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Since its introduction, the three-eccentric disc valve has continuously evolved to meet increasingly demanding operational conditions. While the concept of zero leakage is theoretically achievable with a three-eccentric design, in practice, it requires meticulous engineering and precision manufacturing. Recognizing the strengths and limitations of existing three-eccentric butterfly valves, Butterfly Valve Co., Ltd. developed its own innovative tri-disc valve, Tritec, featuring advanced design elements that set it apart in the industry.
First, Tritec is fully compliant with the latest API 609 standard from 1997, ensuring high-quality performance. Beyond just API specifications, it can also be tailored to meet other major standards such as BS5155, ANSI B16.34, and ASME SEC VIII, making it suitable for a wide range of industrial applications worldwide.
Second, Tritec incorporates a double safety structure. To prevent disc deformation due to pressure or temperature changes, and to avoid stem misalignment or sealing surface blockage, two independent thrust rings are installed on both sides of the disc. Additionally, a dual mechanism is in place at the bottom of the stem to prevent accidental disengagement, enhancing safety and allowing Tritec to operate at pressures up to 2,500 psi.
Third, Tritec features a no-dead-zone design, which is especially beneficial in control and regulation applications. By leveraging the unique sealing principle of three-eccentric butterfly valves, it minimizes friction between the disc and seat, eliminating common issues like valve jumping during operation. This allows for precise control from near 0% to 90%, offering a turndown ratio of up to 100:1, far surpassing conventional butterfly valves. This makes Tritec an excellent choice for control valves, especially in large-diameter systems where traditional shut-off valves are costly and difficult to maintain.
Fourth, the body-mounted valve seat design of Tritec reduces direct exposure of the seat to the process media, minimizing erosion and extending service life compared to traditional designs.
Fifth, the laminated valve seat—made of stainless steel and graphite—effectively prevents damage caused by solid particles or thermal expansion, ensuring leak-free performance even under harsh conditions.
Sixth, Tritec offers replaceable seals. Both the body seat and the disc’s sealing surface can be replaced independently, reducing downtime and maintenance costs significantly.
Seventh, the balanced bolted seal design ensures uniform stress distribution across the sealing interface, preventing uneven wear and potential leaks.
Lastly, Tritec is designed with a fire-resistant structure. Unlike many valves that rely on soft-seal assistance, which can fail under fire conditions, Tritec achieves true zero leakage without the need for soft seats. It meets stringent fire-resistance standards such as API 607, API 6FA, and BS 6755 Part 2, making it ideal for use in hazardous environments like oil and gas fields. In the UK, Tritec is widely used in critical North Sea operations, often serving as the preferred solution for high-risk applications.