):
Medium: steam, water, alkaline solution. Primary
(B ) Oil asbestos packing YS250 ( limit temperature ≤ 250 ℃), YS350 ( limit temperature ≤ 350 ℃): prominent feature of the product is packing containing lubricating , low friction , compression volume.
Medium: steam, air, industrial water , heavy petroleum products.
(C ) PTFE asbestos packing SMF: Temperature : -100 ~ +250 ℃, Medium: weak acid , alkali and other corrosive media.
(D ) oil , cotton, hemp packing YMM: Limit temperature : ≤ 120 ℃, Suitable medium: water , water , groundwater , water and so on.
(E ) PTFE fiber braided packing products into six grades.
During use , began allowing a small amount of filler leakage , to be used for some time , filling in a relatively stable state , and then adjust the packing gland . When must not start too tight , to prevent burn filler. ( Six ) carbon fiber braided seal packing : is a high strength , high modulus of new material , which has high strength, elastic modulus , high temperature resistance, chemical resistance, good thermal conductivity, and low coefficient of thermal expansion , and has self-lubricating .
In the beginning of the operation should be light tight packing gland , allowing a small amount of media leaks , after running for some time , and then gradually pressed the filler into a relatively stable stage. Carbon fiber PTFE braided packing (FTH-1), in the operation of such a leak is found , tighten the packing gland can be repeated .
( Seven ) phenolic fiber braided seal packing : high temperature , acid corrosion, adsorption , good insulation properties, low coefficient of friction , wear resistance, humans and the environment pollution-free, low price and so on. Mainly used in high-pressure piston pumps , high pressure pumps, acid pumps fiberglass , A ammonia pump , reciprocating pumps and deep well of oilfield packing . Performance in the table below :
For media
PH , organic solvents , oil , steam, and water.
( Eight ) expandable graphite ( flexible graphite ) materials : graphite itself has in addition to its excellent self-lubricating , corrosion resistance, high temperature resistance, radiation resistance, wear resistance , low coefficient of friction characteristics , but also has a soft , low density , compression resilient and the advantages of using a wide temperature range . PH of the medium can be applied is 0 to 14 . In addition to aqua regia , concentrated nitric acid, concentrated sulfuric acid and dichromate at high temperatures and a few other strong oxidizing medium is not recommended , but other media can be used. Before loading the stuffing box packing rings with a razor blade and cut a crossing , and then only to a certain axial torsion shaft sleeve , pressed into the stuffing box , the incision should be staggered every lap 900 or 1200 . When the operation began allowing traces of leakage , as time increases , the leakage will be reduced gradually. .
( Nine ) of carbon - graphite material : good thermal conductivity, electrical conductivity, chemical stability , thermal shock resistance , self-lubricating and workability . In terms Pump for centrifugal pumps , shielding pumps , diesel dispensing pump , submersible pump, water pump , heat pumps , nuclear two pumps, boiler feed pumps, pump and other seal, rose ring seal , mechanical seal rings , shaft the sealed rotary vane and other occasions.
Ten, rubber
( A ) Natural rubber : with excellent flex resistance , good abrasion resistance, cold resistance and insulation resistance, high tear strength. Aging, poor weather, oil resistance, solvent resistance is also poor. The use of natural rubber compounds made of plastic pumps , suitable temperature below 78 ℃. Applicable to transport a variety of abrasive slurry and weak base solution , but not for transporting acids, oils, aliphatic and aromatic solution .
(B ) nitrile rubber : It is currently the most widely used oil and rubber varieties, with a range of superior performance , high abrasion resistance than natural rubber from 30 to 45% , heat resistance than natural rubber, styrene-butadiene rubber are good. However, nitrile rubber, weather resistance was poor. Nitrile rubber compounds made of plastic pumps , the maximum temperature is 95 ℃. The plastic pump is resistant to various kinds of plastic animals, vegetable oil , mineral oil and glycol .
(C ) Butyl rubber : Butyl rubber using rubber lined pump parts made of plastic material , the acidic slurry for work . Maximum use temperature of 100 ℃, can be resistant to acid and alkali ( such as hydrochloric acid , sodium hydroxide ) , but high concentrations of oxidizing acids ( such as sulfuric acid, concentrated nitric acid ) causes the degradation of butyl rubber .
( Four ) fluorine rubber : After curing the rubber with excellent heat-resistance , ozone resistance, oil resistance and resistance to various chemical etching performance. However, fluorine rubber processing , rubber adhesive badly more general terms , the price is relatively expensive. Fluorine rubber compounds made of plastic pumps , allowing the use of the maximum temperature up to 170 ℃ ( in the general media ) .
XI, ceramics
( A ) , corundum ceramics ( the main component of AI2O3): generally have high hardness, excellent wear resistance and chemical stability , and high insulation , high melting point . Pump is mainly used in the ceramics industry, pump and mechanical seal ring under special working conditions and so on . In addition to hydrofluoric acid and fluorine-containing ceramic some other substances, and hot alkali solution or concentrated , almost all corrosive media capability , including hot concentrated nitric acid, sulfuric acid, hydrochloric acid, aqua regia , salt solutions , organic solvents and the like.
(B ) silicon nitride ceramics: thermal shock resistance than alumina ceramics , and other properties of alumina ceramics basically the same.
(C ) silicon carbide ceramic : It has excellent chemical resistance, high mechanical strength , wear resistance, high temperature resistance, self- lubricating, low friction coefficient , etc. , it can be used as high-temperature structural materials for the pump mechanical seal , magnetic pump shaft and other , more obvious advantages than ordinary ceramics. Silicon carbide is an ideal pay friction material , pairing it with a combination of carbon graphite , the dry sliding friction coefficient than aluminum oxide , carbide smaller , PV value is higher than that of alumina and tungsten carbide . Excellent wear resistance of silicon carbide ceramics , apart from a few media such as hydrofluoric acid , corrosion resistant to almost all chemicals , including strong corrosive liquid concentrated nitric acid, sulfuric acid and hydrochloric acid.
XII permanent magnet material
( A ) ferrite permanent magnet material : Compared with metallic magnetic materials with high coercivity, high insulation resistance, good resistance to external magnetic fields and low prices , etc., can be used both inside and outside of the rotor magnet magnetic pump steel.
(B ) rare earth permanent magnetic materials : excellent magnetic properties, particularly coercivity and energy product permanent magnet materials are available in the highest , it is suitable for permanent magnetic pump on the ground , but, because these materials are expensive and could not be universally applied.
XIII, other materials
( A ) Pump Paint: protective , decorative and marking role . By using the effect of anti-rust paint , varnish , lacquer acid etc. ; by brushing level of primer, paint , putty and so on.
( B) the centrifugal paper pad material :
( C) the pump felt material : used in the manufacture of oil seals, oil seal friction point that does not leak, but also to prevent water and dust intrusion. Of fine wool felt, wool felt semi- coarse and coarse wool felt .
(Iv ) industrial vulcanized rubber sheet (GB5574-85): ordinary rubber sheet , acid rubber sheet, oil and rubber plates, heat-resistant rubber sheet .
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