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Features and applications of triple eccentric butterfly valve

Since its introduction, the triple eccentric disc valve has undergone a process of self-improvement and continuous development to meet the increasingly severe operating conditions. Even though the basic zero leakage can be achieved in theory, in practice, it depends on careful design and precision manufacturing. Ltd. has introduced its own unique triple eccentric disc valve, Tritec, with the following characteristics, based on the strengths and weaknesses of other brands of triple eccentric disc valves.

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  1、API specification

  As we all know, API609 has become a de facto international standard for valves used in important industrial pipelines. Tritec is designed and manufactured in strict accordance with the new 1997 version of API609 specification. What's more, Tritec's basic design is not only limited to one API specification, but also BS5155 ANSI B 16.34, ASME SEC VIII and other major specifications, which ensures that Tritec can be used in all industrial fields.

  2、Double safety construction

  Tritec strictly follows the specification of API609, to prevent the deformation of the butterfly plate, the misalignment of the stem, and the galling of the sealing surface caused by the fluid pressure and temperature, two separate thrust rings are installed on the upper and lower side of the butterfly plate, thus ensuring the normal operation of the valve under any working condition.

  At the same time, in order to prevent the sudden accident caused by the stem breaking and flying out for unknown reasons, two independent stem flying out prevention mechanisms are designed at the lower and inner ends of the valve, which also ensures that the pressure level of Tritec can be as high as 2500 lbs.

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  3、No dead zone design

  In the design process, Tritec takes special consideration of the application in the field of regulation and control, making full use of the sealing principle of the triple eccentric butterfly valve, so that the butterfly plate does not scrape the valve seat when the valve is opened and closed, and the torque of the valve stem is transmitted directly to the sealing surface through the butterfly plate, which means that there is almost no friction between the butterfly plate and the valve seat, thus eliminating the jumping phenomenon common to opening ordinary valves and eradicating the low opening range of the valve due to friction. This means that the Tritec can enter the adjustable area from 0 degree opening to 90 degree opening, and its normal control ratio is more than 2 times that of normal butterfly valves, and the control ratio can be as high as 100:1. This creates good conditions for Tritec to be used as a control valve, especially in large diameter, the cost of the shut-off valve is very high, in addition, the shut-off valve can not achieve zero leakage, in the need for emergency shut-off conditions, the shut-off valve must be installed on the side of the shut-off valve, and Tritec set control and shut-off in one, its economic benefits are extremely considerable.

  4、Body seat structure

  There are two types of seat installation for triple eccentric butterfly valves, most of which are installed on the butterfly plate for convenience, but Tritec adopts the body seat construction, and the seat is installed on the body. The advantage is that compared with the butterfly plate seat, the seat greatly reduces the chance of direct contact with the medium, thus reducing the degree of erosion of the seat and extending the service life of the seat.

  5、Thin laminate valve seat structure

  Tritec's valve seat is made of stainless steel laminate and graphite laminate, this structure can effectively prevent the influence of small solids in the medium and the sealing surface galling caused by thermal expansion, even if there is a small damage, there is no leakage, which is unimaginable for double eccentric butterfly valves or other triple eccentric butterfly valves.

  6、Replaceable seal

  Tritec's sealing side is unique, not only the body seat can be replaced, but also the butterfly sealing surface and the butterfly plate are independent, the butterfly sealing surface can also be replaced, that is to say, when the butterfly sealing surface is damaged, there is no need to transport back to the manufacturer or disassemble the valve in a big way, only to replace the butterfly sealing surface, which not only greatly reduces the maintenance cost, but also greatly reduces the maintenance time and overhaul. Strength and difficulty.

  7、Balanced fixed structure

  From the sealing surface shape of the triple eccentric butterfly valve, Tritec adopts the bolt elliptical distribution fixing method, which not only locates accurately, but also makes each bolt suffer from balanced force, and eliminates the loosening and leakage of the sealing sub due to uneven stress distribution.

  8、Essential fire-resistant structure

  Many valves claim to have a fire-resistant structure, but a large part of the valve in order to reduce the amount of leakage and the use of soft and hard double seat structure, in fact, this is very dangerous. Because the incomplete combustion of the soft seal seat during a fire will cause the metal support seat stress, temperature deformation, resulting in the failure of the fire-resistant function. Therefore, Europe and the United States are gradually excluding this type of fire-resistant valves that do not live up to their names. Tritrc has zero leakage, so it does not require soft seal support, and is a true fire-resistant construction, and has been awarded the fire resistance test certificates of API607, API6FA and BS6755Part2. This ensures that Tritec can be used in various hazardous areas such as oil and petrochemicals. In the conservative UK, almost all the valves used in the critical parts of the North Sea oil fields are covered by Tritec, which is a good example. 

     9、High sealing packing structure

  In the valve leakage problem, the traditional tendency is to focus on the leakage of the valve seat, that is, internal leakage, and ignore the leakage of the packing part, that is, external leakage. In fact, in the contemporary society where environmental issues are being paid more and more attention, it has become an indisputable fact that external leakage is far more harmful than internal leakage. Tritec triple eccentric butterfly valve is a retrograde valve, its stem action is only 90 ° rotation, which is compared with the gate valve, globe valve and other stem action is a spiral multi-turn reciprocating motion, the packing part is subject to very low wear, relatively long service life, and because Tritec in the packing seal to prevent external leakage structure, adopted a high standard design, so that in accordance with the EPA21 specifications, the standard leak test, the standard leak test. The standard seal performance is guaranteed to be below 100ppm when tested for external leakage under the EPA21 specification. In fact, Tritec's existing test results have resulted in external leakage values as low as 7 ppm under Lloyd's monitoring. These specifications mean that the Tritec can be used in toxic and hazardous media lines in a variety of applications, including chemical applications.

  Applications of Triple Eccentric Butterfly Valves

  As mentioned above, the triple eccentric butterfly valve, as a result of the new technology of valve, will be more and more valued by the users and designers for its strengths and weaknesses. The Tritec of Butterfly Valve Co., Ltd. has a large pressure rating of 2500 pounds and a standard bore of 48 inches, and it can be used for clamping, lug, flange, ring joint, butt weld, jacket, and various structure lengths, etc. Because of the wide choice of materials for the Tritec, it can be used for high and low temperatures and various corrosive media such as acids and alkalis. Especially in the large diameter, with its zero leakage advantage, it is replacing the bulky gate valve and ball valve in the shut-off valve, and also replacing the bulky globe valve in the control valve with its excellent control function. As a matter of fact, Tritec has been used in various important pipelines such as oil and gas extraction, offshore platforms, oil refining, petrochemicals, inorganic chemicals, energy generation and other major industrial fields including China.