Since its inception, the three-eccentric disc valve has undergone a process of self-improvement and continuous development in order to meet the increasingly severe working conditions. Even the most basic zero leakage, theoretically three eccentric disc valves can be achieved, but in fact depends on careful design and precision manufacturing. Basing Valve Co., Ltd. has introduced its own unique tri-eccentric disc valve Tritec based on the advantages and disadvantages of other brands of three eccentric disc valves. Its characteristics are as follows: 1, API specifications As we all know, API609 has in fact become an international specification for valves used in industrially important pipelines. Tritec is fully designed and manufactured in strict accordance with the latest 1997 edition of the API609 specification. What's more, Tritec's basic design is not limited to API specifications, BS5155 ANSI B 16.34, ASME SEC VIII and other major specifications, which guarantees that Tritec has its place in all industrial fields. 2, double safety structure Tritec strictly follows the specifications of API609, to prevent deformation of the disc caused by fluid pressure and temperature, misalignment of the valve stem, engagement of the sealing surface, and two independent thrust rings on the lower side of the disc. Thereby ensuring the normal operation of the valve under any working conditions; At the same time, in order to prevent the sudden failure of the valve stem caused by the unknown cause, the valve stem fly-out prevention mechanism is designed in the inner and outer parts of the lower end of the valve, which also guarantees the pressure level of Tritec from the side. It can be as high as 2,500 pounds. 3, no dead zone design In the design process, Tritec specially considered the application problems in the regulation field, fully utilized the sealing principle of the triple eccentric butterfly valve, and realized that the butterfly does not scrape the valve seat when the valve is switched, and the torque of the valve stem is directly transmitted to the seal through the butterfly plate. There is almost no friction between the butterfly plate and the valve seat, which eliminates the common jumping phenomenon of opening the ordinary valve, and eliminates the control caused by various unstable factors such as friction in the low opening range of the valve. It can't be a phenomenon, that is, it eliminates the dead zone (not feeling), which means that Tritec can enter the controllable area from 0 degrees to 90 degrees, its normal regulation ratio is more than 2 times that of the general butterfly valve, and the regulation ratio is the highest. Can be as high as 100:1 or more. This creates good conditions for Tritec to be used as a regulating valve, especially at large diameters, where the cost of the shut-off valve is extremely high, and in addition, the shut-off valve cannot achieve zero leakage. In the case of emergency shut-off, the shut-off valve must be The side of the side is equipped with a shut-off valve, and Tritec is a combination of regulation and shutdown, and its economic benefits are extremely impressive. 4, the body seat structure There are two types of valve seat mounting structures for the three eccentric butterfly valves, most of which are mounted on the butterfly plate for convenience, but Tritec uses the body valve seat structure to mount the valve seat on the body. The advantage is that compared with the butterfly seat, the chance of the valve seat directly contacting the medium is greatly reduced, 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 Tritec's seat is made of stainless steel sheet and graphite sheet. This structure can effectively prevent the influence of tiny solids in the medium and the sealing surface of the sealing surface caused by thermal expansion. Even if there is slight damage, it will not leak. This is unimaginable for double eccentric butterfly valves or other three eccentric butterfly valves. 6, replaceable seal pair Tritec's sealing pair is unique, not only can the body seat be replaced, but also because the disc sealing surface is independent of the disc, and the disc sealing surface can be replaced, that is, when the disc sealing surface is damaged, it is no longer necessary. It is only necessary to change the sealing surface of the butterfly plate, which not only greatly reduces the maintenance cost, but also greatly reduces the maintenance man-hour and maintenance intensity and difficulty. 7, balanced fixed structure Starting from the shape characteristics of the sealing surface of the triple eccentric butterfly valve, Tritec's sealing sub-fixing method adopts the bolt-shaped elliptical distribution to fix, not only the positioning is accurate, but also makes each bolt balance the force and eliminates the uneven distribution of stress. The sealing pair is loose and leaks. 8. Essential refractory structure Many valves claim to have a refractory construction, but most of them use a soft and hard double seat construction to reduce leakage, which is dangerous. Incomplete combustion of the soft-seal seat during a fire can cause stress and temperature differential deformation of the metal-supporting valve seat, resulting in failure of the fire-resistant function. Therefore, at present, Europe and the United States are gradually eliminating such a nameless fire-resistant valve. Tritrc is a zero-leakage, so it does not require a soft seal, a veritable nature of the refractory structure, and has a certificate of fire resistance approval for API607, API6FA and BS6755Part2. This ensures that Tritec can be used in various hazardous areas such as petroleum and petrochemicals. The valves used in the key parts of the conservative UK and its North Sea oil fields are almost always best illustrated by Tritec. In the leakage problem of the valve, it is conventionally concentrated on the leakage of the valve seat, that is, the internal leakage, and the leakage of the filler portion, that is, the external leakage is neglected. In fact, in today's contemporary society where environmental issues are increasingly valued, the danger of external leakage is far greater than the internal leakage has become an indisputable fact. Tritec triple eccentric butterfly valve is a rotary valve, and its valve stem action is only 90 ° rotation. Compared with the valve stem, stop valve and other valve stems, it has a low degree of wear and is relatively low. The service life of the ground is very long, and Tritec has adopted the highest standard design in the structure of preventing external leakage such as packing seals, so that when the external leakage test is performed according to EPA21 specifications, the standard sealing performance is guaranteed to be less than 100 ppm. In fact, in the existing Tritec test results, in the case of Lloyd's monitoring, the external leakage value was as low as 7ppm. These indicators mean that Tritec can play a role in the toxic and hazardous media pipelines in various fields such as chemical industry. Application of triple eccentric butterfly valve In summary, the three eccentric butterfly valves, as the crystallization of the latest technology of valves, the length of various valves, and the shortness of avoiding various valves, will surely receive more and more attention from users and designers. Tritec of Barbary Valves Co., Ltd. has a maximum pressure rating of 2,500 lbs, a standard caliber of 48 inches, and a pair of clips, lugs, flanges, rings, butt welds, jackets, various structural lengths, etc. Correspondingly, Tritec's material selection is large, high and low temperature, and corrosive media such as various acids and alkalis can also be used. Especially in terms of large diameter, with its zero leakage advantage, on the shut-off valve, it is constantly replacing the large gate valve and ball valve. Similarly, with its excellent regulation function, on the control valve, it is constantly replacing the bulky Globe valve. As a matter of fact, Tritec has been used in various important pipelines such as oil and gas exploration, offshore platforms, petroleum refining, petrochemicals, inorganic chemicals, energy generation and other industrial fields including China.
9, high sealing filler structure