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Butterfly valve, why take the three eccentric butterfly valve?

Category:Industry News Publish:2017/7/27 10:53:35 Browse:496 [Back]
Since the three eccentric butterfly valve has been published for more than 50 years, and this 50 years is also in constant development, the use of butterfly valve across a number of industries. The original butterfly valve used only to cut off the water medium and China Unicom, the three eccentric butterfly valve design enhancement function, has become the industry pipeline equipment, key technology of environment under the most severe conditions of high performance valve.

As the name suggests, three separate offsets are designed for valves. Butterfly valve three eccentric refers to:

1) the center line of the sealing surface of the disc / seat,

2) the position of the axis relative to the center of the hole;

3) the axis of the cone angle of the seat offset from the centerline of the valve hole.

The combination of these three offsets provides a conical sealing surface that maximizes wear and tear between the seat and seal and improves service life and tightness of the valve. In addition, the best seat surface is reduced to the minimum, reducing the working torque of the valve.

Generally speaking, due to its sealing characteristics and cost than other metal seat valve type selection is more advantageous. Because of their compact structure, rotary design and lightweight structures can be installed and operated with ease and they do not require pipe support. Replaceable seal rings allow fast and easy maintenance and low torque (allowing smaller drives) means more cost savings.

Two way zero leakage enclosed metal seat with only one soft seated valve. This will greatly expand the possibility of application. Flexible sealing ring and optimum torque transmission, which means that these valves provide fire safety design and sealing performance, which can be greater than the maximum temperature range of the general butterfly valve design. Traditionally, may be found in many industries of oil and natural gas processing, oil refining, chemical and petrochemical plants, power generation, offshore platforms, heating, papermaking, steel Mills, sugar Mills, seawater desalination, water treatment and distribution. Their use in all industries has increased stringent government regulations and larger production requirements, forcing users to seek solutions. The amount has also been rising and has been around for decades, and features provide many good solutions, including those with greater challenges. These benefits include operational efficiency, wear resistant materials, media and chemicals to certain temperatures or pressures, and the versatile nature of the numerous operating conditions.

Utilizing the characteristics of the design, the next generation design provides the capabilities to further improve valve safety and performance, including:

1, the use of precision machined sealing surface and sealing ring to form metal to metal seal. Even in high temperature, high pressure and other harsh service environment, two-way sealing and zero leakage can be achieved. Low friction and streamline standard standard right angle cone design, metal to metal can be a good solution to thermal expansion and cold contraction, is in high temperature and pressure environment services important features. Metal to metal seals allow for use in fields requiring fire protection.

2, the optimal design of the sealing surface of the valve seat, valve seat sealing surface surfacing stellite alloy in the valve body, the wear resistance of the use of sealing surface has a longer life and better, even if used repeatedly. The design of the sealing structure reduces the friction between the butterfly plate and the butterfly plate and reduces the working torque.

3, special seat design, the use of valves can automatically adjust the valve seal. Floating sealing rings and a wide seal ring support gaskets, sealing and opening and closing more reliable. The seat ensures the bidirectional sealing characteristics of the valve.

4, the design of the valve pin located in the very low position of the butterfly board, allowing thermal expansion in the good performance, to minimize the degree of interference of the stem. Therefore, the valve has a long service life.

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