Development and Application of Three Eccentric Butterfly Valve
Three Eccentric Butterfly Valve Development
Since the introduction of the three eccentric disc valve, it has continuously evolved to meet increasingly demanding industrial conditions. While achieving zero leakage is theoretically possible with a three eccentric design, in practice, it relies heavily on meticulous engineering and precise manufacturing. Based on the strengths and limitations of existing three-eccentric butterfly valves, Butterfly Valve Co., Ltd. introduced its proprietary Tritec three-disc valve, featuring several advanced characteristics that set it apart.
1. **Compliance with API Standards**
Tritec is designed and manufactured strictly according to the 1997 edition of API609, which has become a global standard for pipeline valves. Beyond this, Tritec's design is flexible enough to align with other major standards such as BS5155, ANSI B16.34, and ASME SEC VIII. This ensures its wide applicability across various industries.
2. **Double Safety Structure**
To prevent issues like disc deformation due to pressure or temperature, stem misalignment, and seat blockage, Tritec is equipped with two independent thrust rings on both sides of the disc. Additionally, it features dual mechanisms to prevent stem damage and potential flying-out accidents. These features allow Tritec to operate safely at pressures up to 2,500 psi.
3. **No Dead Zone Design**
Tritec utilizes the three eccentric sealing principle to eliminate friction between the disc and the seat, ensuring smooth operation without the common "dead zone" issue found in traditional valves. This allows for precise control from near 0% to 90%, offering a 100:1 regulation ratio, making it ideal for critical control applications where accuracy is essential.
4. **Body-Mounted Seat Structure**
Unlike conventional designs, Tritec mounts the seat directly onto the body, reducing direct contact with the process media and minimizing erosion. This significantly extends the service life of the seat and enhances overall reliability.
5. **Laminated Seat Construction**
The seat is made of a stainless steel and graphite laminate, providing resistance against micro-solid impact and thermal expansion. Even minor damages do not result in leaks, a feature unmatched by other three-eccentric or double-eccentric designs.
6. **Replaceable Sealing Surfaces**
Tritec’s sealing system is uniquely designed to allow individual replacement of the disc seal without disassembling the entire valve. This reduces maintenance costs and downtime, making it more cost-effective in the long run.
7. **Balanced Bolted Seal Fixation**
The oval-shaped bolt distribution ensures even force application, preventing uneven stress and potential leakage. This balanced structure enhances the valve’s sealing performance and longevity.
8. **Fire-Resistant Design**
Tritec is inherently fire-safe, meeting API607, API6FA, and BS6755 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 System**
Tritec minimizes external leakage through a high-performance packing system, exceeding EPA21 specifications. Some test results have shown external leakage as low as 7 ppm, making it suitable for use with toxic and corrosive media.
In summary, the three eccentric butterfly valve represents the pinnacle of modern valve technology, overcoming the limitations of traditional valves. Tritec, with its maximum pressure rating of 2,500 psi and standard size up to 48 inches, offers versatility in flange types, connection styles, and material options. It is particularly well-suited for large-diameter applications where zero leakage and precise control are critical. Its growing adoption in key sectors such as oil and gas, petrochemicals, and energy generation highlights its value and reliability.
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