Butterfly valve has been in the chemical industry, metallurgy, petroleum and other industries have been widely used. Of course, mostly soft-sealed butterfly valve. However, in recent years, in some areas of high temperature; high pressure, strong corrosion, three eccentric metal seal butterfly valve is widely used. Three eccentric metal seal butterfly valve structure is characterized by body and valve seat is Siamese member, seat sealing surface layer surfacing temperature, corrosion resistant alloy material. Multi-layer soft stacked ring fixed to the valve plate, this butterfly valve compared with the traditional butterfly valve with high temperature, light operation, opening and closing without friction, closed with the torque of the transmission mechanism to compensate for increased sealing, improved butterfly valve The sealing performance and extend the service life of the advantages. Of course, this three-eccentric metal sealing butterfly valve also has its inherent disadvantages: 1, the valve plate structure is relatively thick, large flow resistance, it is not suitable for DN200 small diameter pipe; 2, normally open pipe, valve seat sealing surface by Front flushing, affecting the fixed in the valve plate on the multi-layer hard laminated ring, a long time will affect the sealing performance; 3, three eccentric structure principle, the sealing surface between the valve plate and the valve seat is sealed by the transmission Torque valve plate to the seat. The positive flow state, the higher the media pressure seal squeeze tight. When the flow medium countercurrent media pressure increases with the pressure between the valve plate and valve seat unit pressure is less than the medium pressure, the seal began to leak. There is now a new type of three eccentric butterfly valve: It is characterized by: the seat ring by the soft T-ring seal on both sides of multi-layer stainless steel sheet. The sealing surface of the valve plate and the valve seat is an oblique conical structure, and a temperature-resistant and corrosion-resistant alloy material is deposited on the oblique conical surface of the valve plate; the spring fixed between the adjusting ring plate and the adjusting bolt on the pressure plate is provided with the structure. This structure effectively compensates for the tolerance band between the sleeve and the valve body and the elastic deformation of the valve stem under the medium pressure and solves the sealing problem existing in the process of transporting the valve in the bidirectional interchangeable medium. The soft T-shaped multi-layer stainless steel sheet on both sides of the seal ring, with the advantages of both metal seal and soft seal, both in low temperature and high temperature conditions, have zero leakage of sealing performance. With the development of mechanical technology, butterfly valve space is also more and more widely used, many shortcomings have also been improved.
Thermal Spray Materials
Metals, alloys and composite powders commonly used in thermal
spray hardfacing technology and coating service. These unique powders are
instantly heated by thermal spraying (welding) methods such as high temperature
flame or explosive flame, and are sprayed and deposited on the cold or hot
workpiece surface with high-speed heat flow in a molten or semi-melted state to
form a surface Reinforcing layer, in order to improve the wear resistance,
corrosion resistance, heat resistance, oxidation resistance or repair of
external dimensions of the workpiece surface. XTC produces WC, CrC, Oxide
Ceramic, Boride Powder, Metal Alloy Powder, Pure Metal and Spray Wire, etc.
product. For HVOF/HVAF/plasma/Flame spray coating and applications. Meet the
wear and corrosion resistance requirements of different surfaces.
WC, CrC oxide ceramic powder and boride
products are excellent in wear resistance and high temperature corrosion
resistance. Taking WC products as an example, the hardness can reach
HV1300-1500, and the temperature of CrC products can reach 800 degrees Celsius.
Metal alloy powder, Pure Metal and Spray
Wire products have more applications in glass mold, steel and machinery
industries. And XTC products are now become more and more popular in Metal
spray coating and thermal spray coating industry.
Coating Service,Metal Spray Coating,Flame Spray Coating,Thermal Spray Coating
Luoyang Golden Egret Geotools Co., Ltd , https://www.xtclasercladding.com