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Five minutes to introduce the three-eccentric butterfly valve

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More than 50 years have passed since the launch of the three-eccentric butterfly valve, which has been developing continuously for more than 50 years. The application of butterfly valves has spread across multiple industries. The original butterfly valve is used only for the truncation of water medium. Triple eccentric design enhance the function of the butterfly valve which has become the industry industrial pipeline equipment and key process conditions under the condition excellent performance of valve.


As the name suggests, three independent offsets are designed to be valves. 

butterfly-valve

Butterfly valve tripartite means:

1) centerline of disc/seat sealing surface,

2) the position of the axis relative to the Central Line of the hole;

3) the axis of seat cone Angle offset from the center line of the valve hole.

The combination of these three offsets provides a tapered sealing surface that minimizes wear between seats and seals, increasing the service life and sealing of the valve. In addition, lower the superior seating surface to small, and reduce the working torque of the valve.


Generally speaking, because of its sealing characteristics and cost is more advantageous than other metal seat valve type selection. Due to its compact structure, rotary design and lightweight structure, it is easy to install and operate. They do not need support. Replaceable seal rings allow quick and easy maintenance and low torque (allowing smaller drives) to mean more cost savings


The two - way zero leakage closed metal seat has only one soft seat valve. This will greatly expand the possibilities of applications. Flexible sealing ring and good torque transmission, which means that these valves can provide fire safety design and sealing performance, which can be larger than the general butterfly valve design. Traditionally, may be found in many industries generating oil and 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 the need for more stringent programmes to force users to seek solutions. Usage has been rising, and for decades, features have provided many good solutions, including those with greater challenges. These benefits include operational efficiency, abrasive media and chemicals to temperature or pressure, and versatility in many operating conditions.

How to further improve the safety and performance of the valve by utilizing the features of the design and the functions provided by the next generation design?

1. Use the precision machined sealing surface and sealing ring to form metal to metal seal. Even in high temperature and high pressure and other harsh service environments, there can be two - way sealing zero leakage. Low friction and flow linear standard rectangular conical design, metal can be a good solution to thermal expansion and contraction, is an important characteristic of high temperature and high pressure environmental services. Metal seals are allowed in oil fields with fire protection requirements.

2. the valve seat sealing surface design, valve seat sealing surface using on the valve body welding department too vertical carbide, use the sealing surface has a longer life expectancy and better wear resistance, even recycled again and again. This seal design reduces friction with the butterfly plate and reduces working torque.

3. Special seat design USES the valve to automatically adjust the seal of the valve. The floating seal ring and a wide seal ring support gasket, which is more reliable with sealing and opening. This seat ensures that the valve has a bidirectional sealing feature.

4. The positioning pin of valve design is very low in the butterfly plate, allowing for good performance during thermal expansion, and greatly reducing the disturbance of the stem. Therefore, the valve has a long service life.