On the one hand is the increasing scarcity of fossil fuel energy sources, on the one hand the people on oil demand continues to increase, while constantly looking for new energy sources, it is more important is the rational application of existing energy sources and control.
Leakage, sealing problems in the energy production,transportation, use of the most difficult thing, global warming, environmental degradation is the culprit. New butterfly valve is in the sound of the partial needs of pregnant and health, the environment in a variety of channels it can play the role of regulating off.
Let us start with the “three eccentric butterfly valve principle Let’s start with the structure of the butterfly valve on the valve and pipeline connected to the horizontal (ie the valve size), the valve within the valve port plate, the axis perpendicular to the valve port wear in the body and the valve plate. The edge of the disc set outside the sphere, in the valve port is set to meet with the spherical sealing surface, the spherical sealing surface and form a seal with the seal line between the axis of the shaft eccentricity a, the valve plate in the horizontal center line center line of the valve port and shaft eccentricity between the center line b, the outer spherical connection with the valve port of the centerline of the angle between α, which is the principle of the three eccentric butterfly valve .
The ingenious patented product that the “butterfly valve” of the three eccentric valve plate are placed in the outer edge of the disc using some of the spherical structure. This structure is designed to be simple to use CNC machine tool fixture in the completion of the eccentric spherical polished to roughness Ra0.4, Secretary spherical chrome or heap too Levin alloy, hardness HRC45 ~ 60.
The eccentric angle on the valve plate, valve seat ring with the pressure on the pressure in the body, this would resolve the processing problems of ordinary butterfly valve, valve, valve plate, valve seat can not interchangeable with matching, damage repair costs after the high range of issues, and all parts modular, simple warehouse management, processing, easy maintenance, lower spare parts cost.
Butterfly structure principle for production of large diameter valves, cut off the oil pipeline, metallurgy steel, regulation of gas pipeline, cutting, chemical refining, catalytic, cracking, propylene, polyethylene, polypropylene and other devices off the media regulation , into the water treatment equipment, water conditioning off, the thermal power station cooling water system, natural gas, lye, water, acid, etc. are widely used.
Extend the valve cover, valve seat with PTFE, is mainly used in liquid air, liquid oxygen, nitrogen and other -183 ~-196oС ultra-low temperature applications.
Butterfly simple structure, small size, light weight, only by a few parts. And just rotate 1.5o quickly open and close, easy to operate, while the fluid control valve has a good feature.
Butterfly in the fully open position, the disc thickness is only when the medium flows through the body resistance through the valve pressure drop generated by 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 to the axis of the driving torque generated. M-elastic seat coupled with the flexibility of compensation, both to achieve controlled pressure can also enable the comparison of three eccentric butterfly valve sealing performance is improved, life is also greatly improved.
We all know the valve closure element by the movement can be divided into straight and angular travel itinerary. Linear actuator valve closure element (valve, valve plates, etc.) in the fluid channel in a straight line; rotary valve closure element in the fluid channel is doing rotation.
Linear actuator valve manifold of media complex was S-shaped, and thus flow resistance, flow capacity is small, so the flow coefficient Kv value of small, complex circuit straight trip to the media easily settle in the vicinity of the orifice, resulting in lay a trap, there valve related death, and not open phenomenon, and the larger size and weight is also large. Up and down movement in the spool out of easy to medium, sealing performance is poor, can afford less pressure, 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. The flow path is simple, too simple cavity and shape, size is also smaller. From these comparisons, since the rotary valve is clearly mainstream.
In the rotary valve in then from the commonly used ball, butterfly and butterfly valve to do some comparison.
Determine a good or bad valve adjustment from it, cut off, pressure, blockades, corrosion, pressure, temperature, weight, appearance, and leakage of these considerations.
Ball weight is too heavy, bulky, ugly appearance; common butterfly is difficult to cut off the flow, and the torque is too large, the only requirement is to meet all of the above three eccentric butterfly valves. This obviously shows the advantages of the three eccentric butterfly valve in the valve industry in terms of status is not made.
“Kyoto Daily” 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, natural gas, electricity, renewable energy and other areas of structural reform, improve the energy price system. These are not all that the petrochemical industry has brought to our lives how much influence and control of energy, prevent waste, prevent pollution of urgency.
At these areas plays an important role in the valve, butterfly valve from the new point of view all the advantages of the new butterfly valve in the valve industry and occupies important position.
At present, China valve industry, manufacturers have gradually increased research and development efforts, but outdated product technology and production requirements of the valve can only meet about 70% of the market, resulting in this outcome is because there is no competitive products appear.