Concentric VS Eccentric Butterfly Valve

Concentric VS Eccentric Butterfly Valve

    Concentric & eccentric butterfly valves are quite popular in the valve industry. A Butterfly Valve can be concentric or eccentric is decided by the position of valve shaft. Concentric & eccentric butterfly valves have distinct features that set them apart. There are many Concentric & eccentric butterfly valves manufacturers in the world. Let’s look the difference between Concentric butterfly valves and eccentric butterfly valves.

Design and Structure

    Concentric butterfly valves have a disc that is positioned at the center of the valve body. The shaft passing through the disc is also centered within the flow path. This symmetrical design provides a straightforward and simple construction. In contrast, eccentric butterfly valves feature an offset disc. The shaft is not in the center of the flow passage, which leads to an asymmetrical layout.

Flow Characteristics

    For concentric butterfly valves, in ideal conditions with clean fluids, they can offer relatively stable flow control. The symmetrical nature of the valve when open allows for a consistent flow pattern. However, in applications with fluids containing solid particles or slurries, concentric valves may encounter issues. The centered disc can cause the particles to accumulate around the edges, affecting the valve's performance.

    Eccentric butterfly valves have an advantage in handling dirty fluids. When the valve is in the process of closing, the offset design enables the disc to push the debris towards the center and out of the way. This self - cleaning action during operation helps to maintain better flow control even in the presence of solid matter.

Sealing Performance

    Concentric Butterfly Valves can achieve good sealing when the disc and the seat are properly matched and the valve is in the closed position. The symmetrical design ensures even pressure distribution around the disc - seat interface in clean fluid applications. Eccentric Butterfly Valves, with their unique design, can also provide reliable sealing. The offset closing mechanism can help to enhance the sealing effect by compensating for any potential misalignment caused by factors like pipe stress or thermal expansion.

Operational Torque

    Concentric butterfly valves usually require a certain amount of torque to open and close. In some cases, due to the symmetrical design and potential for particle build - up, the torque may increase over time if not properly maintained. Eccentric Butterfly Valves, on the other hand, often have a lower operational torque requirement. The offset design allows for a more efficient transfer of force during operation, reducing the load on the actuator.

Why choose Concentric & Eccentric Butterfly Valves from Tianjin Worlds Valve Co.,Ltd.    

    Tianjin Worlds Valve Co.,Ltd is leading China Butterfly Valve Manufacturers, We carry only the best parts sourced from world-class butterfly valve manufacturers. And we will provide you with the Relentless Innovation, Uncompromising Quality, and unbeatable service.

    We not only produce exceptional existing products but also undertake bespoke design and manufacturing to meet individualized requirements. Our commitment to excellence is evident in our adherence to advanced management systems and certifications, including ISO 9001, CE, UKCA, WRAS,ACS and more.

Product Features：

1. Small in size and light in weight. Easy installation & maintenance. It can be mounted where needed.

2. Simple & compact construction, quick 90 degrees on-off operation.

3. Minimized operating torque, energy saving.

4. Bubbles-tight sealing with no leakage under the pressure testing.

5. Wide selection of materials, applicable for various medium.

6. Long service life. Standing the test of tens of thousands opening/closing operations.

7. Flow curve tending to straight line. Excellent regulation performance.

conclusion

    The choice between Concentric & Eccentric Butterfly Valves depends on the specific requirements of the application. If the fluid is relatively clean and simple shut - off is the main concern, a concentric butterfly valve may be sufficient. But for applications dealing with dirty or slurry - filled fluids, an eccentric butterfly valve is usually a better option.

    If you have any needs regarding valves, please contact us and we will be happy to serve you.