Three eccentric butterfly valve development, characteristics
development
Three eccentric butterfly valve since its inception, in order to meet the increasingly harsh conditions demand, which itself is undergoing a self-improvement and continuous development process. Even the most basic zero leakage, in theory, three eccentric butterfly valve can be done, but in fact depends on careful design, precision manufacturing. Tomoe Valve Co., Ltd introduces its own unique three eccentric butterfly valve-- tritec based on drawing, summarizing other brands three eccentric butterfly valves and weaknesses.
features
1.api specification
As we all know, api609 have become the international specifications of the valve in industrial important pipelines in fact. The tritec is designed and manufactured full strict in accordance with api609 specifications of the latest 1997 edition. Even more valuable is that, the basic design of tritec is not limited to api specification, bs5155ansib16.34, asmesecviii and others can also correspond, which guarantees tritec can be used in all industrial fields.
2.Double Safety Construction
tritec strictly in accordance with the api609specifications in order to prevent causing butterfly plate deformation, stem dislocation, sealing surface bite due to fluid pressure, temperature effects, respectively installing two separte thrust ring on the up and down disc, to ensure the valve normal operating in any conditions;
At the same time, in order to prevent unknown reasons caused by stem breakage, fly out to cause unexpected incidents, in the inside and outside part of the bottom of the valve, we design separate stem to prevent flying devices, which also guarantees from the side that the tritec pressure level can up to 2500 lbs.
3.No dead-zone design
tritec in the design process, special considering the applicable problems in regulating field, make full use of three eccentric butterfly valve sealing principle, so that when open and close the butterfly valve, plates are not scratch the seat, stem torque directly transfer to the sealing surface through the butterfly plate, which means butterfly plate and the valve seat almost no friction phenomenon, so as to prevent opening the general valve is the common jump phenomenon, to eradicate within the valve low opening range due to friction and other unstable factors causes the unable regulating and controlling phenomenon, namely, the eradication of the dead zone (without a sense of zone), which means that tritec almost can enter into the adjustable region from 0 opening to 90 degrees, its normal regulating and controlling ratio is 2 times more than the general butterfly valve, the maximum control rate can up to above 100:1. This makes good conditions for tritec as a control valve, especially in the large diameter, the cut-off valve cost is too high. In addition, globe valve can not achieve zero leakage, in need of emergency shutdown of the operating conditions, the globe valve must be flanking installed cut-off valve, while the tritec set regulation and cut off in one, and its cost-effectiveness is extremely significant
4、body seat structure
Seat installing structure of three eccentric butterfly valve are two, mostly are pictures for convenience and installed on the disc, but tritec adopts the body seat structure, install the seat on the body. Its advantage is greatly reducing the opportunity of seat connects medium directly, compared with the disc seat, , thereby reducing the extent of seat erosion, extending seat service life.
5、thin film seat structure
tritec seat is made by stainless steel sheets and graphite thin films, this structure can effectively prevent the impact of media tiny solids and thermal expansion may cause the sealing surface occlude, even if there is minor damage, it does not leak, which is inconceivable to the double-eccentric butterfly valve, or other three eccentric butterfly valve.
6、replaceable sealing
tritec sealing can be described as unique, not only the seat can be replaced, and because the butterfly plate sealing surface and the butterfly plate are independent, butterfly plate sealing surface can also be replaced, that is when the butterfly plate sealing surface is damaged, no longer shipped back to factory or break down the valve, simply transposing butterfly plate sealing surface, it will not only greatly reduces maintenance costs, but also greatly reduces maintenance time and maintenance strength and difficulty.
7、balance fixed structure
From three eccentric butterfly valve sealing surface shape characteristics, tritec sealing fixed methods use bolt oval distributed fixation, not only positioning accuracy, but also makes each bolt bear force uniformly, to avoid due to the stress uneven distribution casuing the sealing loosing, leakage.
8、fire-resistant construction
Many valves claim to have a fire-resistant construction, but most of the valves use soft and hard double seat structure in order to reduce leakage, in fact it is very dangerous. Because of soft sealing seat incomplete combustion will make the metal support seat produce stress when in fire, temperature deformation, resulting in failure of fire-resistant function. Thus, at present europe and united states is gradually excluding such unworthy of their name fire-resistant valves. tritrc because its zero leakage, so with no soft-sealed help, is truly the essence of fire-resistant construction, and obtains api607, api6fa and bs6755part2 fire-resistant inspecting qualified certificate. This ensures that tritec can be used in petroleum, petrochemical and other hazardous areas. In conservative Britain, the valves used in various key parts of its north sea oil fields, are almost been included by tritec that is the best example.
9、high sealing packing structure
About the valve leak problem, traditionally tend to focus on the valve seat leakage, that is, internal leakage, while ignoring packing part leakage, that is out leakage. In fact, in the current environment issues are growing in importance in contemporary society, the external leakage is much larger than internal leakage has become an indisputable fact. tritec three eccentric butterfly valve is a rotary valve, its stem is only 90 ° rotary movement, which compared with gate valve, globe valve stem movement as back and forth spiral multi-rotary movement, its packing part suffers low wear and tear, and with relatively long service life, but also because tritec adopts the highest design standard in the packing sealing and other sealings to prevent external leakage structures, which can be carried out in accordance with specifications epa21 external leak test, the standard sealing performance guarantee below 100ppm. In fact, in the existing tritec test scores, in the case of Lloyd's monitoring, the external leakage values is as low as 7ppm. These indicators are meant tritec can play an important role in the field of chemical and other toxic and harmful media pipelines.
Application of three eccentric butterfly valve
In summary, the three eccentric butterfly valve, as the crystallization of the latest technology, using various valve advantages, avoid various valves weaknesses, will be more and more paid attention to by the majority of users and designers. Tomoe Valve Co., Ltd tritec, its maximum pressure level can reach 2500 pounds level, the standard diameter can be done as 48-inch, but also suitable for wafer, lug, flange, ring connection, butt welding, jacket, various structural length. More because of large selection of materials of tritec, high and low temperature and various acids, alkalis and other corrosive media are also able to correspond freely. Particularly in the large-diameter area, with its advantage of zero leakage, in the cut-off valves, they are constantly replacing large gate valve and butterfly Valve, with the same, using its excellent regulatory function, the control valves are also being constantly replace the globe valve. As a fact, so far, tritec has been used, including China, oil and gas exploration, offshore platforms, oil refining, petrochemicals, inorganic chemicals, energy, power generation and other major industrial areas of process control and other important pipeline.
