The development of triple eccentric butterfly valve
Since its inception, the triple eccentric butterfly valve has undergone a process of self-improvement and continuous development in order to meet increasingly severe working conditions. Even if the most basic zero leakage and triple eccentric butterfly valve can be achieved in theory, it still depends on careful design and precise manufacturing. On the basis of absorbing and summarizing the strengths and weaknesses of other brands of triple eccentric butterfly valves, Badie Valve Co., Ltd. launched its own unique triple eccentric butterfly valve tritec
Features of triple eccentric butterfly valve
1. API specifications
As we all know, api609 has in fact become the international standard for valves used in important industrial pipelines. Tritec is designed and manufactured in strict accordance with the latest 1997 version of api609 specifications. What’s more valuable is that the basic design of tritec is not limited to api specification, bs5155ansib16.34, asmesecviii and other major specifications can be corresponded, which ensures that tritec is useful in all industrial fields.
2. Double safety structure
Tritec strictly follows the specifications of api609, in order to prevent the deformation of the butterfly plate caused by the influence of fluid pressure and temperature, the dislocation of the valve stem, the sealing surface occlusion, and two independent thrust rings are installed on the upper and lower sides of the butterfly plate. So as to ensure the normal operation of the valve under any working conditions;
At the same time, in order to prevent unexpected accidents caused by valve stem damage and flying out caused by unknown reasons, independent valve stem flying out prevention mechanisms are designed at the lower end of the valve, which also guarantees the pressure level of tritec from the side. It can be as high as 2500 pounds.
3. No dead zone design
In the design process, tritec specially considered the application problems in the field of control and made full use of the sealing principle of the triple eccentric butterfly valve, so that the butterfly plate does not scratch the valve seat when the valve is opened, and the torque of the valve stem is directly transmitted to the seal through the butterfly plate. In other words, there is almost no friction between the butterfly plate and the valve seat, which eliminates the common jumping phenomenon that is common when opening ordinary valves, and eliminates the control caused by various unstable factors such as friction in the low opening range of the valve. No phenomenon, that is, the dead zone (non-sensing zone) is eliminated, which means that the tritec can almost enter the adjustable area from 0 opening to 90 opening, its normal control ratio is more than twice that of ordinary butterfly valves, and the control ratio is the highest It can be as high as 100:1 or more. This creates good conditions for tritec to be used as a control valve, especially when the diameter is large, the cost of the shut-off valve is extremely high, in addition, the shut-off valve cannot achieve zero leakage, and it must be used in the working conditions that require emergency shutdown. A shut-off valve is installed on the side of the tritec, and the tritec integrates control and shut-off, and its economic benefits are extremely considerable
4. Body valve seat structure
There are two valve seat installation structures for triple eccentric butterfly valves. Most of them are installed on the butterfly plate for the convenience of the drawing, but the tritec adopts the body seat structure and installs the valve seat on the body. Its advantage is that compared with the butterfly valve seat, it greatly reduces the chance of the valve seat directly contacting the medium, thereby reducing the degree of erosion of the valve seat and prolonging the service life of the valve seat.
5. Thin layer valve seat structure
The valve seat of tritec is laminated by stainless steel flakes and graphite flakes. This structure can effectively prevent the influence of small solids in the medium and the sealing surface occlusion caused by thermal expansion. Even if there is a small damage, there will be no leakage. , And this is unimaginable for double eccentric butterfly valves or other triple eccentric butterfly valves.
6. Replaceable sealing pair
Tritec’s sealing pair is unique. Not only the body valve seat can be replaced, but also because the butterfly plate sealing surface and the butterfly plate are independent, the butterfly plate sealing surface can also be replaced, that is to say, when the butterfly plate sealing surface is damaged, there is no need to Xingshi mobilizes to transport it back to the manufacturing plant or disassemble the valve on a large scale, and only need to change the sealing surface of the butterfly plate. This not only greatly reduces the maintenance cost, but also greatly reduces the maintenance man-hours and the intensity and difficulty of the maintenance.
7. Balanced fixed structure
Starting from the characteristics of the sealing surface shape of the triple eccentric butterfly valve, the sealing pair of tritec adopts the elliptical distribution of bolts to fix, not only the positioning is accurate, but also the force of each bolt is balanced, eliminating the uneven distribution of stress. The sealing pair is loose and leaking.
8. Intrinsic refractory structure
Many valves claim to have a fire-resistant structure, but most of them use a soft and hard double seat structure to reduce leakage. In fact, this is very dangerous. Because the incomplete combustion of the soft-seal valve seat during a fire will cause the metal supporting valve seat to produce stress and temperature difference deformation, which will lead to the failure of the refractory function. Therefore, Europe and the United States are gradually excluding this type of refractory valve that does not deserve its name. Because tritrc has zero leakage, it does not require the help of a soft seal. It is a veritable essential fire-resistant structure and has obtained the fire-resistant inspection certificate of api607, api6fa and bs6755part2. This ensures that tritec can be used in various hazardous areas such as petroleum and petrochemicals. The best example is that the valves used in various key parts of the conservative UK and North Sea oil fields are almost completely covered by tritec.
9. High sealing packing structure
In terms of valve leakage, traditionally, the leakage of the valve seat, that is, internal leakage, is often concentrated, while the leakage of the packing part, that is, external leakage is ignored. In fact, it is an indisputable fact that in the contemporary society where environmental issues are increasingly valued, leakage is far more harmful than internal leakage. The tritec triple eccentric butterfly valve is a rotary valve, and its stem action is only 90° rotation. This is compared with the valve stem action of gate valves, globe valves, etc., which is spiral multi-turn reciprocating motion, and the degree of wear on its packing part is very low. The service life of the ground is very long, and because Tritec has adopted the highest standard design in the packing seal and other external leakage prevention structures, the standard sealing performance can be guaranteed to be below 100ppm when the external leakage test is performed in accordance with the epa21 specification. In fact, in the existing test results of Tritec, under Lloyd’s monitoring, the external leakage value is as low as 7ppm. These indicators all mean that Tritec can show its skills in toxic and hazardous media pipelines in various fields such as chemical industry.
Three eccentric butterfly valve application
In summary, as the crystallization of the latest valve technology, the triple eccentric butterfly valve, which takes advantage of the advantages of various valves and avoids the shortcomings of various valves, will surely attract more and more attention from users and designers. The tritec of Badie Valve Co., Ltd. has a maximum pressure rating of 2500 pounds, a standard caliber of 48 inches, butt clamps, lugs, flanges, ring joints, butt welding, jackets, various structural lengths, etc. It can be used for all kinds of materials, and because of the large selection of materials of Tritec, high and low temperature, various acids, alkalis and other corrosive media can also be handled freely. Especially in terms of large diameter, with its zero leakage advantage, in the shut-off valve, it is constantly replacing the large gate valve and ball valve. Similarly, with its excellent control function, it is also constantly replacing the bulky control valve. Shut-off valve. As a fact, so far, tritec has been used in various important pipelines including China’s oil and gas extraction, offshore platforms, petroleum refining, petrochemicals, inorganic chemicals, energy power generation and other major industrial fields such as process control.