Development and Application of Three Eccentric Butterfly Valve
Three Eccentric Butterfly Valve Development
Since its introduction, the three eccentric disc valve has continuously evolved to meet increasingly demanding industrial conditions. While zero leakage is theoretically achievable in a three eccentric design, practical success depends on meticulous engineering and precision manufacturing. Based on an in-depth analysis of existing three-eccentric butterfly valves, Butterfly Valve Co., Ltd. developed its proprietary Tritec tri-disc valve, featuring advanced design and performance enhancements.
1. **Compliance with API 609 Standards**
Tritec is fully designed and manufactured according to the latest 1997 version of API 609, one of the most widely recognized international standards for butterfly valves. Beyond this, it is compatible with other major specifications such as BS5155, ANSI B16.34, and ASME SEC VIII. This versatility ensures that Tritec can be used across a wide range of industries, from oil and gas to chemical processing.
2. **Dual Safety Structure**
To prevent disc deformation due to pressure or temperature changes, stem misalignment, or sealing surface issues, Tritec features two independent thrust rings on both the top and bottom of the disc. Additionally, it includes dual mechanisms at the stem’s lower end to prevent stem failure or ejection. These safety measures allow Tritec to operate reliably under high-pressure conditions, reaching up to 2,500 pounds.
3. **No Dead Zone Design**
Tritec’s unique three-eccentric sealing principle minimizes friction between the disc and the seat, ensuring smooth operation throughout the entire 90-degree rotation. Unlike conventional butterfly valves, which often suffer from dead zones or unstable control, Tritec offers precise regulation with a ratio of up to 100:1. This makes it ideal for use as a control valve, especially in large-diameter applications where traditional shut-off valves are costly and inefficient.
4. **Integrated Body Valve Seat Structure**
Unlike many other designs, Tritec mounts the valve seat directly onto the body rather than the disc. This reduces direct contact with the media, minimizing erosion and extending the life of the sealing components.
5. **Laminated Valve Seat Construction**
The valve seat is made of a stainless steel and graphite laminate, providing resistance against micro-solid impact and thermal expansion. Even minor damage does not lead to leakage, offering superior performance compared to double or standard three-eccentric valves.
6. **Replaceable Sealing Surfaces**
Tritec’s sealing system is uniquely designed to allow individual replacement of the disc’s sealing surface without requiring full disassembly. This significantly reduces maintenance costs and downtime, making it more cost-effective over the long term.
7. **Balanced Structural Design**
The seal is fixed using evenly distributed bolts, ensuring balanced force distribution and eliminating stress-related leaks. This contributes to the valve’s long-term reliability and tightness.
8. **Fire-Resistant Construction**
Tritec is inherently fire-resistant, meeting API 607, API 6FA, and BS 6755 Part 2 standards. Unlike many valves that rely on soft seals, Tritec achieves zero leakage without them, making it safe and reliable in hazardous environments such as oil and gas fields.
9. **Advanced Packing Seal Design**
While internal leakage is often the focus, external leakage is equally, if not more, critical in today’s environmentally conscious world. Tritec’s rotating design minimizes packing wear, and its high-performance seals ensure external leakage levels as low as 7 ppm, far exceeding industry standards.
**Applications and Advantages**
Tritec is widely used in critical pipelines, including oil and gas exploration, offshore platforms, refining, petrochemicals, and energy generation. With a maximum pressure rating of 2,500 psi and a standard size up to 48 inches, it supports various connection types—flange, lug, wafer, and butt weld. Its ability to handle extreme temperatures and corrosive media makes it a preferred choice in challenging environments.
In summary, the Tritec three-eccentric butterfly valve represents the pinnacle of modern valve technology, combining reliability, precision, and versatility. As industries continue to demand higher performance and tighter control, Tritec is setting new benchmarks in the valve market.
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