On the one hand, the fossil fuel energy is increasingly scarce. On the one hand, people are constantly increasing their demand for petrochemical energy. While continuously seeking new sources of energy, what is more important now is the rational application and control of existing energy sources. Leakage and sealing problems are the most troublesome thing in energy extraction, transportation and use. They are also the culprit in the deteriorating global warming climate. The new three eccentric butterfly valve is born in this partial demand sound, it can play a role in the regulation of all kinds of environmental cut off. Let's start with the principle of "three eccentric butterfly valve". In the structure, the valve body of the butterfly valve has a transverse valve port (that is, the valve diameter) connected with the pipe. A valve plate is arranged in the valve port, Body and valve plate. The valve plate is provided on the edge of the outer spherical surface, the valve port is provided with the outer spherical surface with a sealing surface, the sealing surface and the outer spherical seal to form a sealed line with the axis of the shaft eccentric distance a, The lateral centerline of the valve plate that is, the centerline of the valve port and the shaft centerline eccentricity b, the outer spherical surface of the connection line and the valve port angle α, which is the principle of three eccentric butterfly valve. It cleverly put the three eccentricity of the "three eccentric butterfly valve" on the valve plate and the part of the outer spherical structure on the outer edge of the valve plate.This structure needs to be completed on the CNC machine with a simple designed fixture, the outer eccentricity Spherical polished to achieve the roughness Ra0.4, spherical chrome or heap too Lai alloy, the hardness reached HRC45 ~ 60. The eccentric angle on the valve plate, the seat ring with the pressure on the valve body pressure, so to solve Ordinary three eccentric butterfly valve processing Difficulties, body, valve plate, valve seat can not be used interchangeably, the maintenance cost is too high and a series of problems, and all the parts modular, simple warehouse management, simple processing, easy maintenance, reduce spare parts costs. Suitable for the production of large-caliber valves, cut off in the oil pipeline, metallurgical steel mills, gas main pipe regulation, cut off, chemical refining, catalysis, cracking, propylene oxide, polyethylene, polypropylene and other media devices cut off, Outflow regulation cut off, thermal power station cooling water system, natural gas, lye, seawater, acid and other industries are widely used.Extended bonnet, seat using PCTFE / Kel-f, mainly for liquid air, liquid oxygen, Liquid nitrogen and other cryogenic occasions -183 ~ -196 º .. Butterfly valve structure is simple, small size, light weight, only a few components and only need to rotate 1.5º to quickly open and close, easy to operate, while the valve has a good Of the fluid control characteristics of the butterfly valve is fully open position, the thickness of the disc is the only medium resistance through the valve body, so through the valve The resulting pressure drop is small, so it has better flow control characteristics.When the butterfly valve is closed, the pressure between the outer surface of the valve plate and the seat sealing surface pressure generated by the drive torque applied to the shaft. Coupled with M-type elasticity The elastic compensation of the valve seat not only can control the pressure but also can improve the sealing performance of the triple eccentric butterfly valve and greatly increase the service life.We all know that the control valve can be divided into straight stroke and angle Stroke. Straight travel valve is the closure element (spool, valve plate, etc.) in the fluid channel to do linear motion; angular stroke valve is the closure element in the fluid channel to make rotary motion .Stroke valve medium flow path is complex, was S-shaped , So the flow resistance, flow capacity is small, so the flow coefficient Kv value is small, the straight stroke of the complex flow of the medium easy to precipitate in the throttle near the mouth, resulting in blocking, there is no valve plug dead, can not open the phenomenon, and the size Large, weight is also large in the spool up and down when the medium is easy to bring out, the sealing performance is poor, the pressure can withstand smaller, when the pressure difference there will be erosion, cavitation phenomenon. The medium flow path of the angular stroke is simple, so the flow resistance is small, the circulation capacity is large, the Kv value is large, and the medium is not easily precipitated. As the flow path is simple, lumen and shape is also simple, smaller size. From all sorts of comparison, the angular stroke is obviously the mainstream of the regulating valve. And in the angle of the valve and then from the common ball valve, butterfly valve and three eccentric butterfly valve to do some comparison. Judge a good or bad valve from its regulation, cut off, pressure, anti-blocking, corrosion resistance, pressure, temperature, weight, appearance and leakage of these considerations. Ball valve weight is too heavy, bulky, ugly appearance; ordinary butterfly valve is difficult to cut off the fluid, and the torque is too large, the only to meet all the above requirements is the three eccentric butterfly valve. This can be clearly seen that the advantages of three eccentric butterfly valve, in the valve industry's position goes without saying. In the "Kyoto Daily" on the scientists predict that by 2030 or so the world's fossil fuels will be depleted. National Development and Reform Commission announced on April 10 "Eleventh Five-year Plan" of energy development proposed to deepen the reform of the system of coal, oil and gas, electricity, renewable energy and other fields to improve the energy price system. This kind of situation shows how much impact the petrochemical industry has on our lives, as well as the urgency of controlling energy, preventing waste and preventing pollution. Valves play an important role in these fields, and from the advantages of the new three-eccentric butterfly valve, the new three-eccentric butterfly valve occupies an important position in the valve industry. At present, China's valve industry manufacturers gradually increase research and development efforts, but outdated product technology, the production of the valve can only meet the market requirements of about 70%, resulting in such a result is because there is no competitive products appear. With the constant development of economy in our country and constant improvement of market economy, the demand of users in the market is getting higher and higher. In the systems of urban construction, environmental protection, natural gas, crude oil, petrochemical and water conservancy, The valve. The emergence of the new "three eccentric valve" to meet their urgent needs, but to make up for this gap, but also to the valve industry, as well as the continuous efforts of various industries, and constantly innovate to develop higher quality products to meet The huge market demand!