Eccentric butterfly valve selection and application conditions introduction
Double eccentric seal butterfly valve adopts eccentric structure design, its valve main structure consists of valve body, butterfly plate, valve seat, valve stem and transmission mechanism and other components, the valve seat adopts removable structure, and according to the physical and chemical media characteristics of different media, choose the corresponding corrosion-resistant, light-resistant, aging-resistant materials, can be widely used in water supply and drainage, sewage, construction, air conditioning, petroleum, chemical, food, pharmaceutical, light textile, paper making, water and electricity, shipping, metallurgy, energy systems and other fluid pipelines as a regulating and intercepting device to use, Hydroelectricity, ships, metallurgy, energy systems and other fluid pipelines as a regulating and intercepting device to use.
Double eccentric butterfly valve usually adopts teflon material as its sealing seat, and metal sealing seat can also be used to expand its application in high temperature field. However, the sealing of the double eccentric butterfly valve with metal seal seat still belongs to the position sealing structure, that is, the sealing surface of the butterfly plate and the valve seat is in line contact, so it cannot resist high pressure, which will certainly lead to a larger leakage when applied in the high pressure system, so the double eccentric butterfly valve with metal seal seat should be avoided as much as possible in the high pressure or the system that requires tight cutoff.
Three eccentric butterfly valve to raise the length of various valves, to avoid the short of various valves, more and more attention by the majority of users and designers. Its maximum pressure level can reach 2500 pounds, the standard caliber can do 48 inches, and the clamp, lug, flange, ring joint, butt welding, jacket, various structure lengths can be corresponded to, because the material selection margin is large, high and low temperature and various acids, alkalis and other corrosive media can also be corresponded to freely. Especially in large diameter, with its zero leakage advantage, it is continuously replacing the thick gate valve and ball valve in shut-off valve, and likewise, with its excellent regulating function, it is continuously replacing the bulky globe valve in regulating valve.
So far, eccentric seal butterfly valves are used in various important pipelines for process control in major industrial fields such as oil and gas extraction, offshore platforms, oil refining, petrochemical, inorganic chemical, energy generation, etc., including China. In the actual project, if the working pressure of the system is not less than 1.0 MPa or in the important parts that need to be opened frequently, eccentric butterfly valves can be used.