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| Butterfly valve applications in the petrochemical industry |
| Butterfly valve applications in the petrochemical industry |
The one hand, the increasing scarcity of fossil fuel energy, on the one hand people the increasing demand for fossil energy, in constant search for new energy sources, while the present is more important is the rational application of existing energy resources and control. Leakage, sealing problems in the energy production, transportation, use of the most troublesome things, global warming, environmental degradation is the culprit. New butterfly valve is in the partial sound bred as a demand, it can play a variety of environmental regulation to cut off the pipeline effect.
Let the "three eccentric butterfly valve principle Let's start with the structure of the butterfly's body there are connected with horizontal pipe valve (ie the diameter of valve), valve port within the valve plate, axis perpendicular to the valve port through the body and the valve plate. The valve plate edge set outside the sphere, the valve port is set to meet with the spherical sealing surface, spherical surface and seal with the seal when the seal formed between the axis line and the axis has eccentricity a, valve plate in the horizontal center line center line of the valve port and the shaft are eccentric distance between the center line b, outside the sphere of the connection between the center line with the valve port with angle α, which is the principle of the three eccentric butterfly valve .
The ingenious patented product that the "butterfly valve" are placed on the three eccentric valve plate, valve plate at the outer edge of using some of the spherical structure. Need to use this structure to design a simple fixture to complete the CNC machine tools, the eccentric spherical surface roughness by polishing up Ra0.4, Secretary spherical chrome or heap too Lai alloy, hardness of HRC45 ~ 60.
The eccentric angle on the valve plate, valve seat ring with pressure pressure on the body, this would resolve the processing problems of ordinary three-eccentric butterfly valve, valve, valve plates, valve seat can not interchangeable pair use, damage repair costs after the high range of issues, and all components modular and simple warehouse management, processing, easy maintenance, lower spare parts cost.
Butterfly valve structure principle for production of large diameter valves, cut off the oil pipeline, steel metallurgy, gas channels and regulation, cut, chemical refining, catalytic, cracking, propylene, polyethylene, polypropylene and other devices to cut off media regulation , into the water treatment equipment, water conditioning off, the thermal power station cooling water system, natural gas, lye, water, acid and other industries to be widely applied. To extend the valve cover, valve seat with PCTFE / Kel-f, is mainly used for liquid air, liquid oxygen, nitrogen and other -183 ~-196oС of ultra-low temperature situations. Butterfly simple structure, small size, light weight, only by a few parts. And just rotate 1.5o to quickly open and close, easy operation, while the fluid control valve has good features. Butterfly valve is fully open position, the disc thickness is only when the medium flows through the body resistance, thus generated by the valve pressure drop is small, it has a better flow control characteristics. Butterfly valve is closed, its spherical valve plate and valve seat sealing surface than the pressure applied on the shaft by the torque generated. M-elastic seat coupled with the flexibility of compensation, both realize they can control contrast pressure butterfly valve sealing performance is improved, life is also greatly improved.
We all know the valve closure element according to the movement can be divided into straight and angular travel itinerary. Linear actuator valve is a closure device (valve, valve plates, etc.) in the fluid channel in a straight line; rotary valve closure element is made in the fluid channel in rotation. Linear actuator valve manifold complex media, was S-shaped, and thus a large flow resistance, flow capacity is small, so the value of flow coefficient Kv small, complex circuit straight trips to medium easily settle in the vicinity of the orifice, resulting in trap, there spool off dead, could not open the phenomenon, and the larger size and weight are great. Up and down movement in the spool out of easy to medium, poor sealing performance, can bear the pressure less, when the pressure will be high erosion, cavitation phenomenon. The angle of travel of the media flow path is simple, and thus flow resistance, flow capacity, Kv value, which is difficult to make medium precipitation. As the flow path is simple, too simple cavity and the shape, size is also smaller. From the various comparisons, rotary control valve is clearly beyond the mainstream.
The journey of the valves in the corner and from common ball valve, butterfly and butterfly valve to do some more. Determine a good or bad valve adjustment from its cut off, pressure and blockades, corrosion, pressure, temperature, weight, appearance, and leakage of these considerations. Ball weight too heavy, bulky, ugly appearance; common butterfly is difficult to cut off the fluid, and the torque is too large, the only requirement is to satisfy all of the above three eccentric butterfly valve. This is very clear you can see the advantages of the three eccentric butterfly valve, the valve industry in terms of status words.
"Kyoto Journal," Scientists predict that by around 2030 the world's fossil fuels will be exhausted. National Development and Reform Commission announced on April 10 "energy development" Eleventh Five-Year "Plan" proposed to deepen the coal, oil and gas, electricity, renewable energy and other areas of structural reform, improve the energy price system. These are not all the shows the petrochemical industry to bring our lives how much influence and control of energy, avoid waste, prevent pollution of urgency. Valves in the various areas play an important role in the new butterfly valve from all the advantages of view, the new butterfly valve in the valve industry has an important position.
At present, China valve industry, manufacturers have gradually increased the research and development efforts, but outdated product technology and production to meet market demand valve only about 70%, resulting in this outcome is because there is no competitive products appear. As China's economy continues to develop, market economy continues to improve, users demand more and more of the market in the urban construction Ji Tong, Huan Bao systems, natural gas systems, crude oil, petrochemicals, water and so the systems to be developed in Du a high-quality trial valve. The new "three eccentric valve" appearance, to meet their urgent needs, but to complete the make up the shortfall is also dependent on the valve industry, as well as the industry's continuous efforts and constant innovation, to develop higher quality products to meet the huge market demand!
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ICP: 06003029