The use of butterfly valve in the pipeline system is quite a lot of, its according to seal form, such as the material of different can also be divided into all sorts of small category. One of hard seal butterfly valve is among the more common one, and use a metal as the main material of the sealing, and internal use three eccentric structures called triple eccentric metal hard seal butterfly valve. The name of the butterfly valve and trival, its characteristic is more complex. Being triple eccentric structure, its internal multi-layer hard sealing ring is fixed on the valve plate, the cascade in the valve plate normally open state, the medium will its sex into positive impact, and are vulnerable to erosion. This is in fact most of the hard seal butterfly valve by bringing small faults. And triple eccentric metal hard seal butterfly valves because of its special structure, so the overall thickness will be higher, the fluid resistance is bigger, so usually can't be used in a path DN200 valves. Triple eccentric butterfly valve is widely used in medium temperature of 425 ℃ or less, metallurgy, electric power, petrochemical industry, water supply and drainage, and municipal construction and other industrial pipelines, used to adjust flow cutoff and body. Material is divided into: cast iron, cast steel, stainless steel and other special metal materials. Nature of refractory structure fireproof construction many valves are claimed to have, but the great part of the valve in order to reduce the leakage and use the hard and soft double seat structure, actually this is very dangerous. Because a fire sealing seat the incomplete combustion of metal support seat causes stress and temperature deformation, resulting in refractory function failure. So, the current Europe and the United States is gradually eliminate this kind of refractory valve more in name than in reality. Tritrc because is zero leakage, so don't need soft seal mobility, belongs to the real nature of refractory structure, and refractory API607, API6FA and BS6755Part2 inspection approval certificate. This ensures that Tritec can be used in petroleum, petrochemical and other dangerous areas. In conservative Britain, used by the various key parts of the north sea oil valve, Tritec mopping up almost all is the best example. High packing structure of the valve leakage issues, traditionally tend to focus on the seat of the leakage, namely, internal leakage, and ignores the fact that the packing department leakage, leakage. But in fact, in the current environment problem is increasingly attention far greather than in contemporary society, leakage of leakage has become an indisputable fact. Tritec triple eccentric butterfly valve is a transformation of the valve, the valve lever is 90 ° rotating only just, this is the gate valve, globe valve, the valve stem action for spiral rotary reciprocating motion, the packing department by compared the wear degree is low, relatively long service life, more because Tritec in the structure of packing seal and prevent the external leakage, to the highest standard of design, thus can external leakage test under the EPA21 according to specifications, standards, although sealing performance guarantee in the 100 parts per million triple eccentric metal hard seal butterfly valve has shortcomings of ordinary hard seal butterfly valve, but the three eccentric structure also brings its unique strengths, makes it also played a good role in pipeline system. Soft sealing butterfly valve, as a kind of used to implement the pipeline system of cut and flow control components, has been in the petroleum, chemical industry, metallurgy, water and electricity is widely used in many fields such as extremely. In butterfly valve technology has been known, its seal form with seal structure, sealing materials for rubber, ptfe, etc. Because of the limitation of structural features is not adapt to the high temperature, high pressure and corrosion resistance, wear resistance, etc. Existing a more advanced butterfly valve is a triple eccentric metal hard seal butterfly valve, the valve body and seat for the Siamese components, valve seat sealing surface layer welding temperature resistant, corrosion resistant alloy material. Multilayer soft fold type sealing ring is fixed on the valve plate, the butterfly Industrial Valves and the traditional butterfly valve compared with high temperature resistant, convenient operation, opening and closing without friction, closed as the actuator torque increases to compensate for sealing, improve the butterfly valve sealing performance and prolong the service life of the advantages of soft sealing butterfly valve seal several types and main functions: 1. NBR NBR will generally as a butterfly valve seat materials used, temperature tolerance is not very good, so make use of butterfly valve generally not used high temperature environment. But the nitrile rubber abrasion resistance and resistance to deformation ability is very good. 2. Ethylene propylene rubber ethylene-propylene rubber temperature range and nitrile rubber are similar, but on the upper limit of temperature is higher than nitrile rubber for a decade or two degrees, is also a major as a butterfly valve seat materials. Its advantage is that the insulation performance is good, excellent ozone resistance, medium and inorganic reactions will not occur. So using ethylene propylene rubber to make butterfly valves are generally used in water and alcohol pipeline transportation. Wenzhou worm gear plastic butterfly valve 3. Ptfe teflon temperature resistance is very outstanding, and has a strong resistance to chemicals, also known as the strong ability to resist corrosion. But due to some butterfly valve special need, can to improvement of ptfe, cancel its insulation performance, make the teflon insulation performance is not guaranteed.
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