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Development of triple eccentric BUTTERFLY VALVE
Since the advent of triple eccentric Butterfly Valve, in order to meet the increasingly severe requirements of working conditions, it has also experienced the process of self-improvement and continuous development. Even if the most basic zero leakage, in theory, three eccentric butterfly valve can be achieved, but in fact still depends on careful design, precision manufacturing. On the basis of absorbing and summing up the advantages and disadvantages of other brands of triple eccentric butterfly valves, Badi Valve Co., Ltd. has launched its own unique triple eccentric butterfly valve Tritec
Features of triple eccentric butterfly valve
1. API specification
As we all know, API609 has actually become the international specification of valves for industrial important pipelines. Tritec is designed and manufactured in strict accordance with the latest 1997 edition of API609. What's more, the basic design of Tritec is not limited to API, bs5155ansib16.34, asmesecviii and other major specifications can be corresponding, which ensures that Tritec can be used in all industrial fields.
2. Dual security structure
In strict accordance with the specification requirements of API609, in order to prevent the deformation of butterfly plate, the dislocation of valve stem and the occlusion of sealing surface caused by the influence of fluid pressure and temperature, Tritec has installed two independent thrust rings on the upper and lower sides of the butterfly plate to ensure the normal operation of the valve under any working conditions;
At the same time, in order to prevent the sudden accident caused by the valve stem breakage and flying out caused by unknown reasons, the independent stem flying out prevention mechanism is designed at the inside and outside of the lower end of the valve, which ensures that the pressure level of Tritec can reach 2500 pounds.
3. No dead zone design
In the design process, Tritec specially considered the application problems in the field of control, made full use of the sealing principle of triple eccentric butterfly valve, realized that the butterfly plate did not scratch the valve seat when the valve was opened and closed, and the torque of the valve stem was directly transmitted to the sealing surface through the butterfly plate, that is to say, there was almost no friction between the butterfly plate and the valve seat It eliminates the phenomenon that the valve can not be regulated due to various unstable factors such as friction in the low opening range of the valve, that is, the dead zone is removed. This means that Tritec can enter the adjustable area from 0 to 90. Its normal control ratio is more than twice that of the ordinary Butterfly valve, and the maximum regulation ratio can be more than 100:1. This creates a good condition for the use of Tritec as a Control Valve, especially in the case of large diameter, the cost of the stop valve is very high, in addition, the stop valve can not achieve zero leakage, in the case of emergency shutdown, it is necessary to install a shut-off valve on the side of the stop valve, and Tritec integrates control and shut-off, and its economic benefits are extremely considerable
4. Body seat structure
There are two kinds of valve seat installation structures of three eccentric butterfly valves. Most of them are installed on the butterfly plate for drawing convenience. However, Tritec adopts the body seat structure to install the valve seat on the body. Compared with the butterfly valve seat, the valve seat greatly reduces the chance of direct contact with the medium, thus reducing the erosion degree of the valve seat and prolonging the service life of the valve seat.
5. Thin sheet seat structure
The valve seat of Tritec is composed of stainless steel sheet and graphite sheet. This structure can effectively prevent the influence of small solid in the medium and the sealing surface bite caused by thermal expansion. Even if there is slight damage, there will be no leakage, which is unthinkable for double eccentric butterfly valve or other three eccentric butterfly valve.
6. Replaceable sealing pair
The sealing pair of Tritec is unique. Not only the valve seat can be replaced, but also the sealing surface of the butterfly plate can be replaced because the sealing surface of the butterfly plate is independent from the butterfly plate. In other words, when the sealing surface of the butterfly plate is damaged, there is no need to send it back to the factory or decompose the valve in a large scale, and only the sealing surface of the butterfly plate can be replaced. This not only greatly reduces the maintenance cost, but also greatly reduces the maintenance cost The maintenance time, intensity and difficulty of maintenance are reduced.
7. Balanced fixed structure
Based on the shape characteristics of the sealing surface of the triple eccentric butterfly valve, Tritec adopts the oval bolt distribution to fix the sealing pair, which not only makes the positioning accurate, but also makes each bolt bear the force evenly, so as to put an end to the looseness and leakage of the sealing pair caused by the uneven stress distribution.
8. Essential fire resistant construction
Many valves claim to have fire-resistant construction, but most of them adopt hard and soft double seat structure to reduce leakage, which is very dangerous. Because the incomplete combustion of soft seal valve seat in fire will make the metal support valve seat produce stress and temperature difference deformation, which will lead to the failure of fire resistant machine. Therefore, Europe and the United States are gradually eliminating this kind of fire-resistant valve. Because of its zero leakage, tritrc does not need the assistance of soft seal. It is a true fire-resistant structure, and has obtained the fire-resistant inspection certificate of api607, api6fa and bs6755part2. This ensures that Tritec can be used in oil, petrochemical and other dangerous areas. In the conservative UK, almost all the valves used in key parts of its North Sea oil fields are covered by Tritec
9. High packing construction
In terms of valve leakage, traditionally, the leakage of valve seat, i.e. internal leakage, is often focused on, while the leakage of packing part is ignored, that is, external leakage. In fact, in today's society where environmental problems are increasingly valued, it is an indisputable fact that the harm of external leakage is far greater than that of internal leakage. Tritec triple eccentric butterfly valve is a rotary valve, and its stem action is only 90 ° rotation, which is spiral multi rotary reciprocating motion with Gate Valve and stop valve
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